PRIOR CONCURRENT THERAPY: At least 6 months since myeloablative therapy with bone marrow transplantation Recovered from toxic effects of prior therapy Biologic therapy: Not specified Chemotherapy: At least 3 weeks since chemotherapy (6 weeks since mitomycin or nitrosourea) Endocrine therapy: Not specified Radiotherapy: At least 6 weeks since radiotherapy to any extremity site or significant marrow-containing compartment At least 6 months since the following: More than 24 Gy craniospinal irradiation Total abdominopelvic plus lung irradiation Mantle plus Y-port irradiation Total-body irradiation No palliative radiotherapy to bony lesions within 1 month after entry Surgery: Not specified