CEACAM5 and neoplasm: Table 1 shows the results for a comparison of the clinical and pathologic features between the patients in Group A and Group B. Of the patients in Group A, neoplasms were more frequently located in the upper stomach (37.8% vs 18%), and a more advanced pN classification(N2/N3) was observed while a more lower pN classification(N0/N1) was seen in group B. Before surgery, patients who were negative for H.Pylori had higher concentrations of carcinoembryonic antigen(CEA) than did those who were positive for H.Pylori.