Phase II Study of PARP Inhibitor Olaparib and IV Ascorbate in Castration Resistant Prostate Cancer

Have a known DNA repair mutation (minimum list of genes that must be mutation negative for inclusion: ATM, BARD1, BRCA1, BRCA2, BRIP1, CDK12, CHEK1, CHEK2, FANCL, PALB2, RAD51B, RAD51C, RAD51D, RAD45L). In addition, patients who have not completed germline and somatic testing to rule out such a mutation are ineligible until they have completed testing. If tissue or liquid ctDNA sequencing was not previously done, testing using the Foundation One liquid biopsy test or an equivalent FDA-approved test is acceptable as standard of care.

* DNA repair mutation variant of unknown significance (VUS) allowed

Have had known active central nervous system (CNS) metastases and/or carcinomatous meningitis.

Patients with symptomatic uncontrolled brain metastases. A scan to confirm the absence of brain metastases is not required. The patient can receive a stable dose of corticosteroids before and during the study as long as these were started at least 4 weeks prior to treatment. Patients with spinal cord compression unless considered to have received definitive treatment for this and evidence of clinically stable disease for 28 days.

No prior olaparib, rucaparib, or other PARP inhibitor

Have had major surgery within 2 weeks of dosing of investigational agent

Have had palliative radiation or another biological cancer therapy within 2 weeks prior to the first dose of study drug (2 week wash out required)

Patients receiving any systemic chemotherapy or radiotherapy within 3 weeks prior to study treatment

Have received other investigational drugs within 14 days prior to enrollment.

Is expected to require chemotherapy or radiation for pain palliation in the next 12 weeks.

Have used or plan concomitant use of the following medications in the past 6 months prior to enrollment: 5-alpha reductase inhibitors unless subject has been taking stable dose of medication for prior 6 months

Concomitant use of known strong CYP3A inhibitors (eg. itraconazole, telithromycin, clarithromycin, protease inhibitors boosted with ritonavir or cobicistat, indinavir, saquinavir, nelfinavir, boceprevir, telaprevir) or moderate CYP3A inhibitors (eg. ciprofloxacin, erythromycin, diltiazem, fluconazole, verapamil). The required washout period prior to starting study treatment is 2 weeks. See the following link for a complete list of known CYP3A inhibitors: https://www.fda.gov/drugs/drug-interactions-labeling/drug-development-and-drug-interactions-table-substrates-inhibitors-and-inducers

Concomitant use of known strong (eg. phenobarbital, enzalutamide, phenytoin, rifampicin, rifabutin, rifapentine, carbamazepine, nevirapine and St John's Wort ) or moderate CYP3A inducers (eg. bosentan, efavirenz, modafinil). The required washout period prior to starting study treatment is 5 weeks for enzalutamide or phenobarbital and 3 weeks for other agents. See the following link for a complete list of known CYP3A inhibitors:https://www.fda.gov/drugs/drug-interactions-labeling/drug-development-and-drug-interactions-table-substrates-inhibitors-and-inducers

Have moderate or severe cardiovascular disease:

* Has the presence of cardiac disease, including a myocardial infarction within six months prior to study entry, unstable angina pectoris, New York Heart Association Class III/IV congestive heart failure, or uncontrolled hypertension.

* Resting ECG indicating uncontrolled, potentially reversible cardiac conditions, as judged by the investigator (eg., unstable ischemia, uncontrolled symptomatic arrhythmia, congestive heart failure, QTc prolongation \>500 ms, electrolyte disturbances, etc.), or patients with congenital long QT syndrome.

Have uncontrolled intercurrent illness, including but not limited to ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations that would limit compliance with study requirements

Other malignancy unless curatively treated with no evidence of disease for \>5 years except adequately treated non-melanoma skin cancer

Persistent toxicities (\>Common Terminology Criteria for Adverse Event (CTCAE) grade 2) caused by previous cancer therapy, excluding alopecia

Patients with myelodysplastic syndrome/acute myeloid leukemia or with features suggestive of MDS/AML

Patients considered a poor medical risk due to a serious, uncontrolled medical disorder, non-malignant systemic disease or active, uncontrolled infection. Examples include, but are not limited to, uncontrolled ventricular arrhythmia, recent (within 3 months) myocardial infarction, uncontrolled major seizure disorder, unstable spinal cord compression, superior vena cava syndrome, extensive interstitial bilateral lung disease on High Resolution Computed Tomography (HRCT) scan or any psychiatric disorder that prohibits obtaining informed consent

Patients unable to swallow orally administered medication and patients with gastrointestinal disorders likely to interfere with absorption of the study medication.

Patients with known active hepatitis (i.e. Hepatitis B or C)

Previous allogenic bone marrow transplant or double umbilical cord blood transplantation (dUCBT)

Patients with a known hypersensitivity to olaparib or any of the excipients of the product.

What this study is about