RecruitingPhase 2Drug trialA Study for Subjects With Prostate Cancer Who Previously Participated in an Enzalutamide Clinical StudyThe purpose of this study is to collect long term safety data in subjects who are continuing to derive clinical benefit from treatment with Enzalutamide from the subjects participation in an enzalutamide clinical study sponsored by Astellas or Medivation (i.e., parent study) which has completed, at a minimum, the primary analysis or the study specified evaluation period.