PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 OR Karnofsky 70-100% Life expectancy: Greater than 4 months Hematopoietic: WBC at least 3000/mm3 Platelet count at least 100,000/mm3 Granulocyte count at least 1500/mm3 Hepatic: Bilirubin no greater than 2.5 times normal SGOT and SGPT no greater than 2.5 times upper limit of normal Renal: Creatinine no greater than 1.5 mg/dL Creatinine clearance at least 60 mL/min Other: No other significant infection No other medical or psychiatric illness Not pregnant or nursing Fertile patients must use effective contraception