177Lu-PSMA-617 Therapy and Olaparib in Patients With Metastatic Castration Resistant Prostate Cancer

This phase 1, open label, multicentre, dose-escalation and dose-expansion study is designed to evaluate the safety and tolerability of olaparib in combination with 177Lu-PSMA in patients with mCRPC. Patients with mCRPC who have previously progressed on a novel AR targeted agent (abiraterone and/or enzalutamide and/or apalutamide) and have not had prior exposure to platinums, PARP inhibitors or 177Lu-PSMA will be eligible for the study. Patients can have had prior exposure to docetaxel in the chemotherapy naïve setting or castrate setting. Patients will be enrolled in two stages: a dose escalation and a dose expansion phase. The clinical and translational outcomes from this study will inform the design of future phase 2/3 clinical trials of this combination. This is a single arm study where patients will receive 177Lu-PSMA and olaparib for up to 6 cycles.