PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0 or 1 Life expectancy: Greater than 3 months Hematopoietic: Absolute granulocyte count at least 2,000/mm2 Platelet count at least 100,000/mm2 Hepatic: Bilirubin no greater than 1.5 mg/dL Transaminases less than 3 times normal Renal: Creatinine no greater than 1.5 mg/dL OR Creatinine clearance at least 60 mL/min Cardiovascular: No myocardial infarction within 6 months No history of congestive heart failure No uncontrolled angina No uncontrolled arrhythmia Other: No concurrent medical illness or active infection that would render treatment unsafe Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception