Trial Outcomes & Findings for Study to Find a Safe Dose and Show Early Clinical Activity of Weekly Nab-paclitaxel in Pediatric Patients With Recurrent/ Refractory Solid Tumors (NCT NCT01962103)

NCT ID: NCT01962103

Last Updated: 2019-12-27

Results Overview

A DLT was defined as investigational product (IP)-related adverse events occurring during the DLT assessment period that led to treatment discontinuation or met one of the following criteria: - Common Terminology Criteria for Adverse Events (CTCAE) Grade (Gr) 3 or 4 nonhematologic toxicity (excluding transient transaminitis) - CTCAE Gr 3 or 4 nausea or vomiting that persisted \> 5 days despite maximal anti-emetic treatment - CTCAE Gr 4 thrombocytopenia or anemia that persisted \> 7 days or required transfusion \> 7 days - CTCAE Gr 3 thrombocytopenia with bleeding - CTCAE Gr 4 uncomplicated neutropenia lasting \> 7 days - Febrile neutropenia with confirmed bacterial infection - CTCAE Gr 3 hematologic toxicity requiring treatment (tx) delay \> 21 days. Use of "..." in the table rows signifies the continuation of row title per the above list.

Recruitment status

COMPLETED

Study phase

PHASE1/PHASE2

Target enrollment

107 participants

Primary outcome timeframe

DLT assessment period: For participants > 10 kg: the first 28-day cycle including Cycle 2 Day 1 predose evaluations; for participants ≤ 10 kg: the first two 28-day cycles including Cycle 3 Day 1 predose evaluations

Results posted on

2019-12-27

Participant Flow

Sixty-five participants were included in the Phase 1 enrolled population, and 64 enrolled partcipants received at least 1 dose of study drug and were included in the safety population, noted below. Forty-two participants were included in the Phase 2 enrolled and safety populations.

Participant milestones

Participant milestones
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 2: Ewing's Sarcoma Participants with Ewing's sarcoma: nab-paclitaxel at the RP2D (240 mg/m\^2 in participants weighing \> 10 kg and 11.5 mg/kg in participants weighing ≤ 10 kg) IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity.	Phase 2: Neuroblastoma Participants with neuroblastoma: nab-paclitaxel at the RP2D (240 mg/m\^2 in participants weighing \> 10 kg and 11.5 mg/kg in participants weighing ≤ 10 kg) IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity.	Phase 2: Rhabdomyosarcoma Participants with rhabdomyosarcoma: nab-paclitaxel at the RP2D (240 mg/m\^2 in participants weighing \> 10 kg and 11.5 mg/kg in participants weighing ≤ 10 kg) IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity.
Phase 1 STARTED	16	8	14	11	8	7	0	0	0
Phase 1 COMPLETED	0	0	0	0	0	0	0	0	0
Phase 1 NOT COMPLETED	16	8	14	11	8	7	0	0	0
Phase 2 STARTED	0	0	0	0	0	0	14	14	14
Phase 2 COMPLETED	0	0	0	0	0	0	0	0	0
Phase 2 NOT COMPLETED	0	0	0	0	0	0	14	14	14

Reasons for withdrawal

Reasons for withdrawal
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 2: Ewing's Sarcoma Participants with Ewing's sarcoma: nab-paclitaxel at the RP2D (240 mg/m\^2 in participants weighing \> 10 kg and 11.5 mg/kg in participants weighing ≤ 10 kg) IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity.	Phase 2: Neuroblastoma Participants with neuroblastoma: nab-paclitaxel at the RP2D (240 mg/m\^2 in participants weighing \> 10 kg and 11.5 mg/kg in participants weighing ≤ 10 kg) IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity.	Phase 2: Rhabdomyosarcoma Participants with rhabdomyosarcoma: nab-paclitaxel at the RP2D (240 mg/m\^2 in participants weighing \> 10 kg and 11.5 mg/kg in participants weighing ≤ 10 kg) IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity.
Phase 1 Adverse Event	4	0	2	1	2	2	0	0	0
Phase 1 Progressive Disease	8	6	8	4	5	4	0	0	0
Phase 1 Withdrawal by Subject	0	0	0	2	0	0	0	0	0
Phase 1 Withdrawal by Parent/Guardian	0	0	2	1	0	0	0	0	0
Phase 1 Physician Decision	0	0	0	1	0	0	0	0	0
Phase 1 Symptomatic Deterioration	3	2	2	2	1	1	0	0	0
Phase 1 Miscellaneous	1	0	0	0	0	0	0	0	0
Phase 2 Adverse Event	0	0	0	0	0	0	1	0	3
Phase 2 Progressive Disease	0	0	0	0	0	0	11	12	11
Phase 2 Symptomatic Deterioration	0	0	0	0	0	0	2	2	0

Baseline Characteristics

Study to Find a Safe Dose and Show Early Clinical Activity of Weekly Nab-paclitaxel in Pediatric Patients With Recurrent/ Refractory Solid Tumors

Baseline characteristics by cohort

Baseline characteristics by cohort
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=16 Participants nab-paclitaxel 120 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 150 mg/m^2 n=8 Participants nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 n=14 Participants nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 n=11 Participants nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 n=8 Participants nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 n=7 Participants nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 2: Ewing's Sarcoma n=14 Participants Participants with Ewing's sarcoma: nab-paclitaxel at the RP2D (240 mg/m\^2 in participants weighing \> 10 kg and 11.5 mg/kg in participants weighing ≤ 10 kg) IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity.	Phase 2: Neuroblastoma n=14 Participants Participants with neuroblastoma: nab-paclitaxel at the RP2D (240 mg/m\^2 in participants weighing \> 10 kg and 11.5 mg/kg in participants weighing ≤ 10 kg) IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity.	Phase 2: Rhabdomyosarcoma n=14 Participants Participants with rhabdomyosarcoma: nab-paclitaxel at the RP2D (240 mg/m\^2 in participants weighing \> 10 kg and 11.5 mg/kg in participants weighing ≤ 10 kg) IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity.	Total n=106 Participants Total of all reporting groups
Age, Continuous	11.7 years STANDARD_DEVIATION 3.32 • n=5 Participants	12.1 years STANDARD_DEVIATION 5.84 • n=7 Participants	10.2 years STANDARD_DEVIATION 4.64 • n=5 Participants	10.2 years STANDARD_DEVIATION 5.36 • n=4 Participants	11.6 years STANDARD_DEVIATION 4.63 • n=21 Participants	12.1 years STANDARD_DEVIATION 2.97 • n=10 Participants	10.1 years STANDARD_DEVIATION 4.63 • n=115 Participants	7.1 years STANDARD_DEVIATION 3.42 • n=24 Participants	12.4 years STANDARD_DEVIATION 6.42 • n=42 Participants	10.7 years STANDARD_DEVIATION 4.81 • n=42 Participants
Sex: Female, Male Female	9 Participants n=5 Participants	4 Participants n=7 Participants	9 Participants n=5 Participants	7 Participants n=4 Participants	1 Participants n=21 Participants	3 Participants n=10 Participants	6 Participants n=115 Participants	5 Participants n=24 Participants	9 Participants n=42 Participants	53 Participants n=42 Participants
Sex: Female, Male Male	7 Participants n=5 Participants	4 Participants n=7 Participants	5 Participants n=5 Participants	4 Participants n=4 Participants	7 Participants n=21 Participants	4 Participants n=10 Participants	8 Participants n=115 Participants	9 Participants n=24 Participants	5 Participants n=42 Participants	53 Participants n=42 Participants
Ethnicity (NIH/OMB) Hispanic or Latino	2 Participants n=5 Participants	3 Participants n=7 Participants	1 Participants n=5 Participants	1 Participants n=4 Participants	3 Participants n=21 Participants	0 Participants n=10 Participants	0 Participants n=115 Participants	2 Participants n=24 Participants	5 Participants n=42 Participants	17 Participants n=42 Participants
Ethnicity (NIH/OMB) Not Hispanic or Latino	6 Participants n=5 Participants	5 Participants n=7 Participants	7 Participants n=5 Participants	10 Participants n=4 Participants	5 Participants n=21 Participants	5 Participants n=10 Participants	11 Participants n=115 Participants	8 Participants n=24 Participants	8 Participants n=42 Participants	65 Participants n=42 Participants
Ethnicity (NIH/OMB) Unknown or Not Reported	8 Participants n=5 Participants	0 Participants n=7 Participants	6 Participants n=5 Participants	0 Participants n=4 Participants	0 Participants n=21 Participants	2 Participants n=10 Participants	3 Participants n=115 Participants	4 Participants n=24 Participants	1 Participants n=42 Participants	24 Participants n=42 Participants
Race/Ethnicity, Customized White	11 Participants n=5 Participants	8 Participants n=7 Participants	9 Participants n=5 Participants	9 Participants n=4 Participants	8 Participants n=21 Participants	5 Participants n=10 Participants	11 Participants n=115 Participants	11 Participants n=24 Participants	12 Participants n=42 Participants	84 Participants n=42 Participants
Race/Ethnicity, Customized Not Collected or Reported	5 Participants n=5 Participants	0 Participants n=7 Participants	5 Participants n=5 Participants	0 Participants n=4 Participants	0 Participants n=21 Participants	1 Participants n=10 Participants	3 Participants n=115 Participants	3 Participants n=24 Participants	1 Participants n=42 Participants	18 Participants n=42 Participants
Race/Ethnicity, Customized Other, Not Specified	0 Participants n=5 Participants	0 Participants n=7 Participants	0 Participants n=5 Participants	2 Participants n=4 Participants	0 Participants n=21 Participants	1 Participants n=10 Participants	0 Participants n=115 Participants	0 Participants n=24 Participants	0 Participants n=42 Participants	3 Participants n=42 Participants
Race/Ethnicity, Customized Black or African American	0 Participants n=5 Participants	0 Participants n=7 Participants	0 Participants n=5 Participants	0 Participants n=4 Participants	0 Participants n=21 Participants	0 Participants n=10 Participants	0 Participants n=115 Participants	0 Participants n=24 Participants	1 Participants n=42 Participants	1 Participants n=42 Participants
Participants With Any Prior Cancer Treatment Any Prior Cancer Treatment	16 Participants n=5 Participants	8 Participants n=7 Participants	14 Participants n=5 Participants	11 Participants n=4 Participants	8 Participants n=21 Participants	7 Participants n=10 Participants	14 Participants n=115 Participants	14 Participants n=24 Participants	14 Participants n=42 Participants	106 Participants n=42 Participants
Participants With Any Prior Cancer Treatment Prior Radiation Therapy	9 Participants n=5 Participants	4 Participants n=7 Participants	11 Participants n=5 Participants	7 Participants n=4 Participants	6 Participants n=21 Participants	6 Participants n=10 Participants	12 Participants n=115 Participants	10 Participants n=24 Participants	10 Participants n=42 Participants	75 Participants n=42 Participants
Participants With Any Prior Cancer Treatment Prior Cancer Surgeries	14 Participants n=5 Participants	7 Participants n=7 Participants	9 Participants n=5 Participants	9 Participants n=4 Participants	5 Participants n=21 Participants	7 Participants n=10 Participants	10 Participants n=115 Participants	11 Participants n=24 Participants	6 Participants n=42 Participants	78 Participants n=42 Participants
Participants With Any Prior Cancer Treatment Prior Systemic Anticancer Therapy	16 Participants n=5 Participants	8 Participants n=7 Participants	14 Participants n=5 Participants	11 Participants n=4 Participants	8 Participants n=21 Participants	7 Participants n=10 Participants	14 Participants n=115 Participants	14 Participants n=24 Participants	14 Participants n=42 Participants	106 Participants n=42 Participants
Participants With Any Prior Cancer Treatment Prior Systemic Anticancer Regimens	16 Participants n=5 Participants	8 Participants n=7 Participants	14 Participants n=5 Participants	11 Participants n=4 Participants	8 Participants n=21 Participants	7 Participants n=10 Participants	14 Participants n=115 Participants	14 Participants n=24 Participants	14 Participants n=42 Participants	106 Participants n=42 Participants
Participants With Any Prior Cancer Treatment Prior Stem Cell Transplants	2 Participants n=5 Participants	2 Participants n=7 Participants	3 Participants n=5 Participants	2 Participants n=4 Participants	3 Participants n=21 Participants	2 Participants n=10 Participants	3 Participants n=115 Participants	10 Participants n=24 Participants	0 Participants n=42 Participants	27 Participants n=42 Participants
Participants With Any Prior Cancer Treatment Other Prior Anticancer Therapies	2 Participants n=5 Participants	0 Participants n=7 Participants	1 Participants n=5 Participants	3 Participants n=4 Participants	2 Participants n=21 Participants	0 Participants n=10 Participants	1 Participants n=115 Participants	6 Participants n=24 Participants	0 Participants n=42 Participants	15 Participants n=42 Participants
Number of Prior Systemic Anticancer Regimens Received	3.69 systemic anticancer regimens STANDARD_DEVIATION 1.815 • n=5 Participants	3.25 systemic anticancer regimens STANDARD_DEVIATION 1.832 • n=7 Participants	3.64 systemic anticancer regimens STANDARD_DEVIATION 1.946 • n=5 Participants	3.64 systemic anticancer regimens STANDARD_DEVIATION 2.461 • n=4 Participants	3.00 systemic anticancer regimens STANDARD_DEVIATION 1.309 • n=21 Participants	3.00 systemic anticancer regimens STANDARD_DEVIATION 0.816 • n=10 Participants	2.50 systemic anticancer regimens STANDARD_DEVIATION 0.519 • n=115 Participants	2.14 systemic anticancer regimens STANDARD_DEVIATION 0.663 • n=24 Participants	2.21 systemic anticancer regimens STANDARD_DEVIATION 0.579 • n=42 Participants	2.99 systemic anticancer regimens STANDARD_DEVIATION 1.552 • n=42 Participants

PRIMARY outcome

Timeframe: DLT assessment period: For participants > 10 kg: the first 28-day cycle including Cycle 2 Day 1 predose evaluations; for participants ≤ 10 kg: the first two 28-day cycles including Cycle 3 Day 1 predose evaluations

Population: Dose Determining Set (DDS): all Phase 1 participants who received all 3 weekly doses of nab-paclitaxel at the cohort planned dose during Cycle 1 and had adequate safety assessments during the DLT assessment period or experienced a DLT. The DDS did not include participants who were enrolled at each dose once the dose had been determined to be safe.

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=6 Participants nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 n=6 Participants nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 n=6 Participants nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 n=6 Participants nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 n=6 Participants nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 n=7 Participants nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 1: Number of Participants With Dose Limiting Toxicities (DLTs) At least 1 DLT	1 Participants	0 Participants	0 Participants	0 Participants	0 Participants	1 Participants
Phase 1: Number of Participants With Dose Limiting Toxicities (DLTs) Gr 3/4 Nonhematologic Toxicity...	1 Participants	0 Participants	0 Participants	0 Participants	0 Participants	0 Participants
Phase 1: Number of Participants With Dose Limiting Toxicities (DLTs) Gr 3/4 Nausea or Vomiting Persisting >5 days...	0 Participants	0 Participants	0 Participants	0 Participants	0 Participants	0 Participants
Phase 1: Number of Participants With Dose Limiting Toxicities (DLTs) Gr 4 Thrombocytopenia/Anemia Persisting >7 days...	0 Participants	0 Participants	0 Participants	0 Participants	0 Participants	0 Participants
Phase 1: Number of Participants With Dose Limiting Toxicities (DLTs) Gr 3 Thrombocytopenia with Bleeding	0 Participants	0 Participants	0 Participants	0 Participants	0 Participants	0 Participants
Phase 1: Number of Participants With Dose Limiting Toxicities (DLTs) Gr 4 Uncomplicated Neutropenia Lasting >7 days	0 Participants	0 Participants	0 Participants	0 Participants	0 Participants	1 Participants
Phase 1: Number of Participants With Dose Limiting Toxicities (DLTs) Febrile Neutropenia+Confirmed Bacterial Infection	0 Participants	0 Participants	0 Participants	0 Participants	0 Participants	0 Participants
Phase 1: Number of Participants With Dose Limiting Toxicities (DLTs) Gr3 Hematologic Toxicity Requiring Tx Delay...	0 Participants	0 Participants	0 Participants	0 Participants	0 Participants	0 Participants

PRIMARY outcome

Timeframe: Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Participants were followed for 28 days after discontinuing treatment for safety and monitoring of AEs.

Population: Safety Population: all participants who took at least 1 dose of study drug.

An adverse event (AE) was defined as any noxious, unintended, or untoward medical occurrence that may appear or worsen in a participant during the course of a study. A serious AE (SAE) is any AE occurring at any dose that: results in death; is life-threatening; requires inpatient hospitalization or prolongation of existing hospitalization; results in persistent or significant disability/incapacity; is a congenital anomaly/birth defect; constitutes an important medical event. TEAEs were defined as AEs that began or worsened in severity on or after the date of the first dose of study drug and within 28 days of the date of the last dose of study drug. The severity of an AE was graded according to the CTCAE, Version 4.0.

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=16 Participants nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 n=8 Participants nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 n=14 Participants nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 n=11 Participants nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 n=8 Participants nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 n=7 Participants nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 1: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) TEAE	16 Participants	8 Participants	14 Participants	11 Participants	8 Participants	7 Participants
Phase 1: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) Treatment-related (TR) TEAE	14 Participants	8 Participants	12 Participants	11 Participants	7 Participants	7 Participants
Phase 1: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) Grade 3 or 4 TEAE	13 Participants	8 Participants	10 Participants	10 Participants	8 Participants	7 Participants
Phase 1: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) TR Grade 3 or 4 TEAE	9 Participants	7 Participants	7 Participants	9 Participants	7 Participants	7 Participants
Phase 1: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) Serious TEAE	10 Participants	7 Participants	6 Participants	5 Participants	3 Participants	4 Participants
Phase 1: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) TR Serious TEAE	1 Participants	4 Participants	4 Participants	2 Participants	1 Participants	3 Participants
Phase 1: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) TEAE Leading to Drug Discontinuation	4 Participants	0 Participants	2 Participants	1 Participants	2 Participants	2 Participants
Phase 1: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) TR TEAE Leading to Drug Discontinuation	1 Participants	0 Participants	0 Participants	1 Participants	2 Participants	2 Participants
Phase 1: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) TEAE Leading to Dose Reduction	0 Participants	1 Participants	2 Participants	1 Participants	3 Participants	3 Participants
Phase 1: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) TR TEAE Leading to Dose Reduction	0 Participants	1 Participants	2 Participants	1 Participants	3 Participants	3 Participants
Phase 1: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) TEAE Leading to Drug Interruption	2 Participants	2 Participants	3 Participants	4 Participants	3 Participants	2 Participants
Phase 1: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) TR TEAE Leading to Drug Interruption	0 Participants	2 Participants	1 Participants	3 Participants	3 Participants	2 Participants
Phase 1: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) TEAE Leading to Death	2 Participants	1 Participants	0 Participants	0 Participants	1 Participants	1 Participants
Phase 1: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) TR TEAE Leading to Death	0 Participants	0 Participants	0 Participants	0 Participants	0 Participants	0 Participants

PRIMARY outcome

Timeframe: Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), Rhabdomyosarcoma = 5 weeks (1-13).

Population: Efficacy Evaluable Population: participants who met eligibility criteria for Phase 2, completed at least 1 dose of study drug, and had baseline and at least 1 postbaseline efficacy assessment if having not discontinued the investigational product prior to postbaseline efficacy assessment due to disease progression or systematic deterioration.

Overall response rate was defined as the percentage of participants who achieved a complete response (CR; disappearance of all target lesions) or partial response (PR; at least a 30% decrease in the sum of diameters of target lesions) confirmed no less than 4 weeks after the criteria for response were first met using Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1 guidelines. (For Phase 2 neuroblastoma participants who had both RECIST and Curie Score tumor evaluations, both tumor response results were considered and an overall response was derived.) Confidence interval was obtained using the Clopper-Pearson method.

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=13 Participants nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 n=14 Participants nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 n=14 Participants nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 2: Overall Response Rate (ORR)	0 percentage of participants Interval 0.0 to 24.7	0 percentage of participants Interval 0.0 to 23.2	7.1 percentage of participants Interval 0.2 to 33.9	—	—	—

SECONDARY outcome

Timeframe: Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively.

Population: Efficacy Evaluable Population: participants who met eligibility criteria for Phase 1, completed at least 1 dose of study drug, and had baseline and at least 1 postbaseline efficacy assessment if having not discontinued the investigational product prior to postbaseline efficacy assessment due to disease progression or systematic deterioration.

Overall response rate was defined as the percentage of participants who achieved a complete response (CR; disappearance of all target lesions) or partial response (PR: at least a 30% decrease in the sum of diameters of target lesions) confirmed no less than 4 weeks after the criteria for response were first met) using RECIST version 1.1 guidelines over the total number of participants available for the analysis. Confidence interval was obtained using the Clopper-Pearson method.

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=14 Participants nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 n=8 Participants nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 n=12 Participants nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 n=10 Participants nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 n=8 Participants nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 n=7 Participants nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 1: ORR	0 percentage of participants Interval 0.0 to 23.2	0 percentage of participants Interval 0.0 to 36.9	0 percentage of participants Interval 0.0 to 26.5	0 percentage of participants Interval 0.0 to 30.8	12.5 percentage of participants Interval 0.3 to 52.7	14.3 percentage of participants Interval 0.4 to 57.9

SECONDARY outcome

Timeframe: Cycle 1 Day 1 (Participants ≥ 6 years: 1-2 minutes prior to the end of infusion [EOI], and 15 minutes, 1, 3, 5, 8, 24, 48, and 72 hours after the EOI. Participants <6 years: 1-2 minutes prior to the EOI, and 15 minutes, 3, 5, and 24 hours after the EOI.)

Population: Pharmacokinetic (PK) population: all participannts who received at least one dose of nab-paclitaxel and had evaluable concentration data.

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=13 Participants nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 n=7 Participants nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 n=12 Participants nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 n=9 Participants nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 n=7 Participants nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 n=6 Participants nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 1: Maximum Observed Concentration of Paclitaxel in Blood Plasma (Cmax)	3488 ng/mL Geometric Coefficient of Variation 73.7	5468 ng/mL Geometric Coefficient of Variation 38.0	5597 ng/mL Geometric Coefficient of Variation 33.4	5616 ng/mL Geometric Coefficient of Variation 63.9	7831 ng/mL Geometric Coefficient of Variation 23.1	8078 ng/mL Geometric Coefficient of Variation 41.5

SECONDARY outcome

Population: PK population: all participants who received at least one dose of nab-paclitaxel and had evaluable concentration data.

