PATIENT CHARACTERISTICS: Age: 16 to 60 Performance status: Not specified Hematopoietic: Granulocyte count at least 2,000/mm3 Platelet count at least 150,000/mm3 Hepatic: Bilirubin no greater than 2.5 mg/dL Renal: Creatinine no greater than 2 mg/dL Other: No other medical condition that would preclude study therapy HIV negative No other prior malignancy except basal cell skin cancer Not pregnant