[Immunologic processes in carcinogenesis in the intestine]

It is hard to believe that the development of intestinal carcinomas is not linked--to some degree with a failure of the immunological defense mechanisms. For this several reasons may be evoked (for all exist examples) like a neutralization or blind-folding of the immune recognition, an inhibition of the effector cell activation or else genetic syndromes. New insights by a more pronounced research of the immune phenomena in the immediate tumor surroundings are needed.