title: Immunohistochemical localization of Y hapten and the structurally related H type-2 blood-group antigen on large-bowel tumours and normal adult tissues.
abstract: The monoclonal antibody C14/1/46/10 which defines the Y hapten carbohydrate antigen (Brown et al., 1983) was shown, by the indirect immunoperoxidase technique, to stain tissue sections of 96% of colo-rectal adenocarcinomas and 100% of colo-rectal adenomas. In contrast, a monoclonal antibody defining the related H type-2 blood-group antigen was found to stain 86% of adenocarcinomas and 32% of adenomas. In adenocarcinomas the percentage of cells stained for both antigens was, on average, greater in group O than in group A patients. In adenomas a focal pattern of expression was observed, for both Y hapten and H type-2 antigen, that was characteristic of group A but not group O adenocarcinomas. In the normal mucosa of the distal colon, whilst H type-2 antigen was absent, Y hapten was found in the immature cells of the crypt bases. A comparison of the cellular phenotypes present in adenocarcinomas, adenomas and normal mucosa of the distal colon supports the adenoma-carcinoma sequence hypothesis for the genesis of colo-rectal carcinomas. In normal adult tissues Y hapten was predominantly found on epithelial cells whilst nervous tissues, muscles and connective tissues were negative. The expression of Y hapten in several positive tissues was dependent upon secretor status. A comparison of the expression of Y hapten and H type 2 antigen on normal adult tissues revealed that all of the permutations of expression of these two structurally related antigens were possible.
mesh_terms: D000017:ABO Blood-Group System / Q000032:analysis* / Q000276:immunology*; D000230:Adenocarcinoma / Q000097:blood / Q000276:immunology / Q000473:pathology; D000236:Adenoma / Q000097:blood / Q000276:immunology / Q000473:pathology; D000911:Antibodies, Monoclonal; D000951:Antigens, Neoplasm / Q000032:analysis*; D003110:Colonic Neoplasms / Q000097:blood / Q000276:immunology* / Q000473:pathology; D000939:Epitopes / Q000032:analysis; D004947:Esophagus / Q000276:immunology / Q000473:pathology; D006241:Haptens / Q000032:analysis*; D006801:Humans; D007124:Immunoenzyme Techniques; D007413:Intestinal Mucosa / Q000276:immunology / Q000473:pathology; D007668:Kidney / Q000276:immunology / Q000473:pathology; D008297:Male; D012004:Rectal Neoplasms / Q000097:blood / Q000276:immunology* / Q000473:pathology; D013154:Spleen / Q000276:immunology / Q000473:pathology
chemical_list: D000017:ABO Blood-Group System; D000911:Antibodies, Monoclonal; D000951:Antigens, Neoplasm; D000939:Epitopes; D006241:Haptens