PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 Life expectancy: At least 12 weeks Hematopoietic: Platelet count at least 100,000/mm3 Absolute granulocyte count at least 1,500/mm3 Hemoglobin at least 9 g/dL Hepatic: Bilirubin no greater than 2.0 mg/dL SGOT, SGPT and alkaline phosphatase less than 3 times upper limit of normal Serum albumin at least 3.0 g/dL Renal: Serum creatinine no greater than 1.5 mg/dL Other: Not eligible for higher priority protocol No prior malignancy within 5 years except adequately treated basal cell carcinoma of the skin or carcinoma in situ of the cervix Not pregnant or nursing Fertile patients must use effective birth control No underlying medical condition precluding treatment