胃癌是常见的恶性肿瘤,居消化道肿瘤死亡的第一位。我国胃癌地区分布的特点是北方比南方高,某些沿海地区比内地高。青海、宁夏、甘肃等西北高原和河西走廊为胃癌的高发区,东南沿海的江苏、上海、浙江、福建和辽东半岛也是高发区,而广东、广西、云贵高原则为低发区。从年龄看,55 Gastric cancer is a common malignancy, ranking first in the death of digestive tract cancer. The distribution of gastric cancer in China is characterized by the fact that the north is higher than the south, and some coastal areas are higher than the mainland. The Northwest Plateau and Hexi Corridor such as Qinghai, Ningxia and Gansu are high incidence areas of gastric cancer. Jiangsu, Shanghai, Zhejiang, Fujian, and Liaodong Peninsula on the southeast coast are also high-incidence areas, while Guangdong, Guangxi, and Yungui High are low-risk areas. In terms of age, 55