PATIENT CHARACTERISTICS: Age: 18 and over Performance status: Karnofsky 70-100% Life expectancy: Not specified Hematopoietic: Absolute granulocyte count at least 2,000/mm3 Platelet count at least 100,000/mm3 Hemoglobin at least 8.0 g/dL Hepatic: Bilirubin no greater than 1.5 mg/dL* SGOT no greater than 1.5 times upper limit of normal* * Unless due to documented benign disease Renal: Creatinine no greater than 1.5 mg/dL Cardiovascular: No myocardial infarction within the past 6 months No symptomatic heart disease, including angina, congestive heart failure, or uncontrolled arrhythmias Other: No weight loss of greater than 5% in 3 months prior to diagnosis No other prior or concurrent invasive malignancy within the past 3 years except nonmelanomatous skin cancer Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception