PATIENT CHARACTERISTICS: Age: Not specified Performance status: Not specified Life expectancy: Not specified Hematopoietic: Absolute neutrophil count at least 1,300/mm3 Platelet count at least 75,000/mm3 Hepatic: Not specified Renal: Creatinine no greater than 2 mg/dL Other: Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception