PATIENT CHARACTERISTICS: Age: 18 and over Performance status: Zubrod 0-2 Life expectancy: Not specified Hematopoietic: Absolute granulocyte count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hemoglobin at least 9 g/dL (transfusion allowed) Lymphocyte count at least 800/mm3 Hepatic: See Disease Characteristics Bilirubin no greater than 1.5 mg/dL SGOT or SGPT less than 2.5 times upper limit of normal Albumin at least 3.5 g/dL Hepatitis B and C negative Renal: Creatinine no greater than 1.5 mg/dL Cardiovascular: No significant heart disease Other: Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception Loss of no more than 10% of body weight over a 4 month period No overt autoimmune disease No active ulcer disease No prior inflammatory bowel disease (e.g., Crohn's disease or ulcerative colitis)