PATIENT CHARACTERISTICS: Age: 15 to 69 Hematopoietic: See Disease Characteristics Granulocyte count at least 1,000/mm3 Hepatic: Bilirubin less than 1.5 mg/dL AST less than 3 times normal Alkaline phosphatase less than 3 times normal No cirrhosis or chronic hepatitis Biopsy required if chronic liver disease suspected (history of alcohol abuse or possible hepatitis) Renal: Creatinine less than 2.0 mg/dL Other: Not pregnant or nursing Fertile patients must use effective contraception