Introduction
Prostate cancer, while commonly diagnosed in early forms, remains the second leading cause of cancer mortality in the United States and Europe.1 For patients who die of prostate cancer, some will be initially diagnosed and treated for metastatic castration-sensitive disease (mCSPC) while others will progress through non-metastatic castration-resistant disease (nmCPRC) following initial local therapy followed by androgen deprivation therapy (ADT) for biochemical recurrence. In either case, nearly all men who die of prostate cancer will have metastatic castration-resistant disease (mCRPC) prior to death.