CEA was localized on the luminal surface of normal mucosa, chronic atrophic gastritis, low-grade GIN, and high-grade GIN (Figure 3B, D, F, and 3H), whereas both CEA and CEACAM7 expression was localized to the entire surface of gastric cancerous cells (Figure 3I and 3J). This evidence concerns the gene CEACAM7 and chronic atrophic gastritis.