PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG or Zubrod 0-2 Life expectancy: Not specified Hematopoietic: See Disease Characteristics Hepatic: Bilirubin no greater than 2.5 times upper limit of normal (ULN) ALT and AST no greater than 2.5 times ULN Renal: Creatinine no greater than 2.0 mg/dL Other: Not pregnant Negative pregnancy test Fertile patients must use effective contraception during and for 2 weeks after study