PATIENT CHARACTERISTICS: Age: 18 and over Performance status: Not specified Hematopoietic: Not specified Hepatic: Bilirubin no greater than 1.5 mg/dL ALT/AST less than 3 times greater than normal Renal: Not specified Cardiovascular: Left ventricular ejection fraction at least 45% No NYHA class III/IV status No unstable angina Other: No Crohn's disease, ulcerative colitis, or other inflammatory bowel syndrome