PATIENT CHARACTERISTICS: Age: 50 and under Performance status: Karnofsky 70-100% Life expectancy: Greater than 8 weeks Hematopoietic: Not specified Hepatic: Bilirubin less than 2 mg/dL SGOT less than 4 times upper limit of normal (ULN) Renal: Creatinine less than 2 times ULN OR Creatinine clearance greater than 60 mL/min Cardiovascular: LVEF at least 50% by MUGA Pulmonary: DLCO at least 50% Other: HIV negative No active extramedullary disease Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception