The severity of lung adenocarcinoma depends on the early or late stage, as follows: 1. If early lung cancer is detected in time to do radical lung cancer surgery, including lobe resection and mediastinal lymph node resection, and then adjuvant chemotherapy after surgery according to pathological manifestations; 2. If lymph node metastasis appears, and then adjuvant radiotherapy, the patient’s prognosis is still very good at this time; 3. If local detection is late, or even distant metastasis has appeared, the treatment can only However, it can be treated as a chronic disease because medical progress in lung cancer is still very great. With the emergence of some new treatment methods, such as targeted therapy and even immunotherapy, the prognosis of the whole patient is still very good. The median survival of patients with advanced lung cancer can even reach more than 4 years, so there is no need to be too alarmed. Once lung adenocarcinoma is diagnosed, it is recommended to do genetic testing, including EGFR, ALK and ROS1 testing in a timely manner. If there are mutations or positive driver genes, the current guidelines are to promote targeted therapy, which can significantly prolong the survival of patients. Immunotherapy, which has been hotter in recent years, is also relatively fast in lung cancer treatment and development. Studies have found that for PD-L1, if it is highly expressed, immunotherapy is very effective and even preferred if PD-L1 > 50%. If chemotherapy is preferred, chemotherapy combined with immunotherapy can also be chosen in the first line.