一、化学预防胃癌中由幽门螺杆菌(Hp)感染胃粘膜而发生者占绝大多数,提示Hp感染与胃癌的发生进展具有密切相关,这一点是明确的。然而,在胃癌的成因上,又同环境因素、社会经济条件以及生活习惯等多种因子相关,其中Hp感染是最为重要的构成因素。作为胃癌的危险因子,除了Hp外,还报 First, the chemical prevention of gastric cancer by Helicobacter pylori (Hp) infection of the gastric mucosa accounted for the vast majority, suggesting that Hp infection is closely related to the progress of gastric cancer, which is clear. However, in the cause of gastric cancer, but also with environmental factors, socio-economic conditions and habits and other factors related to Hp infection is the most important constituent factor. As a risk factor for gastric cancer, in addition to Hp, also reported