According to the 8th edition of UICC staging standard, TNM staging of cancer: T refers to the size of the largest diameter of the primary tumor and the surrounding invasion; N refers to regional lymph node metastasis; M refers to distant metastasis; According to different TNM staging, it corresponds to stage I, II, III and IV of cancer, and the staging methods of different tumors are different. Take lung cancer as an example: Occult cancer: TisN0M0 Stage I: T1-2aN0M0 Stage II: T2b-3N0M0, T1-2bN1M0 Stage III: T1-4N2-3M0, T3-4N1M0, T4N0M0 Stage IV: T1-4N0-3M1 The specific staging of tumors is an international uniform regulation, and different tumors have different specifics. Staging is a basis to guide oncologists to treat tumors, and you need to consult a professional doctor for specifics.