大肠癌是最常见的恶性肿瘤之一,在各个国家和地区发病率存在差异,美国和欧洲的发病率较高,亚洲较低。目前大肠癌占全世界癌症发病的第3位,且全球大肠癌发病率仍以2%的速度递增。我国大肠癌发病率近些年以较快的速度增加,尤以大城市为显,引起人们高度重视。在欧美大肠癌死亡率高 Colorectal cancer is one of the most common malignant tumors, with morbidity differences in various countries and regions. The incidence in the United States and Europe is higher, and in Asia is lower. Currently, colorectal cancer accounts for the third highest incidence of cancer in the world, and the incidence of global colorectal cancer is still increasing at a rate of 2%. The incidence of colorectal cancer in China in recent years at a faster rate, especially in large cities, aroused great attention. Colorectal cancer in Europe and the United States high mortality