On May 19, 2020 the FDA approved the use of olaparib (Lynparza) as treatment in BRCA and other gene carriers (homologous recombination repair genes) with metastatic castration-resistant prostate cancer who have been treated with enzalutamide or abiraterone.
Link to full article: https://www.fda.gov/drugs/drug-approvals-and-databases/fda-approves-olaparib-hrr-gene-mutated-metastatic-castration-resistant-prostate-cancer