PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 Life expectancy: Not specified Hematopoietic: WBC at least 4,000/mm3 OR Granulocyte count at least 2,000/mm3 Platelet count greater than 100,000/mm3 No history of deep venous thrombosis Hepatic: Bilirubin no greater than 1.5 mg/dL SGOT and SGPT no greater than 2 times normal Renal: Creatinine no greater than 2.0 mg/dL OR Creatinine clearance at least 50 mL/min Cardiovascular: No active angina pectoris No known New York Heart Association class II-IV heart disease No history of myocardial infarction in the last 6 months Other: No history of prior malignancy except if curatively treated and disease free for time period considered appropriate for cure of specific cancer No other serious concurrent illness or active infection Effective contraception required of all fertile patients