PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 Life expectancy: Not specified Hematopoietic: Absolute neutrophil count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hepatic: SGOT no greater than 2.5 times upper limit of normal Bilirubin no greater than 1.5 mg/dL Renal: Creatinine no greater than 1.5 mg/dL Cardiovascular: No acute ischemia or significant conduction abnormality (i.e., bifascicular block or 2nd or 3rd degree AV blocks) Other: No other serious medical or psychiatric illness Not pregnant or nursing Fertile patients must use effective contraception