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=13 Participants nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 n=7 Participants nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 n=12 Participants nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 n=9 Participants nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 n=7 Participants nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 n=6 Participants nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 1: Cmax - Dose-Normalized	23.3 ng/mL/[mg] Geometric Coefficient of Variation 87.5	25.4 ng/mL/[mg] Geometric Coefficient of Variation 46.6	27.3 ng/mL/[mg] Geometric Coefficient of Variation 47.3	23.2 ng/mL/[mg] Geometric Coefficient of Variation 80.3	28.2 ng/mL/[mg] Geometric Coefficient of Variation 48.7	21.0 ng/mL/[mg] Geometric Coefficient of Variation 46.6

SECONDARY outcome

Population: PK population: all participants who received at least one dose of nab-paclitaxel and had evaluable concentration data for given measure.

Measurements include: AUC from time zero to the last measurable concentration (AUCt), AUC from time zero to 24 hours (AUC24), and AUC from time zero to infinity (AUCinf).

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=13 Participants nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 n=7 Participants nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 n=12 Participants nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 n=9 Participants nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 n=7 Participants nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 n=6 Participants nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 1: Area Under the Plasma Concentration-Time Curve (AUC) AUCt	7844 ng*h/mL Geometric Coefficient of Variation 73.4	10374 ng*h/mL Geometric Coefficient of Variation 91.8	9690 ng*h/mL Geometric Coefficient of Variation 37.1	11817 ng*h/mL Geometric Coefficient of Variation 64.0	12706 ng*h/mL Geometric Coefficient of Variation 29.2	11245 ng*h/mL Geometric Coefficient of Variation 22.6
Phase 1: Area Under the Plasma Concentration-Time Curve (AUC) AUC24	6392 ng*h/mL Geometric Coefficient of Variation 79.0	8944 ng*h/mL Geometric Coefficient of Variation 85.9	8365 ng*h/mL Geometric Coefficient of Variation 37.7	10932 ng*h/mL Geometric Coefficient of Variation 66.3	11167 ng*h/mL Geometric Coefficient of Variation 27.4	9768 ng*h/mL Geometric Coefficient of Variation 20.7
Phase 1: Area Under the Plasma Concentration-Time Curve (AUC) AUCinf	8867 ng*h/mL Geometric Coefficient of Variation 85.4	11992 ng*h/mL Geometric Coefficient of Variation 99.8	10087 ng*h/mL Geometric Coefficient of Variation 38.4	14361 ng*h/mL Geometric Coefficient of Variation 72.1	14242 ng*h/mL Geometric Coefficient of Variation 29.2	12424 ng*h/mL Geometric Coefficient of Variation 28.5

SECONDARY outcome

Population: PK population: all participants who received at least one dose of nab-paclitaxel and had evaluable concentration data for given measure.

Measurements include: AUC24 and AUCinf.

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=13 Participants nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 n=7 Participants nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 n=12 Participants nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 n=8 Participants nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 n=7 Participants nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 n=6 Participants nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 1: AUC - Dose-Normalized AUC24	42.7 ng*h/mL/[mg] Geometric Coefficient of Variation 77.4	41.6 ng*h/mL/[mg] Geometric Coefficient of Variation 87.0	40.8 ng*h/mL/[mg] Geometric Coefficient of Variation 39.7	43.3 ng*h/mL/[mg] Geometric Coefficient of Variation 63.6	40.2 ng*h/mL/[mg] Geometric Coefficient of Variation 65.4	25.4 ng*h/mL/[mg] Geometric Coefficient of Variation 26.1
Phase 1: AUC - Dose-Normalized AUCinf	62.0 ng*h/mL/[mg] Geometric Coefficient of Variation 75.7	49.2 ng*h/mL/[mg] Geometric Coefficient of Variation 101	47.8 ng*h/mL/[mg] Geometric Coefficient of Variation 39.8	64.8 ng*h/mL/[mg] Geometric Coefficient of Variation 25.4	52.3 ng*h/mL/[mg] Geometric Coefficient of Variation 67.4	31.3 ng*h/mL/[mg] Geometric Coefficient of Variation 34.9

SECONDARY outcome

Population: PK population: all participants who received at least one dose of nab-paclitaxel and had evaluable concentration data.

Measurement of renal clearance from the body.

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=9 Participants nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 n=6 Participants nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 n=10 Participants nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 n=6 Participants nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 n=6 Participants nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 n=5 Participants nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 1: Clearance (CL)	16.1 L/h Geometric Coefficient of Variation 75.6	20.3 L/h Geometric Coefficient of Variation 101	20.9 L/h Geometric Coefficient of Variation 39.9	15.4 L/h Geometric Coefficient of Variation 25.4	19.1 L/h Geometric Coefficient of Variation 67.4	31.9 L/h Geometric Coefficient of Variation 35.0

SECONDARY outcome

Population: PK population: all participants who received at least one dose of nab-paclitaxel and had evaluable concentration data.

Measurement of renal clearance from the body.

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=9 Participants nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 n=6 Participants nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 n=10 Participants nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 n=6 Participants nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 n=6 Participants nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 n=5 Participants nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 1: CL - Body Surface Area (BSA)-Normalized	13.5 L/h/m^2 Geometric Coefficient of Variation 85.1	12.5 L/h/m^2 Geometric Coefficient of Variation 99.3	17.8 L/h/m^2 Geometric Coefficient of Variation 38.3	14.6 L/h/m^2 Geometric Coefficient of Variation 72.3	16.7 L/h/m^2 Geometric Coefficient of Variation 29.2	21.8 L/h/m^2 Geometric Coefficient of Variation 28.4

SECONDARY outcome

Population: PK population: all participants who received at least one dose of nab-paclitaxel and had evaluable concentration data.

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=9 Participants nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 n=6 Participants nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 n=10 Participants nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 n=6 Participants nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 n=6 Participants nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 n=5 Participants nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 1: Volume of Distribution (Vss)	127 liters Geometric Coefficient of Variation 145	266 liters Geometric Coefficient of Variation 78.3	146 liters Geometric Coefficient of Variation 106	89.8 liters Geometric Coefficient of Variation 45.1	175 liters Geometric Coefficient of Variation 117	446 liters Geometric Coefficient of Variation 17.6

SECONDARY outcome

Population: PK population: all participants who received at least one dose of nab-paclitaxel and had evaluable concentration data.

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=9 Participants nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 n=6 Participants nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 n=10 Participants nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 n=6 Participants nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 n=6 Participants nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 n=5 Participants nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 1: Vss - BSA-Normalized	106 L/m^2 Geometric Coefficient of Variation 95.3	164 L/m^2 Geometric Coefficient of Variation 78.4	124 L/m^2 Geometric Coefficient of Variation 82.8	84.9 L/m^2 Geometric Coefficient of Variation 49.7	154 L/m^2 Geometric Coefficient of Variation 56.5	304 L/m^2 Geometric Coefficient of Variation 29.0

SECONDARY outcome

Timeframe: Cycle 1 Day 1 (Participants ≥ 6 years: 1-2 minutes prior to the end of infusion [EOI], and 15 minutes, 1, 3, 5, 8, 24, 48, and 72 hours after the EOI. Participants < 6 years: 1-2 minutes prior to the EOI, and 15 minutes, 3, 5, and 24 hours after the EOI.)

Population: PK population: all participants who received at least one dose of nab-paclitaxel and had evaluable concentration data.

Population PK analysis was performed using nonlinear mixed effect modeling. The estimated allometric function for V1 was 0.888.

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=106 Participants nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 1 and 2 Population PK: Volume of Distribution of the Central Compartment (V1)	11.8 liters	—	—	—	—	—

SECONDARY outcome

Timeframe: Cycle 1 Day 1 (Participants ≥ 6 years: 1-2 minutes prior to the end of infusion [EOI], and 15 minutes, 1, 3, 5, 8, 24, 48, and 72 hours after the EOI. Participants < 6 years: 1-2 minutes prior to the EOI, and 15 minutes, 3, 5, and 24 hours after the EOI.)

Population: PK population: all participants who received at least one dose of nab-paclitaxel and had evaluable concentration data

Population PK analysis was performed using nonlinear mixed effect modeling. The estimated allometric function for VMEL was 1.12.

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=106 Participants nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 1 and 2 Population PK: Maximum Elimination Rate From the Central Compartment (VMEL)	31983 μg/h	—	—	—	—	—

SECONDARY outcome

Timeframe: Cycle 1 Day 1 (Participants ≥ 6 years: 1-2 minutes prior to the end of infusion [EOI], and 15 minutes, 1, 3, 5, 8, 24, 48, and 72 hours after the EOI. Participants < 6 years: 1-2 minutes prior to the EOI, and 15 minutes, 3, 5, and 24 hours after the EOI.)

Population: PK population: all participants who received at least one dose of nab-paclitaxel and had evaluable concentration data

Population PK analysis was performed using nonlinear mixed effect modeling.

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=106 Participants nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 1 and 2 Population PK: Concentration in the Central Compartment at 50% of VMEL (KMEL)	951 μg/L	—	—	—	—	—

SECONDARY outcome

Timeframe: Cycle 1 Day 1 (Participants ≥ 6 years: 1-2 minutes prior to the end of infusion [EOI], and 15 minutes, 1, 3, 5, 8, 24, 48, and 72 hours after the EOI. Participants < 6 years: 1-2 minutes prior to the EOI, and 15 minutes, 3, 5, and 24 hours after the EOI.)

Population: PK population: all participants who received at least one dose of nab-paclitaxel and had evaluable concentration data.

Population PK analysis was performed using nonlinear mixed effect modeling. The estimated allometric function for Q2 was 1.12.

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=106 Participants nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 1 and 2 Population PK: Intercompartmental CL Between the Central Compartment and the First Peripheral Compartment (Q2)	22.4 L/h	—	—	—	—	—

SECONDARY outcome

Timeframe: Cycle 1 Day 1 (Participants ≥ 6 years: 1-2 minutes prior to the end of infusion [EOI], and 15 minutes, 1, 3, 5, 8, 24, 48, and 72 hours after the EOI. Participants < 6 years: 1-2 minutes prior to the EOI, and 15 minutes, 3, 5, and 24 hours after the EOI.)

Population: PK population: all participants who received at least one dose of nab-paclitaxel and had evaluable concentration data.

Population PK analysis was performed using nonlinear mixed effect modeling. The estimated allometric function for Q3 was 1.12.

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=106 Participants nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 1 and 2 Population PK: Intercompartmental CL Between the Central Compartment and the Second Peripheral Compartment (Q3)	34.8 L/h	—	—	—	—	—

SECONDARY outcome

Timeframe: Cycle 1 Day 1 (Participants ≥ 6 years: 1-2 minutes prior to the end of infusion [EOI], and 15 minutes, 1, 3, 5, 8, 24, 48, and 72 hours after the EOI. Participants < 6 years: 1-2 minutes prior to the EOI, and 15 minutes, 3, 5, and 24 hours after the EOI.)

Population: PK population: all participants who received at least one dose of nab-paclitaxel and had evaluable concentration data.

Population PK analysis was performed using nonlinear mixed effect modeling. The estimated allometric function for V2 was 0.888.

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=106 Participants nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 1 and 2 Population PK: Volume of Distribution of the First Peripheral Compartment (V2)	545 liters	—	—	—	—	—

SECONDARY outcome

Timeframe: Cycle 1 Day 1 (Participants ≥ 6 years: 1-2 minutes prior to the end of infusion [EOI], and 15 minutes, 1, 3, 5, 8, 24, 48, and 72 hours after the EOI. Participants < 6 years: 1-2 minutes prior to the EOI, and 15 minutes, 3, 5, and 24 hours after the EOI.)

Population: PK population: all participants who received at least one dose of nab-paclitaxel and had evaluable concentration data.

Population PK analysis was performed using nonlinear mixed effect modeling. The estimated allometric function for V3 was 0.888.

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=106 Participants nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 1 and 2 Population PK: Volume of Distribution of the Second Peripheral Compartment (V3)	45.3 liters	—	—	—	—	—

SECONDARY outcome

Timeframe: Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), Rhabdomyosarcoma = 5 weeks (1-13). Participants were followed until disease progression (if applicable) up to a maximum of 100.3 weeks.

Population: Efficacy Evaluable Population: participants (with response) who met eligibility criteria for Phase 2, completed ≥ 1 dose of study drug, and had baseline and ≥ 1 postbaseline efficacy assessment if having not discontinued the investigational product prior to postbaseline efficacy assessment due to disease progression or systematic deterioration.

Duration of response was defined as the time from the date of the first response (CR/PR, using RECIST version 1.1 guidelines) to disease progression for participants with a confirmed CR or PR. Participants who did not have disease progression or had not died were censored at the time of their last disease assessment or at time of start of new anticancer therapy, whichever occurred first. (For Phase 2 neuroblastoma patients who had both RECIST version 1.1 and Curie Score tumor evaluations, both tumor responses results were considered and an overall response was derived.)

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 n=1 Participants nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 2: Duration of Response (DOR)	—	—	6.14 weeks Interval 6.14 to 6.14	—	—	—

SECONDARY outcome

Timeframe: Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), Rhabdomyosarcoma = 5 weeks (1-13).

Disease control rate was defined as the percentage of participants who achieved either a stable disease maintained for ≥ 16 weeks or confirmed CR (confirmed no less than 4 weeks after criteria for response were first met) or confirmed PR (confirmed no less than 4 weeks after criteria for response were first met) over the total number of participants available for the analysis. Confidence interval was obtained using the Clopper-Pearson method.

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=13 Participants nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 n=14 Participants nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 n=14 Participants nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 2: Disease Control Rate (DCR)	30.8 percentage of participants Interval 9.1 to 61.4	7.1 percentage of participants Interval 0.2 to 33.9	7.1 percentage of participants Interval 0.2 to 33.9	—	—	—

SECONDARY outcome

PFS was defined as the time from the first dose date to the start of disease progression or participant death (any cause), whichever occurred first. Disease progression was classed as either a disease progression observed as a response assessment, or a disease progression or symptomatic deterioration at treatment/study discontinuation. Participants who did not have disease progression or had not died were censored at the last known time that the participant was progression free. Disease progression was considered according to RECIST version 1.1 for Phase 2 Ewing's sarcoma and rhabdomyosarcoma participants. (For Phase 2 neuroblastoma participants who had both RECIST 1.1 and Curie score tumor evaluations, both tumor responses results were considered and an overall response was derived.) Median PFS time was estimated through Kaplan-Meier methods. 95% confidence interval about the median time to PFS event was obtained using Greenwood's method.

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=13 Participants nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 n=14 Participants nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 n=14 Participants nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 2: Progression-Free Survival (PFS)	13 weeks Interval 7.4 to 16.1	7.4 weeks Interval 4.6 to 8.1	5.1 weeks Interval 2.1 to 7.9	—	—	—

SECONDARY outcome

Timeframe: 1 year

Population: Efficacy Evaluable Population: participants who met eligibility criteria for Phase 2, completed ≥1 dose of study drug, and had baseline and ≥1 postbaseline efficacy assessment if having not discontinued the investigational product prior to postbaseline efficacy assessment due to disease progression or systematic deterioration.

Overall survival was defined as the time from the first dose date to date of death (any cause). Participants who were alive were censored at the last known time that the participant was alive.

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=13 Participants nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 n=14 Participants nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 n=14 Participants nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 2: Kaplan-Meier Estimate of Overall Survival Rate at 1 Year	48 percentage of participants Interval 14.0 to 76.0	25 percentage of participants Interval 4.0 to 54.0	15 percentage of participants Interval 2.0 to 39.0	—	—	—

SECONDARY outcome

Timeframe: Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), Rhabdomyosarcoma = 5 weeks (1-13). Participants were followed for 28 days after discontinuing treatment for safety and monitoring of AEs.

Population: Safety Population: all participants who took at least 1 dose of study drug.

An AE was defined as any noxious, unintended, or untoward medical occurrence that may appear or worsen in a participant during the course of a study. A SAE is any AE occurring at any dose that: results in death; is life-threatening; requires inpatient hospitalization or prolongation of existing hospitalization; results in persistent or significant disability/incapacity; is a congenital anomaly/birth defect; constitutes an important medical event. TEAEs were defined as AEs that began or worsened in severity on or after the date of the first dose of study drug and within 28 days of the date of the last dose of study drug. The severity of the AEs was graded according to the Common Terminology Criteria for Adverse Events, Version 4.0. Participants were followed for 28 days after discontinuing treatment for safety and monitoring of AEs.

Outcome measures

Outcome measures
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=14 Participants nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 n=14 Participants nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 n=14 Participants nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.
Phase 2: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) TEAE	14 Participants	14 Participants	14 Participants	—	—	—
Phase 2: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) Treatment-related (TR) TEAE	13 Participants	12 Participants	12 Participants	—	—	—
Phase 2: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) Grade 3 or 4 TEAE	12 Participants	13 Participants	12 Participants	—	—	—
Phase 2: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) TR Grade 3 or 4 TEAE	9 Participants	9 Participants	10 Participants	—	—	—
Phase 2: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) Serious TEAE	6 Participants	6 Participants	11 Participants	—	—	—
Phase 2: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) TR Serious TEAE	2 Participants	2 Participants	6 Participants	—	—	—
Phase 2: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) TEAE Leading to Drug Discontinuation	3 Participants	1 Participants	3 Participants	—	—	—
Phase 2: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) TR TEAE Leading to Drug Discontinuation	1 Participants	0 Participants	3 Participants	—	—	—
Phase 2: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) TEAE Leading to Dose Reduction	4 Participants	5 Participants	4 Participants	—	—	—
Phase 2: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) TR TEAE Leading to Dose Reduction	4 Participants	4 Participants	4 Participants	—	—	—
Phase 2: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) TEAE Leading to Drug Interruption	5 Participants	3 Participants	4 Participants	—	—	—
Phase 2: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) TR TEAE Leading to Drug Interruption	3 Participants	3 Participants	2 Participants	—	—	—
Phase 2: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) TEAE Leading to Death	0 Participants	2 Participants	3 Participants	—	—	—
Phase 2: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) TR TEAE Leading to Death	0 Participants	0 Participants	0 Participants	—	—	—

Adverse Events

Phase 1: Nab-Paclitaxel 120 mg/m^2

Serious events: 10 serious events

Other events: 16 other events

Deaths: 14 deaths

Phase 1: Nab-Paclitaxel 150 mg/m^2

Serious events: 7 serious events

Other events: 8 other events

Deaths: 7 deaths

Phase 1: Nab-Paclitaxel 180 mg/m^2

Serious events: 6 serious events

Other events: 14 other events

Deaths: 11 deaths

Phase 1: Nab-Paclitaxel 210 mg/m^2

Serious events: 5 serious events

Other events: 11 other events

Deaths: 5 deaths

Phase 1: Nab-Paclitaxel 240 mg/m^2

Serious events: 3 serious events

Other events: 8 other events

Deaths: 8 deaths

Phase 1: Nab-Paclitaxel 270 mg/m^2

Serious events: 4 serious events

Other events: 7 other events

Deaths: 5 deaths

Phase 2: Nab-Paclitaxel 240 mg/m^2

Serious events: 23 serious events

Other events: 42 other events

Deaths: 25 deaths

Serious adverse events

Serious adverse events
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=16 participants at risk nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 n=8 participants at risk nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 n=14 participants at risk nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 n=11 participants at risk nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 n=8 participants at risk nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 n=7 participants at risk nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 2: Nab-Paclitaxel 240 mg/m^2 n=42 participants at risk Participants with Ewing's sarcoma, neuroblastoma, or rhabdomyosarcoma: nab-paclitaxel at the RP2D (240 mg/m\^2 in participants weighing \> 10 kg and 11.5 mg/kg in participants weighing ≤ 10 kg) IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity.
Blood and lymphatic system disorders Febrile neutropenia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.5% 4/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Blood and lymphatic system disorders Leukopenia	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Blood and lymphatic system disorders Neutropenia	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Blood and lymphatic system disorders Thrombocytopenia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	4.8% 2/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Cardiac disorders Tachycardia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Abdominal pain	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Diarrhoea	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Nausea	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Vomiting	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
General disorders Chills	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
General disorders General physical health deterioration	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.5% 4/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
General disorders Generalised oedema	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
General disorders Oedema peripheral	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
General disorders Pyrexia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	37.5% 3/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 2/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	27.3% 3/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	28.6% 2/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 6/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Cellulitis	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Device related infection	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Gastroenteritis	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Lower respiratory tract infection bacterial	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Pneumonia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Soft tissue infection	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Staphylococcal bacteraemia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Varicella	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Injury, poisoning and procedural complications Anaphylactic transfusion reaction	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Dehydration	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Hypercreatininaemia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Hyponatraemia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Musculoskeletal and connective tissue disorders Back pain	12.5% 2/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Musculoskeletal and connective tissue disorders Bone pain	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Musculoskeletal and connective tissue disorders Pain in extremity	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Neoplasms benign, malignant and unspecified (incl cysts and polyps) Cancer pain	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Neoplasms benign, malignant and unspecified (incl cysts and polyps) Osteosarcoma	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Neoplasms benign, malignant and unspecified (incl cysts and polyps) Osteosarcoma metastatic	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Neoplasms benign, malignant and unspecified (incl cysts and polyps) Refractory anaemia with an excess of blasts	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Neoplasms benign, malignant and unspecified (incl cysts and polyps) Tumour pain	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Nervous system disorders Dizziness	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Nervous system disorders Headache	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	4.8% 2/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Nervous system disorders Intracranial pressure increased	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Nervous system disorders Seizure	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Nervous system disorders Slow speech	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Nervous system disorders Somnolence	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Nervous system disorders Tremor	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Psychiatric disorders Restlessness	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Renal and urinary disorders Acute kidney injury	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	4.8% 2/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Renal and urinary disorders Anuria	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Renal and urinary disorders Urinary retention	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Renal and urinary disorders Urinary tract obstruction	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Dyspnoea	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Hypoxia	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Pleural effusion	12.5% 2/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Pneumonitis	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Pneumothorax	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	4.8% 2/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Pulmonary embolism	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Respiratory failure	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Dermatitis acneiform	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Dermatitis bullous	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Erythema	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Skin exfoliation	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Vascular disorders Hypertension	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Vascular disorders Hypotension	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.

Other adverse events

Other adverse events
Measure	Phase 1: Nab-Paclitaxel 120 mg/m^2 n=16 participants at risk nab-paclitaxel 120 mg/m\^2 intravenously (IV) on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the recommended phase 2 dose (RP2D).	Phase 1: Nab-Paclitaxel 150 mg/m^2 n=8 participants at risk nab-paclitaxel 150 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 180 mg/m^2 n=14 participants at risk nab-paclitaxel 180 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 210 mg/m^2 n=11 participants at risk nab-paclitaxel 210 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 240 mg/m^2 n=8 participants at risk nab-paclitaxel 240 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 1: Nab-Paclitaxel 270 mg/m^2 n=7 participants at risk nab-paclitaxel 270 mg/m\^2 IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity to establish the RP2D.	Phase 2: Nab-Paclitaxel 240 mg/m^2 n=42 participants at risk Participants with Ewing's sarcoma, neuroblastoma, or rhabdomyosarcoma: nab-paclitaxel at the RP2D (240 mg/m\^2 in participants weighing \> 10 kg and 11.5 mg/kg in participants weighing ≤ 10 kg) IV on Days 1, 8 and 15 of a 28-day cycle until disease progression, death, withdrawal of consent, or unacceptable toxicity.
Blood and lymphatic system disorders Anaemia	50.0% 8/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	75.0% 6/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	42.9% 6/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	45.5% 5/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	75.0% 6/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	85.7% 6/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	64.3% 27/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Blood and lymphatic system disorders Febrile neutropenia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Blood and lymphatic system disorders Leukopenia	37.5% 6/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 2/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	45.5% 5/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	62.5% 5/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	42.9% 3/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	42.9% 18/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Blood and lymphatic system disorders Lymphadenitis	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Blood and lymphatic system disorders Lymphopenia	37.5% 6/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	18.2% 2/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	42.9% 3/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	11.9% 5/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Blood and lymphatic system disorders Neutropenia	43.8% 7/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	50.0% 4/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	42.9% 6/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	72.7% 8/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	87.5% 7/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	85.7% 6/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	54.8% 23/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Blood and lymphatic system disorders Neutrophilia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Blood and lymphatic system disorders Thrombocytopenia	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 2/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	57.1% 4/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	19.0% 8/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Blood and lymphatic system disorders Thrombocytosis	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Cardiac disorders Aortic valve disease	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Cardiac disorders Palpitations	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Cardiac disorders Pericardial effusion	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Cardiac disorders Sinus bradycardia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Cardiac disorders Sinus tachycardia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Congenital, familial and genetic disorders Hydrocele	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Ear and labyrinth disorders Ear pain	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 3/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Ear and labyrinth disorders Ear swelling	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Ear and labyrinth disorders Vertigo	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Endocrine disorders Cushingoid	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Eye disorders Diplopia	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Eye disorders Dry eye	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Eye disorders Eye irritation	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Eye disorders Eye pain	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Eye disorders Eye pruritus	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Eye disorders Keratitis	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Eye disorders Lacrimation increased	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Eye disorders Periorbital oedema	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	18.2% 2/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 3/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Eye disorders Photophobia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Eye disorders Vision blurred	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	11.9% 5/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Abdominal distension	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Abdominal pain	12.5% 2/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	21.4% 3/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	18.2% 2/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	37.5% 3/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	28.6% 2/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 6/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Abdominal pain upper	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 2/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Anal fissure	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	4.8% 2/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Anal incontinence	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Anal inflammation	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Anorectal discomfort	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Ascites	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Constipation	25.0% 4/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	37.5% 3/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	21.4% 3/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	54.5% 6/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	23.8% 10/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Diarrhoea	12.5% 2/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	50.0% 4/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	28.6% 4/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	27.3% 3/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	50.0% 4/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	28.6% 2/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	19.0% 8/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Diarrhoea haemorrhagic	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Dyspepsia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	4.8% 2/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Eructation	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Flatulence	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 2/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Gastrointestinal pain	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Gastrooesophageal reflux disease	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Haematochezia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Haemorrhoids	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Nausea	37.5% 6/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	37.5% 3/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 2/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	36.4% 4/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	42.9% 3/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	23.8% 10/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Odynophagia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Salivary hypersecretion	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Stomatitis	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	18.2% 2/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	28.6% 2/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	19.0% 8/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Toothache	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	4.8% 2/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Gastrointestinal disorders Vomiting	50.0% 8/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	37.5% 3/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 2/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	27.3% 3/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	37.5% 3/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	33.3% 14/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
General disorders Asthenia	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	37.5% 3/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	21.4% 9/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
General disorders Catheter site pain	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
General disorders Face oedema	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	4.8% 2/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
General disorders Fatigue	18.8% 3/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	37.5% 3/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	28.6% 4/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	36.4% 4/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	4.8% 2/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
General disorders General physical health deterioration	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
General disorders Generalised oedema	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
General disorders Influenza like illness	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
General disorders Malaise	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
General disorders Non-cardiac chest pain	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
General disorders Oedema peripheral	18.8% 3/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	37.5% 3/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 2/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	19.0% 8/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
General disorders Pain	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
General disorders Pyrexia	37.5% 6/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	37.5% 3/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	35.7% 5/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	45.5% 5/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	50.0% 4/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	28.6% 2/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	33.3% 14/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
General disorders Xerosis	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Hepatobiliary disorders Hyperbilirubinaemia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Bacillus bacteraemia	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Cellulitis	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Clostridium difficile infection	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Conjunctivitis	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Cystitis	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Device related infection	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 2/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Ear infection	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Herpes zoster	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Infection	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Lung infection	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Mucosal infection	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Oral candidiasis	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Oropharyngeal candidiasis	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Otitis externa	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Otitis media	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Paronychia	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Rash pustular	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Rhinitis	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 2/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Skin infection	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Upper respiratory tract infection	12.5% 2/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Urinary tract infection	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	4.8% 2/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Infections and infestations Vulvitis	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Injury, poisoning and procedural complications Arthropod bite	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Injury, poisoning and procedural complications Contusion	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Injury, poisoning and procedural complications Excoriation	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Injury, poisoning and procedural complications Fall	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Injury, poisoning and procedural complications Humerus fracture	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Injury, poisoning and procedural complications Muscle injury	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Injury, poisoning and procedural complications Recall phenomenon	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Injury, poisoning and procedural complications Scar	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Injury, poisoning and procedural complications Vascular access complication	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Injury, poisoning and procedural complications Wound secretion	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Investigations Activated partial thromboplastin time prolonged	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Investigations Alanine aminotransferase increased	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	37.5% 3/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	27.3% 3/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	4.8% 2/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Investigations Aspartate aminotransferase increased	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 3/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Investigations Blood alkaline phosphatase increased	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	50.0% 4/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Investigations Blood bicarbonate decreased	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Investigations Blood bilirubin increased	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Investigations Blood creatinine increased	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Investigations Blood lactate dehydrogenase increased	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Investigations Blood urea increased	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Investigations C-reactive protein increased	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	18.2% 2/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Investigations Candida test positive	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Investigations Electrocardiogram QT prolonged	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Investigations Electroencephalogram abnormal	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Investigations Gamma-glutamyltransferase increased	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Investigations Glucose urine present	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Investigations International normalised ratio increased	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Investigations Neutrophil count decreased	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Investigations Platelet count decreased	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Investigations Urine output decreased	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Investigations Weight decreased	12.5% 2/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	28.6% 2/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Investigations Weight increased	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Acidosis	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Cachexia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Decreased appetite	18.8% 3/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	37.5% 3/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	35.7% 5/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 6/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Dehydration	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Hyperchloraemia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Hypercreatininaemia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Hyperglycaemia	12.5% 2/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Hyperkalaemia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Hypermagnesaemia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Hypernatraemia	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Hyperphosphataemia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Hypertriglyceridaemia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Hypoalbuminaemia	12.5% 2/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	37.5% 3/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	4.8% 2/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Hypocalcaemia	12.5% 2/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Hypochloraemia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Hypoglycaemia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Hypokalaemia	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	37.5% 3/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 2/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	28.6% 2/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	11.9% 5/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Hypomagnesaemia	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	4.8% 2/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Hyponatraemia	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	50.0% 4/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Hypophosphataemia	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Metabolism and nutrition disorders Polydipsia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Musculoskeletal and connective tissue disorders Arthralgia	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	36.4% 4/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	28.6% 2/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 3/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Musculoskeletal and connective tissue disorders Back pain	12.5% 2/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	21.4% 3/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Musculoskeletal and connective tissue disorders Bone pain	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Musculoskeletal and connective tissue disorders Coccydynia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Musculoskeletal and connective tissue disorders Epiphysiolysis	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Musculoskeletal and connective tissue disorders Flank pain	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Musculoskeletal and connective tissue disorders Groin pain	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Musculoskeletal and connective tissue disorders Joint swelling	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Musculoskeletal and connective tissue disorders Muscular weakness	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Musculoskeletal and connective tissue disorders Musculoskeletal chest pain	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Musculoskeletal and connective tissue disorders Musculoskeletal pain	12.5% 2/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Musculoskeletal and connective tissue disorders Myalgia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	50.0% 4/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Musculoskeletal and connective tissue disorders Neck pain	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Musculoskeletal and connective tissue disorders Pain in extremity	12.5% 2/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	37.5% 3/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 2/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	37.5% 3/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	40.5% 17/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Musculoskeletal and connective tissue disorders Pain in jaw	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Musculoskeletal and connective tissue disorders Spinal pain	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Neoplasms benign, malignant and unspecified (incl cysts and polyps) Cancer pain	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 2/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Neoplasms benign, malignant and unspecified (incl cysts and polyps) Skin papilloma	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Neoplasms benign, malignant and unspecified (incl cysts and polyps) Tumour haemorrhage	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Neoplasms benign, malignant and unspecified (incl cysts and polyps) Tumour pain	12.5% 2/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 3/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Nervous system disorders Depressed level of consciousness	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Nervous system disorders Dizziness	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	4.8% 2/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Nervous system disorders Dysaesthesia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Nervous system disorders Dysgeusia	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Nervous system disorders Headache	18.8% 3/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	21.4% 3/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	18.2% 2/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	26.2% 11/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Nervous system disorders Lethargy	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Nervous system disorders Neuralgia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 3/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Nervous system disorders Neuropathy peripheral	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Nervous system disorders Paraesthesia	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Nervous system disorders Peripheral motor neuropathy	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Nervous system disorders Peripheral sensory neuropathy	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 2/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	37.5% 3/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	28.6% 2/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 3/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Nervous system disorders Posterior reversible encephalopathy syndrome	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Nervous system disorders Sciatica	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Nervous system disorders Somnolence	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Nervous system disorders Spinal cord compression	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Nervous system disorders Visual field defect	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Psychiatric disorders Anxiety	12.5% 2/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	37.5% 3/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Psychiatric disorders Confusional state	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Psychiatric disorders Depression	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Psychiatric disorders Enuresis	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Psychiatric disorders Insomnia	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	18.2% 2/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	4.8% 2/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Psychiatric disorders Mood altered	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Psychiatric disorders Restlessness	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Renal and urinary disorders Acute kidney injury	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Renal and urinary disorders Dysuria	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	4.8% 2/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Renal and urinary disorders Haematuria	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Renal and urinary disorders Ketonuria	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Renal and urinary disorders Pollakiuria	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Renal and urinary disorders Polyuria	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Renal and urinary disorders Renal pain	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Renal and urinary disorders Urinary incontinence	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Renal and urinary disorders Urinary retention	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Renal and urinary disorders Urinary tract obstruction	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Renal and urinary disorders Urinary tract pain	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Reproductive system and breast disorders Genital pain	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Reproductive system and breast disorders Menstruation irregular	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Reproductive system and breast disorders Oedema genital	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Reproductive system and breast disorders Scrotal oedema	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Reproductive system and breast disorders Vaginal haemorrhage	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Reproductive system and breast disorders Vulvovaginal discomfort	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Atelectasis	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Cough	12.5% 2/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	37.5% 3/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 2/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	36.4% 4/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	37.5% 3/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 6/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Dysaesthesia pharynx	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Dysphonia	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Dyspnoea	18.8% 3/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 2/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	4.8% 2/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Epistaxis	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	28.6% 2/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	11.9% 5/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Haemoptysis	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Hypoxia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Lung consolidation	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Nasal congestion	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Oropharyngeal pain	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Pharyngeal erythema	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Pharyngeal inflammation	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Pleural effusion	12.5% 2/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Productive cough	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Pulmonary haemorrhage	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Rhinitis allergic	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Tachypnoea	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Respiratory, thoracic and mediastinal disorders Wheezing	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Alopecia	12.5% 2/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	50.0% 4/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	28.6% 4/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	45.5% 5/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	37.5% 3/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	28.6% 2/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 6/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Dermatitis	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Dermatitis acneiform	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Dermatitis atopic	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Dry skin	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	18.2% 2/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	28.6% 2/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	4.8% 2/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Ecchymosis	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Erythema	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	18.2% 2/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	16.7% 7/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Haemorrhage subcutaneous	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Intertrigo	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Nail bed inflammation	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Nail discolouration	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Onychoclasis	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Onycholysis	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Pain of skin	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	28.6% 2/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Palmar-plantar erythrodysaesthesia syndrome	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	4.8% 2/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Photosensitivity reaction	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 3/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Pruritus	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	4.8% 2/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Pruritus generalised	18.8% 3/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	28.6% 2/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	11.9% 5/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Rash	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Rash erythematous	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Rash macular	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Rash maculo-papular	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	16.7% 7/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Rash papular	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Skin exfoliation	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 1/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	4.8% 2/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Skin hyperpigmentation	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	25.0% 2/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Skin and subcutaneous tissue disorders Toxic erythema of chemotherapy	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 1/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Vascular disorders Hyperaemia	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	7.1% 3/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Vascular disorders Hypertension	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	2.4% 1/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Vascular disorders Hypotension	0.00% 0/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	12.5% 1/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	14.3% 2/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.
Vascular disorders Lymphoedema	6.2% 1/16 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/14 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	9.1% 1/11 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/8 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/7 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.	0.00% 0/42 • Median treatment duration in Phase 1 was 7.0 weeks, with minimum and maximum duration of 1 and 49 weeks, respectively. Median treatment duration in Phase 2 per group: Ewings Sarcoma = 14 weeks (3-31), Neuroblastoma = 7 weeks (3-23), rhabdomyosarcoma = 5 weeks (1-13). All participants in both portions of the study were followed for 28 days after discontinuing treatment for safety and monitoring of AEs. AE's were analyzed in terms of TEAEs, which were defined as any AEs that began or worsened in severity on or after the start of study drug through 28 days after the last dose of study drug.

Additional Information

Anne McClain, Senior Manager

Celgene Corporation

Phone: 888-260-1599

Email: [email protected]

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