PRIOR CONCURRENT THERAPY: Biologic therapy: Prior biological response modifiers allowed Chemotherapy: No time limit between cytotoxic therapy and protocol treatment Prior cumulative melphalan dose less than 300 mg Endocrine therapy: Corticosteroids for hypercalcemia allowed Radiotherapy: Prior radiotherapy allowed Prior pelvic radiotherapy allowed, but patients with such therapy are unlikely to have adequate PBSC harvested Surgery: Not specified