Trial Outcomes & Findings for A Study of PSMA ADC in Subjects With Metastatic Castration-resistant Prostate Cancer (mCRPC) (NCT NCT01695044)

NCT ID: NCT01695044

Last Updated: 2017-03-24

Results Overview

Total serum prostate-specific antigen (PSA) response was defined as any decrease from baseline of at least 30% or 50%.

Recruitment status

COMPLETED

Study phase

PHASE2

Target enrollment

119 participants

Primary outcome timeframe

24 Weeks

Results posted on

2017-03-24

Participant Flow

Participant milestones

Participant milestones
Measure
Arm 1: PSMA ADC
PSMA ADC administered IV at 2.5 mg/kg Q3W for 8 cycles or 2.3 mg/kg Q3W for 8 cycles.
Overall Study
STARTED
119
Overall Study
COMPLETED
17
Overall Study
NOT COMPLETED
102

Reasons for withdrawal

Withdrawal data not reported

Baseline Characteristics

A Study of PSMA ADC in Subjects With Metastatic Castration-resistant Prostate Cancer (mCRPC)

Baseline characteristics by cohort

Baseline characteristics by cohort
Measure
Arm 1: PSMA ADC Chemotherapy-experienced
n=84 Participants
PSMA ADC administered IV at 2.5 mg/kg Q3W for 8 cycles or 2.3 mg/kg Q3W for 8 cycles.
Arm 2: PSMA ADC Chemotherapy-naive
n=35 Participants
PSMA ADC administered IV at 2.3 mg/kg Q3W for 8 cycles.
Total
n=119 Participants
Total of all reporting groups
Age, Continuous
70.7 years
n=5 Participants
73.1 years
n=7 Participants
71.4 years
n=5 Participants
Sex: Female, Male
Female
0 Participants
n=5 Participants
0 Participants
n=7 Participants
0 Participants
n=5 Participants
Sex: Female, Male
Male
84 Participants
n=5 Participants
35 Participants
n=7 Participants
119 Participants
n=5 Participants
Prostate specific antigen (PSA)
804.8 ug/mL
STANDARD_DEVIATION 2173.38 • n=5 Participants
220.9 ug/mL
STANDARD_DEVIATION 438.35 • n=7 Participants
633.1 ug/mL
STANDARD_DEVIATION 1857.2 • n=5 Participants
PSA
188.9 ug/mL
n=5 Participants
94.1 ug/mL
n=7 Participants
162.9 ug/mL
n=5 Participants

PRIMARY outcome

Timeframe: 24 Weeks

Population: Both groups must also have received and progressed on abiraterone acetate and/or enzalutamide prior to the study (once these agents were commercially available for use). The population examined was those subjects with a PSA baseline value and at least one post-baseline value.

Total serum prostate-specific antigen (PSA) response was defined as any decrease from baseline of at least 30% or 50%.

Outcome measures

Outcome measures
Measure
PSMA ADC Chemotherapy-experienced
n=79 Participants
Prostate Specific Membrane Antigen Antibody Drug Conjugate (PSMA ADC) administered IV at 2.3 mg/kg Q3W for 8 cycles. The chemotherapy-experienced group was comprised of 84 subjects who must have received at least one taxane-containing chemotherapy regimen (e.g., docetaxel, cabazitaxel) prior to the study (more than two cytotoxic chemotherapy regimens required sponsor approval for study participation).
Chemotherapy-naive
n=34 Participants
Prostate Specific Membrane Antigen Antibody Drug Conjugate (PSMA ADC) administered IV at 2.3 mg/kg Q3W for 8 cycles. The chemotherapy-naïve group was comprised of 35 subjects who were cytotoxic chemotherapy-naïve. Chemotherapy-naïve subjects must have received and progressed on Radium-223 (following its approval by FDA), or have been ineligible for it, refused it, had an intolerance to it, or did not have access to it.
Percentage of Participants With Total Serum PSA Response
>50% Decrease in PSA
11 % of responders
21 % of responders
Percentage of Participants With Total Serum PSA Response
>30% Decrease in PSA
29 % of responders
32 % of responders

PRIMARY outcome

Timeframe: 24 Weeks

Population: Both groups must also have received and progressed on abiraterone acetate and/or enzalutamide prior to the study (once these agents were commercially available for use). The population examined was those subjects with a CTC baseline value and at least one post-baseline value.

