The staging method of lung cancer adopts tnm staging, rather than the usual early, middle and late stages. Incomplete information, such as cancer university, relationship with trachea, specific lymph nodes of mediastinal metastasis, etc. , so it is impossible to clearly stage. Staging TNM staging system of non-small cell lung cancer (also known as American Joint Cancer Committee System (AJCC)) is most commonly used to describe the growth and spread of non-small cell lung cancer (NSCLC). In TNM staging, information about tumor, nearby lymph nodes and distant organ metastasis is combined, and staging is used to refer to a specific TNM grouping. The grouping stage is described by the number 0 and Roman numerals I to IV. T stands for tumor (its size and degree of spread in lung and adjacent organs), N stands for lymph node spread, and M stands for metastasis (spread to distant organs). T-staging of non-small cell lung cancer: T-staging is based on the size of lung cancer, its spread and location in the lung, and its spread to adjacent tissues. L Tis: cancer is confined to the inner cells of the airway. Without spreading to other lung tissues, this stage of lung cancer is usually called carcinoma in situ. L T 1: The tumor was less than 3cm (slightly less than 1 1/4 inches), and it did not spread to the visceral pleura (the membrane surrounding the lung) and the main bronchus. L T2: Cancer has one or more of the following characteristics: L > 3cml involves the main bronchus, but it is more than 2cm (about 3/4 inch) away from the carina (where the trachea is divided into the left and right main bronchus). Cancer that spreads to the visceral pleura partially blocks the airway, but does not cause lung collapse or pneumonia. L T3: Cancer has one or more of the following characteristics: L has spread to the chest wall, diaphragm (the respiratory muscle that separates the chest and abdomen), mediastinal pleura (the membrane that wraps the space between the two lungs) or parietal pericardium (the membrane that wraps the heart). L involves a main bronchus, less than 2 cm (about 3/4 inch) from the carina (trachea is divided into left and right main bronchus here), but does not include carina. L has grown long enough to cause lung collapse or pneumonia. L T4: Cancer has one or more of the following characteristics: L spreads to the mediastinum (the space behind the sternum and in front of the heart), heart, trachea, esophagus (the tube connecting the larynx and stomach), spine or carina (the trachea is divided into left and right main bronchi here). L There are two or more independent tumor nodules in the same lobe. There is malignant pleural effusion (the fluid around the lungs contains cancer cells). N staging of non-small cell lung cancer: N staging depends on which lymph nodes the cancer has invaded nearby. L N0: The cancer has not spread to lymph nodes l N 1: The lymph nodes where the cancer has spread are only in the lung and hilar lymph nodes (around where the bronchus enters the lung). Metastatic lymph nodes are confined to the same side of the affected lung. N2: The cancer has spread to carina lymph nodes (around the position where the trachea divides into left and right bronchi) or mediastinal lymph nodes (the space behind the sternum and in front of the heart). The involved lymph nodes are limited to the same side of the affected lung. N3: The cancer has spread to the ipsilateral or contralateral supraclavicular lymph nodes, and/or the contralateral hilar or mediastinal lymph nodes of the affected lung. Table 1: Non-small cell lung cancer is divided into groups, stages, comprehensive stages, T stages, N stages, M stages, 0 stages, Tis (carcinoma in situ), N0M0IA, T 1N 1M0IIB, T 3n 1n 0 m0iiia, T. M0M0IIIB stage any TT4N3 stage any NM0M0IV stage any T NM 1 non-small cell lung cancer M stage: M stage depends on whether the cancer has metastasized to distant tissues or organs. M0: No long-distance diffusion. L M 1: Cancer has spread to one or more distant sites. The distant part includes other lung lobes, lymph nodes beyond the above N stage, and other organs or tissues, such as liver, bone or brain. Staging and grouping of non-small cell lung cancer: Once T, N and M stages are defined, the comprehensive staging of stage 0, I, II, III or IV can be defined after comprehensive information (see table 1). Patients with lower stages have better survival prospects. Staging of small cell lung cancer Although small cell lung cancer can be staged like non-small cell lung cancer, most doctors find that a simpler two-stage system is better in treatment selection. The system divides small cell lung cancer into "localized stage" and "extensive stage" (also known as divergent stage). L Limited time means that the cancer is confined to one lung and the lymph nodes are only located in the same chest. If the cancer spreads to another lung, or the contralateral thoracic lymph nodes, or distant organs, or malignant pleural effusion surrounds the lung, it is called extensive stage.