PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 Life expectancy: Not specified Hematopoietic: WBC at least 3,500/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin less than 1.5 mg/dL Renal: Creatinine less than 2.0 mg/dL Cardiovascular: No myocardial infarction in the last 6 months Other: No other prior malignancy in the past 5 years except adequately treated basal cell or squamous cell skin cancer or carcinoma in situ of the cervix No active or uncontrolled infection No psychiatric or other disorders No other concurrent disease that would preclude entry into this study Not pregnant or nursing Effective contraception required of all fertile patients