Circulating tumor cells (CTC) response was examined at two levels: at least 30% decrease or at least 50% decrease in CTC levels. Response was defined as any decrease from baseline of at least 30% or 50%.

Outcome measures

Outcome measures
Measure
PSMA ADC Chemotherapy-experienced
n=68 Participants
Prostate Specific Membrane Antigen Antibody Drug Conjugate (PSMA ADC) administered IV at 2.3 mg/kg Q3W for 8 cycles. The chemotherapy-experienced group was comprised of 84 subjects who must have received at least one taxane-containing chemotherapy regimen (e.g., docetaxel, cabazitaxel) prior to the study (more than two cytotoxic chemotherapy regimens required sponsor approval for study participation).
Chemotherapy-naive
n=26 Participants
Prostate Specific Membrane Antigen Antibody Drug Conjugate (PSMA ADC) administered IV at 2.3 mg/kg Q3W for 8 cycles. The chemotherapy-naïve group was comprised of 35 subjects who were cytotoxic chemotherapy-naïve. Chemotherapy-naïve subjects must have received and progressed on Radium-223 (following its approval by FDA), or have been ineligible for it, refused it, had an intolerance to it, or did not have access to it.
CTC Response
>30% Decrease in CTC
81 % of responders
92 % of responders
CTC Response
>50% Decrease in CTC
74 % of responders
85 % of responders

PRIMARY outcome

Timeframe: 24 weeks

Population: Both groups must also have received and progressed on abiraterone acetate and/or enzalutamide prior to the study (once these agents were commercially available for use). The full modified Intention-to-Treat (mITT) population (n = 119) was examined.

Overall radiologic response was measured prior to the first dose of study drug, at predose of cycle 5, and at the end of study. Imaging techniques used at screening were used throughout the study. The preferred imaging techniques include: bone scan, contrast enhanced CT of chest, contrast enhanced CT of pelvis, and contrast enhanced CT of upper \& lower abdomen. Best overall radiologic response (confirmed), target and non-target lesions, was defined as responses in bone, visceral or nodal metastases according to the Modified Response Evaluation Criteria (RECIST 1.1). The best overall radiologic response is the best response recorded from the start of the treatment until disease progression/recurrence (taking, as reference for progressive disease, the smallest measurements recorded since the treatment started). The subject's best response assignment depended on the achievement of both measurement and confirmation criteria.

Outcome measures

Outcome measures
Measure
PSMA ADC Chemotherapy-experienced
n=84 Participants
Prostate Specific Membrane Antigen Antibody Drug Conjugate (PSMA ADC) administered IV at 2.3 mg/kg Q3W for 8 cycles. The chemotherapy-experienced group was comprised of 84 subjects who must have received at least one taxane-containing chemotherapy regimen (e.g., docetaxel, cabazitaxel) prior to the study (more than two cytotoxic chemotherapy regimens required sponsor approval for study participation).
Chemotherapy-naive
n=35 Participants
Prostate Specific Membrane Antigen Antibody Drug Conjugate (PSMA ADC) administered IV at 2.3 mg/kg Q3W for 8 cycles. The chemotherapy-naïve group was comprised of 35 subjects who were cytotoxic chemotherapy-naïve. Chemotherapy-naïve subjects must have received and progressed on Radium-223 (following its approval by FDA), or have been ineligible for it, refused it, had an intolerance to it, or did not have access to it.
Overall Radiologic Response
Partial response
0 % of subjects
6 % of subjects
Overall Radiologic Response
Progressive disease
13 % of subjects
9 % of subjects
Overall Radiologic Response
Stable disease
61 % of subjects
69 % of subjects
Overall Radiologic Response
Non-evaluable
26 % of subjects
17 % of subjects

Adverse Events

PSMA ADC Chemotherapy-experienced

Serious events: 43 serious events
Other events: 84 other events
Deaths: 0 deaths

Chemotherapy-naive

Serious events: 18 serious events
Other events: 35 other events
Deaths: 0 deaths

Serious adverse events

Serious adverse events
Measure
PSMA ADC Chemotherapy-experienced
n=84 participants at risk
PSMA ADC administered IV at 2.3 mg/kg Q3W for 8 cycles. The chemotherapy-experienced group was comprised of 84 subjects who must have received at least one taxane-containing chemotherapy regimen (e.g., docetaxel, cabazitaxel) prior to the study (more than two cytotoxic chemotherapy regimens required sponsor approval for study participation).
Chemotherapy-naive
n=35 participants at risk
PSMA ADC administered IV at 2.3 mg/kg Q3W for 8 cycles. The chemotherapy-naïve group was comprised of 35 subjects who were cytotoxic chemotherapy-naïve. Chemotherapy-naïve subjects must have received and progressed on Radium-223 (following its approval by FDA), or have been ineligible for it, refused it, had an intolerance to it, or did not have access to it.
Blood and lymphatic system disorders
Anemia
4.8%
4/84 • 24 weeks
0.00%
0/35 • 24 weeks
Blood and lymphatic system disorders
Febrile neutropenia
2.4%
2/84 • 24 weeks
8.6%
3/35 • 24 weeks
Blood and lymphatic system disorders
Neutropenia
2.4%
2/84 • 24 weeks
0.00%
0/35 • 24 weeks
Blood and lymphatic system disorders
Hemorrhagic anemia
1.2%
1/84 • 24 weeks
0.00%
0/35 • 24 weeks
Cardiac disorders
Sinus tachycardia
2.4%
2/84 • 24 weeks
0.00%
0/35 • 24 weeks
Gastrointestinal disorders
Abdominal pain
3.6%
3/84 • 24 weeks
0.00%
0/35 • 24 weeks
Gastrointestinal disorders
Constipation
2.4%
2/84 • 24 weeks
5.7%
2/35 • 24 weeks
Gastrointestinal disorders
Ileus
2.4%
2/84 • 24 weeks
2.9%
1/35 • 24 weeks
General disorders
Asthenia
3.6%
3/84 • 24 weeks
0.00%
0/35 • 24 weeks
General disorders
Fatigue
3.6%
3/84 • 24 weeks
2.9%
1/35 • 24 weeks
General disorders
Non-cardiac chest pain
2.4%
2/84 • 24 weeks
0.00%
0/35 • 24 weeks
Infections and infestations
Bacteremia
2.4%
2/84 • 24 weeks
0.00%
0/35 • 24 weeks
Infections and infestations
Lobar pneumonia
2.4%
2/84 • 24 weeks
0.00%
0/35 • 24 weeks
Infections and infestations
Pneumonia
3.6%
3/84 • 24 weeks
0.00%
0/35 • 24 weeks
Infections and infestations
Sepsis
2.4%
2/84 • 24 weeks
2.9%
1/35 • 24 weeks
Investigations
ECG QT prolonged
2.4%
2/84 • 24 weeks
0.00%
0/35 • 24 weeks
Investigations
Decreased neutrophil count
3.6%
3/84 • 24 weeks
0.00%
0/35 • 24 weeks
Metabolism and nutrition disorders
Dehydration
3.6%
3/84 • 24 weeks
14.3%
5/35 • 24 weeks
Metabolism and nutrition disorders
Hyponatremia
3.6%
3/84 • 24 weeks
5.7%
2/35 • 24 weeks
Metabolism and nutrition disorders
Hypophosphatemia
2.4%
2/84 • 24 weeks
2.9%
1/35 • 24 weeks
Musculoskeletal and connective tissue disorders
Back pain
2.4%
2/84 • 24 weeks
0.00%
0/35 • 24 weeks
Musculoskeletal and connective tissue disorders
Bone pain
3.6%
3/84 • 24 weeks
0.00%
0/35 • 24 weeks
Musculoskeletal and connective tissue disorders
Muscular weakness
3.6%
3/84 • 24 weeks
0.00%
0/35 • 24 weeks
Nervous system disorders
Transient ischemic attack
0.00%
0/84 • 24 weeks
5.7%
2/35 • 24 weeks
Renal and urinary disorders
Hematuria
1.2%
1/84 • 24 weeks
5.7%
2/35 • 24 weeks
Renal and urinary disorders
Acute renal failure
1.2%
1/84 • 24 weeks
5.7%
2/35 • 24 weeks
Respiratory, thoracic and mediastinal disorders
Dyspnea
4.8%
4/84 • 24 weeks
0.00%
0/35 • 24 weeks
Vascular disorders
Deep vein thrombosis
1.2%
1/84 • 24 weeks
5.7%
2/35 • 24 weeks

Other adverse events

Other adverse events
Measure
PSMA ADC Chemotherapy-experienced
n=84 participants at risk
PSMA ADC administered IV at 2.3 mg/kg Q3W for 8 cycles. The chemotherapy-experienced group was comprised of 84 subjects who must have received at least one taxane-containing chemotherapy regimen (e.g., docetaxel, cabazitaxel) prior to the study (more than two cytotoxic chemotherapy regimens required sponsor approval for study participation).
Chemotherapy-naive
n=35 participants at risk
PSMA ADC administered IV at 2.3 mg/kg Q3W for 8 cycles. The chemotherapy-naïve group was comprised of 35 subjects who were cytotoxic chemotherapy-naïve. Chemotherapy-naïve subjects must have received and progressed on Radium-223 (following its approval by FDA), or have been ineligible for it, refused it, had an intolerance to it, or did not have access to it.
Blood and lymphatic system disorders
Anemia
29.8%
25/84 • 24 weeks
20.0%
7/35 • 24 weeks
Blood and lymphatic system disorders
Febrile neutropenia
2.4%
2/84 • 24 weeks
8.6%
3/35 • 24 weeks
Blood and lymphatic system disorders
Leukopenia
3.6%
3/84 • 24 weeks
5.7%
2/35 • 24 weeks
Blood and lymphatic system disorders
Neutropenia
19.0%
16/84 • 24 weeks
17.1%
6/35 • 24 weeks
Cardiac disorders
Tachycardia
2.4%
2/84 • 24 weeks
5.7%
2/35 • 24 weeks
Cardiac disorders
Vertigo
3.6%
3/84 • 24 weeks
5.7%
2/35 • 24 weeks
Eye disorders
Vision blurred
0.00%
0/84 • 24 weeks
5.7%
2/35 • 24 weeks
Gastrointestinal disorders
Nausea
48.8%
41/84 • 24 weeks
65.7%
23/35 • 24 weeks
Gastrointestinal disorders
Diarrhea
39.3%
33/84 • 24 weeks
45.7%
16/35 • 24 weeks
Gastrointestinal disorders
Constipation
35.7%
30/84 • 24 weeks
34.3%
12/35 • 24 weeks
Gastrointestinal disorders
Vomiting
26.2%
22/84 • 24 weeks
34.3%
12/35 • 24 weeks
Gastrointestinal disorders
Abdominal pain
17.9%
15/84 • 24 weeks
14.3%
5/35 • 24 weeks
Gastrointestinal disorders
Dyspepsia
8.3%
7/84 • 24 weeks
17.1%
6/35 • 24 weeks
Gastrointestinal disorders
Abdominal pain upper
6.0%
5/84 • 24 weeks
0.00%
0/35 • 24 weeks
Gastrointestinal disorders
Dysphagia
3.6%
3/84 • 24 weeks
5.7%
2/35 • 24 weeks
Gastrointestinal disorders
Flatulence
4.8%
4/84 • 24 weeks
5.7%
2/35 • 24 weeks
Gastrointestinal disorders
Gastroesophageal reflux disease
9.5%
8/84 • 24 weeks
2.9%
1/35 • 24 weeks
General disorders
Fatigue
61.9%
52/84 • 24 weeks
54.3%
19/35 • 24 weeks
General disorders
Peripheral edema
21.4%
18/84 • 24 weeks
11.4%
4/35 • 24 weeks
General disorders
Asthenia
15.5%
13/84 • 24 weeks
8.6%
3/35 • 24 weeks
General disorders
Pain
10.7%
9/84 • 24 weeks
8.6%
3/35 • 24 weeks
General disorders
Chills
4.8%
4/84 • 24 weeks
5.7%
2/35 • 24 weeks
General disorders
Gait disturbance
6.0%
5/84 • 24 weeks
5.7%
2/35 • 24 weeks
General disorders
Pyrexia
7.1%
6/84 • 24 weeks
5.7%
2/35 • 24 weeks
Infections and infestations
Urinary tract infection
10.7%
9/84 • 24 weeks
11.4%
4/35 • 24 weeks
Infections and infestations
Upper resiratory tract infection
2.4%
2/84 • 24 weeks
5.7%
2/35 • 24 weeks
Injury, poisoning and procedural complications
Fall
8.3%
7/84 • 24 weeks
20.0%
7/35 • 24 weeks
Injury, poisoning and procedural complications
Excoriation
1.2%
1/84 • 24 weeks
5.7%
2/35 • 24 weeks
Injury, poisoning and procedural complications
Infusion related reaction
6.0%
5/84 • 24 weeks
2.9%
1/35 • 24 weeks
Investigations
Aspartate aminotransferase increased
21.4%
18/84 • 24 weeks
2.9%
1/35 • 24 weeks
Investigations
Decreased neutrophil count
16.7%
14/84 • 24 weeks
8.6%
3/35 • 24 weeks
Investigations
Decreased weight
16.7%
14/84 • 24 weeks
22.9%
8/35 • 24 weeks
Investigations
Alanine aminotransferase increased
11.9%
10/84 • 24 weeks
2.9%
1/35 • 24 weeks
Investigations
White blood cell count decreased
11.9%
10/84 • 24 weeks
0.00%
0/35 • 24 weeks
Investigations
Blood alkaline phosphatase increased
9.5%
8/84 • 24 weeks
2.9%
1/35 • 24 weeks
Investigations
Lymphocyte count decreased
6.0%
5/84 • 24 weeks
0.00%
0/35 • 24 weeks
Metabolism and nutrition disorders
Decreased appetite
47.6%
40/84 • 24 weeks
42.9%
15/35 • 24 weeks
Metabolism and nutrition disorders
Dehydration
23.8%
20/84 • 24 weeks
17.1%
6/35 • 24 weeks
Metabolism and nutrition disorders
Hypophosphatemia
17.9%
15/84 • 24 weeks
5.7%
2/35 • 24 weeks
Metabolism and nutrition disorders
Hypokalemia
16.7%
14/84 • 24 weeks
31.4%
11/35 • 24 weeks
Metabolism and nutrition disorders
Hypocalcemia
15.5%
13/84 • 24 weeks
5.7%
2/35 • 24 weeks
Metabolism and nutrition disorders
Hyponatremia
15.5%
13/84 • 24 weeks
11.4%
4/35 • 24 weeks
Metabolism and nutrition disorders
Hyperglycemia
14.3%
12/84 • 24 weeks
5.7%
2/35 • 24 weeks
Metabolism and nutrition disorders
Hypoalbuminemia
10.7%
9/84 • 24 weeks
0.00%
0/35 • 24 weeks
Metabolism and nutrition disorders
Hypomagnesemia
4.8%
4/84 • 24 weeks
5.7%
2/35 • 24 weeks
Musculoskeletal and connective tissue disorders
Muscular weakness
22.6%
19/84 • 24 weeks
31.4%
11/35 • 24 weeks
Musculoskeletal and connective tissue disorders
Back pain
17.9%
15/84 • 24 weeks
11.4%
4/35 • 24 weeks
Musculoskeletal and connective tissue disorders
Myalgia
16.7%
14/84 • 24 weeks
20.0%
7/35 • 24 weeks
Musculoskeletal and connective tissue disorders
Arthralgia
11.9%
10/84 • 24 weeks
11.4%
4/35 • 24 weeks
Musculoskeletal and connective tissue disorders
Bone pain
11.9%
10/84 • 24 weeks
11.4%
4/35 • 24 weeks
Musculoskeletal and connective tissue disorders
Musculoskeletal pain
6.0%
