大肠癌是欧美等发达国家多发的恶性肿瘤，占恶性肿瘤总发病率的第二位；即使在大肠癌发病较少的亚洲、非洲等发展中国家，其中也包括我国在内，大肠癌的发病率近年亦有明显的上升趋势。虽然如此，但大肠癌的治疗效果，目前仍停留在７０年代的水平。影响大肠癌疗效的因素很多， Colorectal cancer is a malignant tumor that frequently occurs in developed countries such as Europe and the United States and accounts for the second highest incidence of malignant tumors. Even in developing countries with low incidence of colorectal cancer, such as Asia and Africa, including China, the incidence of colorectal cancer The rate has also shown a clear upward trend in recent years. Even so, the therapeutic effect of colorectal cancer remains at the level of the 1970s. There are many factors that affect the efficacy of colorectal cancer.