PATIENT CHARACTERISTICS: Age: 16 to 55 Performance status: Zubrod 0-2 Life expectancy: Not specified Hematopoietic: See Disease Characteristics Hepatic: Not specified Renal: Not specified Other: No prior malignancy within past 5 years except: Adequately treated basal cell or squamous cell skin cancer Carcinoma in situ of the cervix Adequately treated stage I or II cancer in complete remission HIV negative Not pregnant or nursing Fertile patients must use effective contraception