PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-1 Life expectancy: Not specified Hematopoietic: Hemoglobin at least 9.0 g/dL Platelet count at least 100,000/mm3 WBC at least 3500/mm3 Absolute granulocyte count at least 1500/mm3 Hepatic: Bilirubin no greater than 1.5 mg/dL SGOT and SGPT less than 2.5 times normal Renal: Creatinine no greater than 1.8 mg/dL Other: Not pregnant Not HIV or hepatitis BsAg positive No major systemic infections No coagulation disorders No major illness of cardiovascular or respiratory systems No symptomatic CNS disease or evidence of cerebral edema