PATIENT CHARACTERISTICS: Age: Over 17 Performance status: Karnofsky 70-100% Life expectancy: At least 3 months Hematopoietic: Hemoglobin at least 10 g/dL No decline in hemoglobin of 2 g/dL or more for one month prior to study Hematocrit at least 30% Hepatic: SGOT no greater than 3 times upper limit of normal Bilirubin less than 2.0 mg/dL Renal: Creatinine no greater than 2.0 mg/dL OR Creatinine clearance at least 60 mL/min Cardiovascular: No unstable cardiac disease Pulmonary: No debilitating pulmonary disease Other: No uncontrolled pain No uncontrolled serious infection No significant comorbidity that would preclude study participation Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception