PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ZUBROD 0-1 Life expectancy: Not specified Hematopoietic: Granulocyte count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin less than 1.5 mg/dL SGOT no greater than upper limit of normal Renal: Creatinine clearance at least 20 mL/min Other: Not pregnant or nursing