- Other: No other prior or concurrent malignancy within the past 3 years except limited basal cell or squamous cell carcinoma of the skin or carcinoma in situ of the cervix; Adequate and nutritionally balanced enteral intake of at least 1,800 kcal/day (enteral feeding tube dependent allowed); No intravenous alimentation as primary source of calories; No other serious illness or medical condition that would preclude study (i.e., active systemic lupus erythematosus, Crohn's disease or AIDS); No prior immunodeficiency (i.e., HIV infection, organ transplant, or chronic steroid use); Not pregnant or nursing; Negative pregnancy test; Fertile patients must use effective contraception