PATIENT CHARACTERISTICS: Age: Under 51 Performance status: Not specified Life expectancy: No patients with life expectancy severely limited by diseases other than malignancy Hematopoietic: See Disease Characteristics Hepatic: AST no greater than 2 times normal Renal: Creatinine no greater than 2 times normal OR Creatinine clearance at least 50% for age, weight, and height Cardiovascular: No cardiac insufficiency requiring treatment No symptomatic coronary artery disease Pulmonary: No severe hypoxemia pO2 less than 70 mm Hg with decreased DLCO less than 70% predicted OR No mild hypoxemia pO2 less than 80 mm Hg with severely decreased DLCO less than 60% predicted Other: HIV negative Not pregnant or nursing Fertile patients must use effective contraception during and for one year after study No leukoencephalopathy