PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 Karnofsky 70-100% Life expectancy: At least 3 months Hematopoietic: WBC greater than 3,000/mm3 Platelet count greater than 100,000/mm3 Hepatic: Bilirubin less than 1.5 times upper limit of normal (ULN) Alkaline phosphatase no greater than 2 times ULN Transaminases no greater than 2 times ULN Renal: Creatinine no greater than 1.5 mg/dL Cardiovascular: Normal cardiac function No ischemic heart disease within the past 6 months Normal electrocardiogram Other: No unstable systemic diseases No active uncontrolled infections No prior or other concurrent malignancies except adequately treated basal or squamous cell skin cancer or carcinoma in situ of the cervix No psychological, familial, sociological, or geographical condition that would preclude study Not pregnant or nursing Fertile patients must use effective contraception