As intestinal-type cancer is thought to be preceded by a precancerous stage characterized by the sequential steps of atrophic gastritis, intestinal metaplasia, GINs, and intramucosal carcinoma, it would be of great significance to clarify the dynamic expression of CEACAM7 and CEA in normal gastric mucosa, chronic atrophic gastritis, GINs, and gastric carcinoma. The gene discussed is CEACAM5; the disease is chronic atrophic gastritis.