Carcinoembryonic antigen (CEA) was stained by the PAP immunoperoxidase method in cancerous and non-cancerous gastric mucosa of 40 patients (25 non-cancerous dyspeptic patients and 15 patients with gastric carcinoma). The pattern of CEA localization was apical or membranous-cytoplasmic and immuno-reactivity was mild (+), moderate (++) or intensive (+++). No CEA immunoreactivity was detected in normal gastric mucosa whereas it was marked in gastric mucosa of non-cancerous dyspeptic patients with chronic atrophic gastritis and dysplasia (intense). In patients with superficial gastritis and epithelial hyperplasia it was mild or absent. The CEA localization pattern was also apical in non-cancerous dyspeptic patients with microscopic changes, e.g. superficial or chronic atrophic gastritis, epithelial hyperplasia and dysplasia, and in non-cancerous mucosa and cancerous tissue of patients with well (G1) and moderately (G2) differentiated adenocarcinoma.
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