PATIENT CHARACTERISTICS: Age: Over 18 Performance status: At least 3 months Life expectancy: ECOG 0-2 Hematopoietic: Absolute neutrophil count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin less than 1.2 mg/dL SGOT and/or SGPT no greater than 1.5 times upper limit of normal (ULN) (no greater than 2.5 times ULN allowed if alkaline phosphatase no greater than ULN) Alkaline phosphatase no greater than 2.5 times ULN (no greater than 4 times ULN allowed if SGOT and/or SGPT no greater than ULN) Renal: Creatinine clearance at least 55 mL/min Other: HIV negative No active infection Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception No concurrent medical condition that would preclude compliance with study