If the tumor is detected early and can be completely removed, it is likely to be cured. However, if the tumor is already in the middle or late stage when it is detected, the chance of surgical resection has been lost, so we can only try to control the tumor and prolong life. Small cell lung cancer is the most malignant of all lung cancers, and the median survival time is often about 0.5 years in the late stage. Even if surgery is not possible, chemotherapy and radiotherapy can prolong the life of patients, especially for lung adenocarcinoma, if there is a genetic mutation in the genetic test, it is suitable for oral targeted drug therapy, and even long-term survival can be achieved if the effect is good.