Sigmoid colon malignant tumor without surgery, but can be timely radiotherapy to inhibit cancer cells, 5-year survival rate is about 50%. If it develops to the advanced stage, has metastasized around the organs, spreads, and can not do the surgery, after the regular treatment, the survival rate in 5 years is about 25%-48%. If early sigmoid colon cancer, without surgery, if can carry out radiotherapy in time to inhibit the cancer cells and prevent the cancer cells from spreading to other organs after metastasis, the survival rate is relatively high, and the survival rate within 5 years can reach about 50%, maybe even longer. However, if the disease has already developed to the middle or advanced stage, and the cancer cells start to metastasize and spread, such as through liver metastasis, lymph node metastasis, etc., the survival rate of this kind of patients is relatively low, and the survival rate can reach about 25%-48% within 5 years, depending on the individual’s situation and the effect of treatment. If malignant tumor of sigmoid colon is detected, it is recommended to consult the doctor in time, and carry out surgery in time if surgery can be done, which can prolong the survival rate of the patients, improve the quality of life, and avoid delaying the condition.