PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 Life expectancy: Not specified Hematopoietic: See Disease Characteristics Platelet count at least 75,000/mm3 Hepatic: Bilirubin no greater than 1.5 times upper limit of normal (ULN) SGOT no greater than 1.5 times ULN (unless due to hemolysis or chronic lymphocytic leukemia) Renal: Creatinine no greater than 1.5 times ULN Cardiovascular: No New York Heart Association class III or IV heart disease No myocardial infarction within the past month Other: No uncontrolled infection HIV negative No other active malignancy Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception