PATIENT CHARACTERISTICS: Age: 16 and over Performance status: SWOG 0-2 Life expectancy: Not specified Hematopoietic: Absolute granulocyte count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin no greater than 2 times upper limit of normal (ULN) SGOT no greater than 2 times ULN Renal: Creatinine no greater than 2.0 mg/dL Creatinine clearance at least 25 mL/min Other: At least 5 years since other prior malignancy except adequately treated basal cell or squamous cell skin cancer, carcinoma in situ of the cervix, or adequately treated stage I or II cancer in complete remission Not pregnant or nursing Fertile patients must use effective contraception