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食管贲门癌的致病原因中,环境因素占有很重要的位置。世界上食管贲门癌死亡率在地理分布上很不平衡,我国华北地区则以太行山中南段三省交界处发病率最高。其中河北省涉县食管贲门癌粗死亡率居全国之冠。同时,高发区的羊、鸡也患此病,特别是鸡咽
In the cause of esophageal and cardiac cancer, environmental factors occupy a very important position. The mortality rate of esophageal and cardia cancers in the world is geographically unbalanced. In North China, the incidence rate of the three provinces in the middle and south section of Taihang Mountain is the highest. Among them, the crude death rate of esophageal cardia cancer in She County, Hebei Province ranks first in the country. At the same time, goats and chickens in high-risk areas also suffer from this disease, especially chicken pharynx.