PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 Life expectancy: Greater than 3 months Hematopoietic: Absolute neutrophil count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin no greater than 0.3 mg/dL above upper limit of normal (ULN) AST no greater than 3 times ULN Renal: Creatinine no greater than 1.0 mg/dL above ULN Cardiovascular: No New York Heart Association class III or IV heart disease Other: No uncontrolled infection No chronic debilitating disease Not pregnant or lactating Fertile patients must use effective contraception