Carcinoembryonic antigen (CEA) in the gastric mucosa after partial gastrectomy.

Carcinoembryonic antigen (CEA) was studied by the three-layer bridge immunoperoxidase technique in gastric biopsy specimens taken from 49 patients, 13--20 years after partial gastrectomy. Routine histological examination revealed various degrees of chronic atrophic gastritis in all patients. A positive CEA reaction was found in 6 out of 9 with malignant or premalignant mucosal changes and in 4 out of 40 without these changes. In two cases of carcinoma the biopsies revealed a positive CEA reaction. In 4 patients with carcinoma diagnosed 1--2 years after the first examination the initial nonmalignant biopsies were CEA-positive in one case. All biopsies from mucosa with severe dysplasia and adenomatous polyps were CEA-positive. Four patients without malignant or premalignant changes in the gastric mucosa had CEA-positive biopsies. No carcinoma has been found in these patients at re-examinations after 1 year. The results indicate that the occurrence of immunohistochemically detectable CEA may be associated with malignant transformation of the gastric mucosa. The value of this method in screening patients at increased risk of gastric carcinoma will be further explored.