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Background  The significance of carcinoembryonic antigen-related cell adhesion molecule 7 (CEACAM7) expression in gastric carcinoma and precancerous lesions and its correlation with CEA expression has rarely been previously investigated.    Methods  CEACAM7 and CEA expression was detected by immunohistochemistry in consecutive sections of 345 subjects with gastric carcinoma and precancerous lesions. Laser confocal analysis was performed to determine CEACAM7 and CEA localization. Correlation between CEACAM7 and CEA expression with clinicopathological parameters was statistically analyzed.    Results  CEACAM7 expression correlated with pathologic grading (P = 0.006), Lauren's classification (P = 0.023), and CEA expression (Spearman R = 0.605, P < 0.001) in gastric carcinoma. CEACAM7 co-localized with CEA predominantly in the cytoplasmic membrane of cancerous cells. CEA expression was correlated with lymph node metastasis (P = 0.031). CEACAM7 and CEA expression increased progressively from precursor lesions to gastric carcinomas. A combination of CEACAM7 and CEA expression was determined to be an independent predictor for patients with gastric carcinoma by multivariate analysis (P = 0.001).    Conclusions  CEACAM7 expression correlates with tumor differentiation and CEA expression in gastric carcinoma. CEACAM7 and CEA expression may synergistically promote gastric carcinogenesis. Combined CEACAM7 and CEA expression analysis can be a useful postoperative predictor for patients with gastric carcinoma.

Dynamic expression of CEACAM7 in precursor lesions of gastric carcinoma and its prognostic value in combination with CEA