PATIENT CHARACTERISTICS: Age: 18 to 60 Performance status: Not specified Life expectancy: Not specified Hematopoietic: Not specified Hepatic: Bilirubin less than 2 times upper limit of normal (ULN) SGOT/SGPT less than 2 times ULN Renal: Creatinine clearance greater than 60 mL/min Cardiovascular: Ejection fraction greater than 45% Pulmonary: DLCO greater than 60% FEV1 greater than 60% Other: No serious underlying medical condition that would preclude study Not pregnant or nursing No cerebellar dysfunction