PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 Life expectancy: Not specified Hematopoietic: Granulocyte count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hepatic: Albumin greater than 3 g/dL Bilirubin less than 2.0 mg/dL Renal: Creatinine less than 2.0 mg/dL Calcium normal Other: No prior or concurrent malignancy within the past 5 years except inactive nonmelanoma skin cancer, carcinoma in situ of the cervix, or other curatively treated cancers Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception