Treatment of Patients With Metastatic Castration-Resistant Prostate Cancer With Homologous Recombination Deficiency
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This study is designed to evaluate the efficacy of pamiparib in patients with metastatic castration-resistant prostate cancer (mCRPC) positive for circulating tumor cells (CTC) with homologous recombination deficiency (CTC-HRD). All patients will receive pamiparib. The purpose of this study is to demonstrate that pamiparib will improve Objective Response Rate (ORR) and Prostate-Specific Antigen (PSA) response rate
Condition or disease
Metastatic Castration-Resistant Prostate Cancer (mCRPC)HRD
Drug: Pamiparib 60 mg PO BID
"This is a global, Phase 2, open-label study of pamiparib in approximately 100 patients with with metastatic castration-resistant prostate cancer (mCRPC) positive for circulating tumor cells (CTC) with homologous recombination deficiency (CTC-HRD). Subjects in Cohort 1 will include 50 mCRPC patients with CTC-HRD-positive, measurable metastatic disease (soft tissue with/without bone lesions), and positive BRCA1/2 mutation or negative/unknown BRCA1/2 mutation. Cohort 2 will include 30 mCRPC CTC-HRD positive patients with bone metastasis only and positive or negative/unknown BRCA1/2. Cohort 3 and 4 will include 20 mCRPC CTC-HRD negative/unknown patients with BRCA1/2 positive mutations, metastatic disease (measurable soft tissue with/without bone), and bone only. Subjects will undergo PSA level assessments approximately every 4 weeks as well as tumor assessments every 8 weeks, or as clinically indicated. Administration of pamiparib will continue until disease progression, unacceptable toxicity, death or another discontinuation criterion is met."
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Layout table for eligibility information
Ages Eligible for Study:
18 Years and older (Adult, Older Adult)
Sexes Eligible for Study:
Gender Based Eligibility:
Accepts Healthy Volunteers:
Men (> 18 years of age) with histologically or cytologically confirmed adenocarcinoma or poorly differentiated adenocarcinoma of the prostate without neuroendocrine differentiation with HRD deficiency by CTC-HRD assay and/or deleterious germline or somatic mutation in BRCA1 or BRCA2; mCRPC measurable disease and/or bone disease. • PSA progression with > 3 rising PSA levels with > 1 week between determinations and a screening PSA > 2 μg/L (2 ng/mL).
Must be surgically or medically castrated with serum testosterone levels of < 1.73 nmol/L (50 ng/dL), must have received > 1 prior androgen receptor-targeted therapy, and must have received > 1 taxane-based therapy.
mCRPC with 1 or 2 of the following:
Measurable disease per RECIST v1.1
CTC-HRD+ or BRCA1/2 mutation
PSA progression (PCWG3 criteria)
≥1 androgen receptor-targeted therapy (eg, abiraterone acetate/prednisone or enzalutamide) for mCRPC with progressive disease
≥1 taxane for metastatic prostate cancer
Prior sipuleucel-T and checkpoint inhibitors"
Chemotherapy, hormonal therapy, biologic therapy, radionuclide therapy, immunotherapy, investigational agent, anticancer Chinese medicine, or herbal remedies ≤ 5 half-lives if the half-life is known, ≤ 14 days if not known, before start of study treatment
Continued treatment with a bisphosphonate or denosumab is allowed, if administered at a stable dose > 28 days before start of study treatment
Radiotherapy ≤ 21 days (≤ 14 days, if single fraction of radiotherapy) before start of study treatment
Prior treatment for prostate cancer with any of the following: