CEACAM5 and neoplasm: In Highly-infected patients, the N staging had an earlier stage(N0/N1) and tumor sites in upper stomach were found, while the CEA level was unrelated to the H.Pylori copies number; and 3) the overall survival and relapse-free survival in patients with positive H.Pylori status had no significant difference from the patients with negative H.Pylori status; and in H.Pylori positive patients, prognosis was better in those with high copies number of H.Pylori than in those with lower copies number, but the result was no significant statistical difference.