Sacituzumab Govitecan in Patients With Metastatic Castration-Resistant Prostate Cancer Progressing on Second Generation AR-Directed Therapy

This study will investigate the safety and efficacy of Sacituzumab Govitecan in patients with metastatic castration-resistant prostate cancer progressing on second generation AR-directed therapy. Patients who have progressed while on therapy with combination enzalutamide/abiraterone or ARN-509/abiraterone as part of ongoing clinical trials are allowed and may be enrolled in the study. To better understand the heterogeneity of response and in particular to identify patients likely to benefit, an extensive correlative biomarker program will be included to collect and analyze tumor tissue biopsies, circulating tumor cells (CTCs), and circulating tumor DNA (ctDNA). A validated predictive biomarker would benefit the individual patient by enabling him to be treated with a safe effective oral drug and avoid one from which he is unlikely to benefit. It is also essential for prostate cancer drug development because the increasing availability of more life-prolonging therapies is making it more difficult to prove a survival benefit for the next promising agent.