PRIOR CONCURRENT THERAPY: Biologic therapy: Not specified Chemotherapy: Prior chemotherapy required Endocrine therapy: Failed one secondary hormonal manipulation for metastatic disease Concurrent testicular androgen suppression (LHRH) allowed No concurrent hormonal therapy other than LHRH agonist At least 4 weeks since antiandrogen treatment in order to evaluate for response withdrawal Radiotherapy: At least 4 weeks since prior radiation therapy No prior strontium therapy Surgery: No prior orchiectomy Other: No concurrent cholesterol lowering agents No concurrent supplemental vitamins No concurrent antioxidants