PRIOR CONCURRENT THERAPY: Biologic therapy: Not specified Chemotherapy: No prior chemotherapy Arm I: No concurrent chemotherapy Endocrine therapy: At least 1 month since prior hormone therapy, including estramustine, except LHRH agonists, which continue Arm I: No concurrent estramustine Radiotherapy: At least 3 months since prior strontium 89 No concurrent strontium Surgery: See Disease Characteristics