RECRUITING Phase 2 ClinicalTrials.gov

Carboplatin or Olaparib for BRcA Deficient Prostate Cancer

Sponsor: VA Office of Research and Development • ClinicalTrials.gov ID: NCT04038502

Registry updated: 2026-09-17

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Description

This is an unblinded, randomized clinical study comparing the efficacy of DNA damaging chemotherapy using carboplatin, to standard of care therapy for patients who have metastatic castrate resistant prostate cancer. This trial will use olaparib or carboplatin as initial therapy with crossover to the alternate or second-line drug after first progression for patients with tumors containing BARD1, BRCA1, BRCA2, BRIP1, CHEK1, FANCL, PALB2, RAD51B, RAD51C, RAD51D, or RAD54L inactivating mutations. Participants are randomized (1:1) and receive either carboplatin (AUC 5, IV) every 21 days, first or olaparib taken orally (300 mg), twice daily in 28 day cycles, until intolerance, complete response, or progression by Prostate Cancer Working Group 3 (PCWG3) criteria. Participants then crossover from the first-line therapy to the second-line therapy with the opposite study medication and receive treatment to intolerance or progression (whichever is first). Enrolled participants will be allowed to crossover to second line therapy if they continue to meet initial eligibility criteria, and at least three weeks have elapsed since last administration of either carboplatin or olaparib. Throughout the study, safety and tolerability will be assessed. Progression will be evaluated with bone scan, CT of the abdomen/pelvis, or MRI and PSA as per PCWG3 criteria.

Interventions

Carboplatin (Drug)
Chemotherapy FDA approved drug used to treat: ovarian, lung, head and neck cancers. It is sometimes used in combination with other medications or off-label use to treat other metastatic cancers.
Olaparib (Drug)
Olaparib is a targeted therapy drug that is used for mCRPC and is approved by the FDA for this use.

Eligibility criteria

Inclusion Criteria: 1. Signed study informed consent form (ICF) and HIPAA authorization form 2. Diagnosis of prostate cancer (pure small-cell histology or pure high-grade neuroendocrine histology are excluded; neuroendocrine differentiation is allowed) 3. Ongoing gonadal androgen deprivation therapy with gonadotropin-releasing hormone (GnRH) analogues, antagonists or orchiectomy. Patients who have not had an orchiectomy must be maintained on effective GnRH analogue/antagonist therapy 4. mCRPC as defined by serum testosterone \< 50 nanograms per milliliter (ng/ml) for patients on GnRH analogues or antagonists) and at least one of the following: * Prostate-specific antigen (PSA) level of at least 2 nanograms per milliliter (ng/ml) that has risen on at least 2 successive occasions at least 1 week apart * Evaluable disease progression by modified RECIST 1.1 (Response Evaluation Criteria in Solid Tumors) * Progression of metastatic bone disease on bone scan, CT or MRI with \> 2 new lesions 5. Prior therapy with abiraterone acetate, enzalutamide, apalutamide, or darolutamide 6. Eastern Cooperative Oncology Group (ECOG) Performance Status of \< 2 (see Appendix 3, ECOG Grading Scale) 7. Results of previous standard DNA testing, or previous research testing, which confirms RAD51B, RAD51C, RAD51D, or RAD54L mutations (see Introduction, Section 2 for study design and previous research on targeted therapy) from primary, metastatic tumor or circulating tumor DNA, or pathogenic/likely pathogenic germline variant as assessed by a CLIA certified laboratory level assay for DNA sequencing. 8. Patients must have normal organ and bone marrow function measured within 28 days prior to administration of study treatment as defined below: * Hemoglobin \> 10.0 grams per deciliter (g/dL) * Absolute neutrophil count (ANC) \> 1.5 x 109/liter (L) * Platelet count \> 100 x 109/L * Total bilirubin \< 1.5 x institutional upper limit of normal (ULN) * Aspartate aminotransferase (AST) (Serum Glutamic Oxaloacetic Transaminase (SGOT) / Alanine aminotransferase (ALT) (Serum Glutamic Pyruvate Transaminase (SGPT) \< 2.5 x institutional upper limit of normal unless liver metastases are present in which case, they must be \< 5x ULN * Patients must have creatinine clearance estimated using the Cockcroft-Gault equation of \>51 mL/min: Estimated creatinine clearance =(140-age \[years\]) x weight (kg)/(serum creatinine (mg/dL) x 72) Exclusion Criteria: 1. Currently receiving active therapy for other neoplastic disorder(s) 2. Concurrent enrollment in another clinical investigational drug or device study 3. Histologic evidence of small cell carcinoma (morphology alone - immunohistochemical evidence of neuroendocrine differentiation without morphologic evidence is not exclusionary) 4. Prior treatment with platinum, mitoxantrone or PARP inhibitor for castration resistant prostate cancer 5. Known parenchymal brain metastasis 6. Active or symptomatic viral hepatitis or chronic liver disease AST or ALT \> 2.5 x ULN or total bilirubin \> ULN (unless Gilbert's syndrome is the etiology of hyperbilirubinemia) 7. Subjects with myelodysplastic syndrome/acute myeloid leukemia or with features suggestive of MDS/AML 8. Concomitant use of known strong CYP3A inhibitors (e.g. itraconazole, telithromycin, clarithromycin, protease inhibitors boosted with ritonavir or cobicistat, indinavir, saquinavir, nelfinavir, boceprevir, telaprevir) or moderate CYP3A inhibitors (e.g. ciprofloxacin, erythromycin, diltiazem, fluconazole, verapamil). The required washout period prior to starting olaparib is 2 weeks 9. Concomitant use of known strong (e.g. phenobarbital, enzalutamide, phenytoin, rifampicin, rifabutin, rifapentine, carbamazepine, nevirapine and St John's Wort) or moderate CYP3A inducers (e.g. bosentan, efavirenz, modafinil). The required washout period prior to starting olaparib is 5 weeks for phenobarbital and 3 weeks for other agents 10. Subjects unable to swallow orally administered medication and subjects with gastrointestinal disorders likely to interfere with absorption of the study medication 11. Clinically significant heart disease as evidenced by myocardial infarction, or arterial thrombotic events in the past 6 months, severe or unstable angina, or New York Heart Association (NYHA) Class II-IV heart disease or cardiac ejection fraction measurement of \< 35 % at baseline 12. Treatment with an investigational therapeutic within 30 days of Cycle-1 13. Presence of dementia, psychiatric illness, and/or social situations limiting compliance with study requirements or understanding HIPAA authorization and/or giving of informed consent 14. Any condition(s), medical or otherwise, which, in the opinion of the Investigators, would jeopardize either the patient or the integrity of the data obtained

Conditions

Metastatic Castrate Resistant Prostate Cancer BARD1, BRCA1, BRCA2, BRIP1, CHEK1, FANCL, PALB2 RAD51B, RAD51C, RAD51D, or RAD54L Mutations

Locations

VA Greater Los Angeles Healthcare System, West Los Angeles, CA — West Los Angeles, California, United States
Rocky Mountain Regional VA Medical Center, Aurora, CO — Aurora, Colorado, United States
Washington DC VA Medical Center, Washington, DC — Washington D.C., District of Columbia, United States
Bay Pines VA Healthcare System, Pay Pines, FL — Bay Pines, Florida, United States
Orlando VA Medical Center, Orlando, FL — Orlando, Florida, United States
Atlanta VA Medical and Rehab Center, Decatur, GA — Decatur, Georgia, United States
Boise VA Medical Center, Boise, ID — Boise, Idaho, United States
Jesse Brown VA Medical Center, Chicago, IL — Chicago, Illinois, United States
VA Ann Arbor Healthcare System, Ann Arbor, MI — Ann Arbor, Michigan, United States
Minneapolis VA Health Care System, Minneapolis, MN — Minneapolis, Minnesota, United States
Kansas City VA Medical Center, Kansas City, MO — Kansas City, Missouri, United States
Manhattan Campus of the VA NY Harbor Healthcare System, New York, NY — New York, New York, United States
James J. Peters VA Medical Center, Bronx, NY — The Bronx, New York, United States
Durham VA Medical Center, Durham, NC — Durham, North Carolina, United States
VA Portland Health Care System, Portland, OR — Portland, Oregon, United States
Philadelphia MultiService Center, Philadelphia, PA — Philadelphia, Pennsylvania, United States
VA Puget Sound Health Care System Seattle Division, Seattle, WA — Seattle, Washington, United States
William S. Middleton Memorial Veterans Hospital, Madison, WI — Madison, Wisconsin, United States

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Official Source

Data sourced from ClinicalTrials.gov, a service of the U.S. National Institutes of Health.

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