在世界许多地区,结肠癌是种极为常见的肿瘤。然而,该病的发病率却有异乎寻常的地理分布差异。在西北欧洲和美国,结肠癌占肿瘤死因的第2位,而在所谓第三世界国家(南美、非洲和亚洲),结肠癌的年龄调整死亡率却相对低,约为发达国家结肠癌发病率的7%。饮食的地区性差异显然是结肠癌流行病学差别 Colon cancer is a very common type of cancer in many parts of the world. However, the incidence of the disease has an unusually different geographic distribution. In northwestern Europe and the United States, colon cancer accounts for the second leading cause of cancer deaths and in the so-called Third World countries (South America, Africa and Asia), the age-adjusted death rate of colon cancer is relatively low, about the same as the incidence of colon cancer in developed countries Of the 7%. The regional differences in diet are clearly the epidemiological differences in colon cancer