Tumor TNM staging, a commonly used clinical staging for tumors, in which T stands for the condition of the primary tumor itself, N stands for the invasion of the draining lymph nodes, and M stands for the condition of distant metastasis. The T stage in tumor TNM staging includes Tx, which means that the primary tumor cannot be evaluated, T0, which means that no evidence of primary tumor is found, Tis carcinoma in situ, and T1-4, which means that it continues to be divided into four stages according to the size of the primary tumor and the extent of local invasion; N staging included Nx i.e. inability to assess regional lymph node status, N0 i.e. no regional lymph node metastasis, and N1-3 i.e. extent of regional lymph node involvement; M staging includes Mx i.e. inability to assess distant metastases, M0 i.e. absence of distant metastases, and M1 i.e. occurrence of distant metastases. The significance of this staging is to make the same or similar survival as possible for the same tumor cases in the same period of time, while the difference in survival rate between different periods of time is significant. At the same time, the clinical staging can be determined before any anticancer treatment is administered and does not change based on information obtained after treatment, which is important for the selection and evaluation of the initial treatment program. If you are suffering from certain tumors, it is recommended that you undergo TNM staging under the guidance of a professional doctor in a regular hospital to assist in the follow-up treatment and to avoid delays.