[Immunohistologic study of the localization of organ-specific antigens of the stomach and intestine and carcinoembryonic antigen in normal and pathologically altered stomach tissues].

Localization of organospecific gastric and intestinal antigens, as well as of carcinoembryonic antigen (CEA) was studied by an indirect immune peroxidase method on the sections of fetal stomach, normal definitive stomach, gastric mucosa with features of superficial and deep gastritis, enterolysis and dysplasia, as well as in gastric tumours. Normally, pepsinogen was found to localize in zymogen cells and to disappear in enterolysis and dysplasia of gastric mucosa. Intestinal antigen is absent from the normal mucosa, but is found in all the cases with enterolysis and dysplasia. CEA is most specific for dysplasia of gastric epithelium. In cancers of intestinal type pepsinogen was found in 54%, intestinal (colonic) antigen in 37.5%, CEA in 62.5%. In diffuse type cancers pepsinogen was absent, intestinal antigen was found in 76.9%, CEA in 92% of tumours.