PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 Life expectancy: At least 6 weeks Hematopoietic: See Disease Characteristics Hepatic: Bilirubin less than 1.6 mg/dL (unless due to disease) Renal: Creatinine less than 1.6 mg/dL (unless due to disease) No prior hemorrhagic cystitis Other: Not pregnant Fertile patients must use effective contraception No active uncontrolled infection