PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 Hematopoietic: Absolute neutrophil count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hepatic: Total bilirubin no greater than 2 times normal OR Direct bilirubin no greater than 1.0 mg/dL above normal Renal: Creatinine no greater than 2.0 times normal Cardiovascular: No uncontrolled congestive heart failure No uncontrolled hypertension No uncontrolled angina pectoris Other: No uncontrolled or active infection No AIDS or HIV antibody No second malignancy within 5 years except: Carcinoma in situ of the cervix Resected nonmelanomatous skin cancer Prostate cancer in remission following radical retropubic prostatectomy or radiotherapy Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception