Study of 225Ac-PSMA-617 in Men With PSMA-positive Prostate Cancer

NCT ID: NCT04597411

Last Updated: 2025-03-21

Basic Information

• Recruitment Status: RECRUITING
• Clinical Phase: PHASE1
• Total Enrollment: 99 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2021-04-01
• Study Completion Date: 2027-01-01

Brief Summary

This is a Phase 1, open-label, international, dose escalation study to evaluate the safety of [225Ac]Ac-PSMA-617 (225Ac-PSMA-617) in men with PSMA-positive prostate cancer who have and have not had prior exposure to [177Lu]Lu-PSMA-617 (177Lu-PSMA-617) or [177Lu]Lu-PSMA I&T (177Lu-PSMA I&T).

Detailed Description

Total duration of study participation of each participant is approximately 18-24 months (12 months from enrollment to end of each treatment (EOT) plus 12 months of long-term follow up (LTFU). The total duration of the study, from first patient in (FPI) to last LTFU will be approximately 48 months.

A minimum of 3 patients will be treated in each patient group at each dose level and evaluated for the occurrence of dose-limiting toxicity (DLT) during the first 6 weeks of treatment before consideration will be given to enrolling patients into the next dose level. Dose modifications for toxicity are allowed and defined per protocol.

No more than 6 cycles of 225Ac-PSMA-617 will be administered. Patients may receive less than 6 cycles if they have disease progression, intolerable toxicity, started other anticancer therapy, or have withdrawn from treatment per participant or physician decision.

Participants may also receive supportive care therapy, as determined by the study physician, however, participants cannot receive concurrent investigational agents, cytotoxic chemotherapy, biological agents, targeted therapy, immunotherapy, other systemic radioisotopes, and hemi-body radiotherapy until completion of treatment with 225Ac-PSMA-617.

Conditions

Prostatic Neoplasms, Castration-Resistant

Study Design

• Allocation Method: NON_RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: NONE

Study Groups

Group A (mCRPC who have received prior ARPI and chemotherapy, but are PSMA RLT naïve)

Men that have received prior cytotoxic chemotherapy and ARPI (e.g., abiraterone or enzalutamide), who HAVE NOT been previously treated with 177Lu-PSMA-617 radioligand therapy or 177Lu-PSMA I\&T will receive a dose of 225\^Ac-PSMA-617 via intravenous injection every 8 weeks (+/- 1 week) for a maximum of 6 cycles.

Group Type: EXPERIMENTAL

225^Ac-PSMA-617

Intervention Type: RADIATION

administered intravenously under the dose escalation schedule

68^Ga-PSMA-11

Intervention Type: RADIATION

administered intravenously at a dose of 111 - 185 MBq (3 - 5 mCi)

Group B (mCRPC who have not had prior ARPI or chemotherapy, and are PSMA RLT naïve)

Men previously treated with luteinizing hormone-releasing hormone (LHRH) agonists or orchiectomy and primary anti-androgen therapy that have not received prior cytotoxic chemotherapy or novel androgen axis drugs (e.g., abiraterone or enzalutamide) will receive a dose of 225Ac-PSMA-617 via intravenous injection every 8 weeks (+/- 1 week) for a maximum of 6 cycles.

Group Type: EXPERIMENTAL

225^Ac-PSMA-617

Intervention Type: RADIATION

administered intravenously under the dose escalation schedule

68^Ga-PSMA-11

Intervention Type: RADIATION

administered intravenously at a dose of 111 - 185 MBq (3 - 5 mCi)

Group C (mCRPC who have received prior PSMA RLT)

Men with progressive metastatic castration resistant prostate cancer (mCRPC) who HAVE been previously treated with 177Lu-PSMA-617 radioligand therapy or 177Lu-PSMA I\&T will receive a dose of 225Ac-PSMA-617 via intravenous injection every 8 weeks (+/- 1 week) for a maximum of 6 cycles. Prior chemotherapy and/or novel androgen axis drugs not required.

Group Type: EXPERIMENTAL

225^Ac-PSMA-617

Intervention Type: RADIATION

administered intravenously under the dose escalation schedule

68^Ga-PSMA-11

Intervention Type: RADIATION

administered intravenously at a dose of 111 - 185 MBq (3 - 5 mCi)

Interventions

225^Ac-PSMA-617

administered intravenously under the dose escalation schedule

Intervention Type: RADIATION

68^Ga-PSMA-11

administered intravenously at a dose of 111 - 185 MBq (3 - 5 mCi)

Intervention Type: RADIATION

Eligibility Criteria

Inclusion Criteria

• Patients must have the ability to understand and sign an approved ICF.
• Patients must have the ability to understand and comply with all protocol requirements.
• Patients must be >=18 years of age.
• Patients must have an ECOG performance status of 0 to 2.
• Patients must have had histological, pathological, and/or cytological confirmation of prostate cancer.
• Patients must have a positive 68Ga-PSMA-11 PET/CT scan performed within 28 days of study entry. If a patient also has soft tissue or visceral disease, it must be PSMA-positive on 68Ga-PSMA-11 PET/CT scan.
• Patients may not participate in the study if their baseline scan shows PSMA-negative disease (defined as disease that expresses PSMA at a level equal to or less than liver by visual assessment) in any of the following regions:

A) One or more PSMA negative lymph nodes >2.5 cm on short axis B) Bone metastasis with PSMA-negative soft tissues component > 1 cm in short axis

• Note that PSMA-negative osseous metastases without a soft tissue component >1 cm does not exclude the subject C) PSMA-negative solid organ metastases (i.e. lung, liver, adrenal glands, etc) that are PSMA-negative and ≥ 1cm in short axis
• Patients must have recovered or stabilized to =< Grade 2 or baseline from all clinically significant toxicities related to prior prostate cancer therapy.
• Determination of disease progression on treatment prior to enrollment. Progressive disease for study entry is defined as any one or more of the following:

1. PSA progression: minimum of two rising PSA values from a baseline measurement with an interval of >= 1 week between each measurement. 2.0 ng/mL is the minimal starting value if PSA rise is only indication of progression.

2. Soft tissue or visceral disease progression as per RECIST 1.1 criteria: increase >= 20% in the sum of the diameter (SOD) (short axis for nodal lesions and long axis for non-nodal lesions) of all target lesions based on the smallest SOD since treatment started or the appearance of one or more new lesions.

3. Bone progression: >= 2 new lesions on bone scan.

• Patients must have adequate organ function (bone morrow reserve, hepatic function and renal function).
• Known HIV-positive patients who are healthy and have a low risk of AIDS-related outcomes are eligible. HIV testing is required.
• For patients who have partners of childbearing potential, patient must use a method of birth control with adequate barrier protection, deemed acceptable by the principal investigator during the study and for 6 months after last study drug administration.
• Group A Subjects: Patients must have prior orchiectomy and/or ongoing androgen-deprivation therapy, a castrate level of serum testosterone (< 50 ng/dL or < 1.7 nmol/L) and must have received prior cytotoxic chemotherapy and a novel androgen axis drug (e.g., abiraterone or enzalutamide). Patients must also be naïve to prior 177Lu-PSMA radioligand therapy (177Lu-PSMA-617 or 177Lu-PSMA I&T)
• Group B Subjects (South-Africa only): Patients must have ongoing androgen deprivation therapy (ADT) and either prior orchiectomy or be medically castrate using LHRH agonists/antagonists in order to achieve adequate suppression of serum testosterone (< 50 ng/dL) but must not have received prior cytotoxic chemotherapy or novel androgen axis drugs (e.g., abiraterone or enzalutamide). These patients are naïve to 177Lu-PSMA radioligand therapy (177Lu-PSMA-617 or 177Lu-PSMA I&T).
• Group C Subjects: Patients must have ongoing androgen deprivation therapy (ADT) and either prior orchiectomy or be medically castrate using LHRH agonists/antagonists in order to achieve adequate suppression of serum testosterone (< 50 ng/dL). Patients must have been treated with prior 177Lu-PSMA radioligand therapy (177Lu-PSMA-617 or 177Lu-PSMA I&T) for at least one cycle administered greater than 6 weeks from study enrollment, and been evaluated for biochemical and radiological response to therapy. Prior exposure to ARPI and/or chemotherapy is not required.

Exclusion Criteria

• Previous treatment with Strontium-89, Samarium-153, Rhenium-186, Rhenium-188, Radium-223 or hemi-body irradiation.
• Any investigational agents within 28 days of study enrollment.
• Known hypersensitivity to the components of the study therapy or its analogues.
• Other concurrent cytotoxic chemotherapy, targeted therapy, biologic agents, immunotherapy, radioligand therapy, or investigational therapy.
• Transfusion for the sole purpose of eligibility into the study.
• Patients with a history of CNS metastases must have received therapy (surgery, radiotherapy, gamma knife) and be neurologically stable, asymptomatic, and not receiving corticosteroids for the purposes of maintaining neurologic integrity. Patients with epidural disease, canal disease and prior cord involvement are eligible if those areas have been treated, are stable, and not neurologically impaired.
• Symptomatic cord compression, or clinical or radiologic findings indicative of impending cord compression.
• Concurrent serious (as determined by the Principal Investigator) medical conditions, including, but not limited to, uncontrolled infection, active hepatitis B or C, or other significant co-morbid conditions that in the opinion of the investigator would impair study participation or cooperation.
• Diagnosed with other malignancies that are expected to alter life expectancy or may interfere with disease assessment. Patients with a prior history of malignancy who have been disease free for more than 3 years are eligible.
• Participants with an active documented COVID-19 infection (any grade of disease severity) at the time of informed consent may be included only when completely recovered (in accordance with local guidance).

• Minimum Eligible Age: 18 Years
• Eligible Sex: MALE
• Accepts Healthy Volunteers: No

Sponsors

Endocyte

INDUSTRY

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Novartis Pharmaceuticals

Role: STUDY_DIRECTOR

Novartis Pharmaceuticals

Locations

St. Vincent's Hospital Research Office-Translational Research Center

Darlinghurst, , Australia

Site Status: RECRUITING

Steve Biko Hospital-Department of Nuclear Medicine

Pretoria, , South Africa

Site Status: RECRUITING

Countries

Australia; South Africa

Central Contacts

Novartis Pharmaceuticals

Role: CONTACT

novartis.email@novartis.com

1-888-669-6682

Novartis Pharmaceuticals

Role: CONTACT

novartis.email@novartis.com

+41613241111

Other Identifiers

CAAA817A12101

Identifier Type: OTHER

Identifier Source: secondary_id

PSMA-617-100

Identifier Type: -

Identifier Source: org_study_id