5/84 • 24 weeks
8.6%
3/35 • 24 weeks
Musculoskeletal and connective tissue disorders
Pain in extremity
7.1%
6/84 • 24 weeks
8.6%
3/35 • 24 weeks
Nervous system disorders
Peripheral neuropathy
36.9%
31/84 • 24 weeks
37.1%
13/35 • 24 weeks
Nervous system disorders
Headache
20.2%
17/84 • 24 weeks
8.6%
3/35 • 24 weeks
Nervous system disorders
Dizziness
13.1%
11/84 • 24 weeks
17.1%
6/35 • 24 weeks
Nervous system disorders
Peripheral sensory neuropathy
8.3%
7/84 • 24 weeks
22.9%
8/35 • 24 weeks
Nervous system disorders
Dysgeusia
6.0%
5/84 • 24 weeks
17.1%
6/35 • 24 weeks
Nervous system disorders
Ataxia
3.6%
3/84 • 24 weeks
5.7%
2/35 • 24 weeks
Nervous system disorders
Paraesthesia
6.0%
5/84 • 24 weeks
2.9%
1/35 • 24 weeks
Nervous system disorders
Sciatica
0.00%
0/84 • 24 weeks
5.7%
2/35 • 24 weeks
Nervous system disorders
Transient ischemic attack
0.00%
0/84 • 24 weeks
5.7%
2/35 • 24 weeks
Psychiatric disorders
Insomnia
21.4%
18/84 • 24 weeks
17.1%
6/35 • 24 weeks
Psychiatric disorders
Depression
3.6%
3/84 • 24 weeks
14.3%
5/35 • 24 weeks
Psychiatric disorders
Anxiety
6.0%
5/84 • 24 weeks
8.6%
3/35 • 24 weeks
Psychiatric disorders
Confusional state
6.0%
5/84 • 24 weeks
2.9%
1/35 • 24 weeks
Renal and urinary disorders
Hematuria
4.8%
4/84 • 24 weeks
5.7%
2/35 • 24 weeks
Renal and urinary disorders
Proteinuria
6.0%
5/84 • 24 weeks
0.00%
0/35 • 24 weeks
Renal and urinary disorders
Acute renal failure
1.2%
1/84 • 24 weeks
8.6%
3/35 • 24 weeks
Renal and urinary disorders
Urinary incontinence
3.6%
3/84 • 24 weeks
5.7%
2/35 • 24 weeks
Respiratory, thoracic and mediastinal disorders
Dyspnea
22.6%
19/84 • 24 weeks
5.7%
2/35 • 24 weeks
Respiratory, thoracic and mediastinal disorders
Cough
8.3%
7/84 • 24 weeks
8.6%
3/35 • 24 weeks
Respiratory, thoracic and mediastinal disorders
Pleural effusion
2.4%
2/84 • 24 weeks
5.7%
2/35 • 24 weeks
Respiratory, thoracic and mediastinal disorders
Productive cough
8.3%
7/84 • 24 weeks
0.00%
0/35 • 24 weeks
Skin and subcutaneous tissue disorders
Alopecia
14.3%
12/84 • 24 weeks
14.3%
5/35 • 24 weeks
Skin and subcutaneous tissue disorders
Rash
4.8%
4/84 • 24 weeks
11.4%
4/35 • 24 weeks
Skin and subcutaneous tissue disorders
Pruritus
1.2%
1/84 • 24 weeks
8.6%
3/35 • 24 weeks
Vascular disorders
Deep vein thrombosis
3.6%
3/84 • 24 weeks
5.7%
2/35 • 24 weeks
Vascular disorders
Hypertension
2.4%
2/84 • 24 weeks
5.7%
2/35 • 24 weeks
Vascular disorders
Hypotension
6.0%
5/84 • 24 weeks
5.7%
2/35 • 24 weeks

Additional Information

Dr. Vincent A. DiPippo

Progenics Pharmaceuticals, Inc.

Phone: (646) 975-2502

Results disclosure agreements

  • Principal investigator is a sponsor employee
  • Publication restrictions are in place