tnm is a common staging method for malignant tumors. Generally speaking, t indicates the size of the tumor volume, n is the regional lymph nodes, and m indicates whether distant metastasis has occurred. t3 refers to the fact that the volume of the sigmoid colon tumor is relatively large and has invaded the pararectal tissues that are covered by the peritoneum. n0 indicates that regional lymph nodes have not been present, and m0 indicates that distant metastasis has not occurred in the sigmoid colon tumor. Accordingly, it can be assumed that t3n0m0 belongs to the early stage of sigmoid colon cancer. Early stage cancer patients are recommended to seek medical treatment immediately and undergo radical surgical resection as prescribed by the doctor, so as to avoid further expansion of the cancer. It should be noted that the cancer may invade the surrounding tissues when the size of the cancer is relatively large, and the patient may have the risk of cancer recurrence after surgery. Early detection, early diagnosis and early treatment are recommended for patients with early stage colon cancer. Meanwhile, receive preventive chemotherapy after surgery to reduce the chance of recurrence.