PATIENT CHARACTERISTICS: Age: 18 to 75 Performance status: ECOG 0-1 Life expectancy: At least 6 months Hematopoietic: Platelet count at least 100,000/mm3 Hemoglobin at least 8 g/dL Hepatic: Bilirubin no greater than 1.4 mg/dL AST or ALT no greater than 1.5 times normal No active hepatitis Renal: Creatinine no greater than 1.4 mg/dL Cardiovascular: No congestive heart failure, unstable angina, or current symptomatic arrhythmias Other: HIV negative No autoimmune diseases (e.g., lupus erythematosus, multiple sclerosis, or ankylosing spondylitis) No condition that would be considered as a contraindication for surgery Not pregnant or nursing Adequate contraception required for all fertile patients