PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 Life expectancy: At least 3 months Hematopoietic: Platelet count at least 100,000/mm3 Absolute neutrophil count at least 1,500/mm3 Hepatic: Total bilirubin no greater than 2.0 mg/dL Renal: Creatinine clearance at least 40 mL/min Other: No active infections Not HIV positive No coexisting medical condition Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception