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Life sciences · Phase 2 Trial
ClinicalTrials.gov · November 5, 2026
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Phase 2 Trial.
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Registry record from ClinicalTrials.gov (NCT04550494). This is a study registration, not published results. Lead sponsor: National Cancer Institute (NCI). Recruitment status: ACTIVE_NOT_RECRUITING. Phase: PHASE2. Study type: INTERVENTIONAL. Enrollment: 29 participants (ACTUAL). Conditions: Anatomic Stage III Breast Cancer AJCC v8, Anatomic Stage IV Breast Cancer AJCC v8, Castration-Resistant Prostate Carcinoma, Clinical Stage III Gastric Cancer AJCC v8, Clinical Stage IV Gastric Cancer AJCC v8, HER2-Positive Breast Carcinoma, Locally Advanced Breast Carcinoma, Locally Advanced Gastric Carcinoma, Locally Advanced Malignant Solid Neoplasm, Locally Advanced Ovarian Carcinoma, Locally Advanced Pancreatic Carcinoma, Locally Advanced Prostate Carcinoma, Metastatic Breast Carcinoma, Metastatic Gastric Carcinoma, Metastatic Malignant Solid Neoplasm, Metastatic Ovarian Carcinoma, Metastatic Pancreatic Carcinoma, Metastatic Prostate Carcinoma, Platinum-Sensitive Ovarian Carcinoma, Recurrent Breast Carcinoma, Recurrent Gastric Carcinoma, Recurrent Ovarian Carcinoma, Recurrent Pancreatic Carcinoma, Recurrent Prostate Carcinoma, Stage II Pancreatic Cancer AJCC v8, Stage III Ovarian Cancer AJCC v8, Stage III Pancreatic Cancer AJCC v8, Stage III Prostate Cancer AJCC v8, Stage IV Ovarian Cancer AJCC v8, Stage IV Pancreatic Cancer AJCC v8, Stage IV Prostate Cancer AJCC v8. Interventions: PROCEDURE: Biopsy Procedure; PROCEDURE: Biospecimen Collection; PROCEDURE: Computed Tomography; PROCEDURE: Magnetic Resonance Imaging; DRUG: Talazoparib. Primary outcome measures: Percent of patients who demonstrate simultaneous Rad51 activation , At cycle 2 day 1. Brief summary: This phase II trial studies if talazoparib works in patients with cancer that may have spread from where it first started to nearby tissue, lymph nodes, or distant parts of the body (advanced) and has mutation(s) in deoxyribonucleic acid (DNA) damage response genes who have or have not already been treated with another PARP inhibitor. Talazoparib is an inhibitor of PARP, a protein that helps repair damaged DNA. Blocking PARP may help keep cancer cells from repairing their damaged DNA, causing them to die. PARP inhibitors are a type of targeted therapy. All patients who take part on this study must have a gene aberration that changes how their tumors are able to repair DNA. This trial may help scientists learn whether some patients might benefit from taking different PARP inhibitors "one after the other" and learn how talazoparib works in treating patients with advanced cancer who have aberration in DNA repair genes.