- Metastatic, histologically or cytologically confirmed adenocarcinoma of the prostate that has progressed after start of androgen deprivation therapy, which includes prior orchiectomy or medical castration using leuteinizing hormone-releasing hormone (LHRH) antagonists such as leuprolide or goserelin (patients must remain on LHRH analogue therapy for the duration of the study if not surgically castrated). Progressive disease should be documented by: