Overview A Study to Test if Enzalutamide is Effective and Safe in Prostate Cancer Patients Who Have Never Had Hormone Therapy Status: Completed Trial end date: 2017-04-27 Target enrollment: Participant gender: Summary To evaluate the effect of enzalutamide on prostate specific antigen (PSA) level in men with prostate cancer. Phase: Phase 2 Details Lead Sponsor: Astellas Pharma IncCollaborator: Medivation, Inc.Treatments: Hormones