PATIENT CHARACTERISTICS: Age: Under 46 Performance status: Karnofsky 70-100% Lansky 50-100% Hematopoietic: See Disease Characteristics Hepatic: Bilirubin less than 2.5 mg/dL AST less than 3 times normal Renal: Creatinine normal OR Creatinine clearance greater than 60 mL/min Cardiovascular: Asymptomatic OR Resting LVEF greater than 40% and improves with exercise Pulmonary: Asymptomatic OR DLCO greater than 45% of predicted (corrected for hemoglobin) Other: HIV negative No uncontrolled viral, bacterial, or fungal infection Not pregnant or nursing