Clinical tumor cure is based on five-year survival rate, and bowel cancer mainly refers to colorectal cancer, and the five-year survival rate of stage II patients is around 80%. Colorectal cancer is a common lesion in the digestive system. Combined with the invasion scope of the lesion, it is mainly divided into four stages: Stage Ⅰ primary tumor is only confined to the intramucosal or submucosal layer, without lymph node metastasis and distant metastasis. Stage II primary tumor mainly invades the muscular layer of the intestinal wall, penetrates the intestinal wall, invades the plasma membrane or extra-plasma membrane, without lymphatic metastasis and distant metastasis. In stage III, there are regional lymph node metastases, but no distant metastases. Stage IV has distant metastasis or metastasis invading neighboring organs, such as liver, lung, bone and brain, which cannot be surgically removed. From the staging stage, stage II patients are still in the early stage of the lesion, the lesion is relatively limited, and no metastasis has occurred for the time being. If the lesion is diagnosed, active surgical treatment can reduce the chance of recurrence and metastasis through radical surgery to remove the lesion and clear the lymph nodes around the lesion. After surgery, the disease will be further analyzed through pathological examination, immunohistochemistry, genetic testing and other examination items. Follow-up radiotherapy, targeted drug therapy and other measures are then carried out to consolidate the effect of surgery. The five-year survival rate after surgery is around 80%.