PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 Life expectancy: At least 3 months Hematopoietic: Neutrophil count at least 2,000/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin less than 1.5 times upper limit of normal (ULN) Alkaline phosphatase and transaminases no greater than 2.5 times ULN (no greater than 5 times ULN in case of hepatic metastases) Renal: Creatinine no greater than 1.7 mg/dL Cardiovascular: Normal cardiac function No ischemic disease in past 6 months Other: Not pregnant or nursing Fertile patients must use effective contraception No other prior malignancies except cone biopsied carcinoma of the cervix or adequately treated basal or squamous cell skin carcinoma No concurrent unstable systemic disease or active uncontrolled infection No psychological, familial, sociological, or geographical condition that would preclude study