Summary
The purpose of this study is to assess the efficacy and safety of opevesostat plus daily
corticosteroids compared to alternative abiraterone acetate or enzalutamide in
participants with Metastatic Castration-resistant Prostate Cancer (mCRPC) previously
treated with one next-generation hormonal agent (NHA). The primary study hypothesis is
that opevesostat is superior to alternative abiraterone acetate or enzalutamide with
respect to radiographic progression free survival (rPFS) per Prostate Cancer Working
Group (PCWG) Modified Response Evaluation Criteria in Solid Tumors (RECIST 1.1), as
assessed by Blinded Independent Central Review (BICR), in androgen receptor ligand
binding domain (AR LBD) mutation positive and negative participants.