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一、发病情况大肠癌为常见的恶性肿瘤之一。在经济发达的国家,如北美、西欧等国大肠癌往往为第一、二位常见的内脏癌症,年发病率高达25～50/10万。但在发展中国家,如印度、塞内加尔、哥伦比亚等国大肠癌却少见,年发病率仅2～8/10万。大肠癌在我国各地常见恶性肿瘤中大致为第4～6位。长江下游与东南沿海的上海、江苏、浙江、福建、台湾及香港为高发区。内蒙、东北及华北的部分地区发病率也较高。据1973～1975年全国恶性肿瘤死亡率调查,全国每年死于大肠癌的病人占全部恶性
First, the incidence of colorectal cancer is one of the common malignant tumors. In developed countries, such as North America, Western Europe and other countries, colorectal cancer is often the first and the most common visceral cancer, with an annual incidence of 25 to 50 per 100,000. However, in developing countries, such as India, Senegal, Colombia and other countries, colorectal cancer is rare but the annual incidence rate is only 2 to 8 per 100,000. Colorectal cancer is generally ranked 4th to 6th among common malignancies throughout China. The lower reaches of the Yangtze River and the southeast coast of Shanghai, Jiangsu, Zhejiang, Fujian, Taiwan and Hong Kong are high-risk areas. The incidence is also high in parts of Inner Mongolia, northeast and north China. According to the National Cancer Mortality Survey from 1973 to 1975, all patients who died of colorectal cancer in the country accounted for all the malignant