PATIENT CHARACTERISTICS: Age: 59 and under Menopausal status: Not specified Performance status: Karnofsky 80-100% Life expectancy: Not specified Hematopoietic: Neutrophil count greater than 2,000/mm3 Platelet count greater than 150,000/mm3 Hemoglobin greater than 9 g/dL (blood transfusions allowed) Hepatic: Bilirubin no greater than 1.2 mg/dL SGOT or SGPT less than 1.5 times upper limit of normal Renal: Creatinine no greater than 1.2 mg/dL Creatinine clearance at least 80 mL/min No prior hemorrhagic cystitis Cardiovascular: Ejection fraction at least 55% by MUGA No prior valvular heart disease or arrhythmia Pulmonary: DLCO at least 60% lower limit of predicted pCO2 no greater than 43 mmHg on room air pO2 greater than 85 mmHg on room air FEV 1 at least 2 liters Other: No other prior malignancy except basal or squamous cell skin cancer, or carcinoma in situ or stage I carcinoma of the cervix Not pregnant HIV negative Hepatitis B negative No prior history of disabling psychosocial disorder No other CNS dysfunction