The survival rate of early stage lung adenocarcinoma after resection is relatively high, generally more than 80% of patients can get 5 years or more survival time. Early stage adenocarcinoma of the lung generally refers to stage I adenocarcinoma of the lung and adenocarcinoma in situ. According to the principle of lung cancer treatment, early stage adenocarcinoma of the lung is preferred to be resected by radical surgery, and the chances of recurrence are relatively low after the surgery, so the five-year survival rate of patients with early stage adenocarcinoma of the lung after the surgery can reach more than 80%, that is to say, more than 80% of patients can have a long term survival. However, once early lung adenocarcinoma develops to intermediate or advanced stage, the proportion of patients who can get radical surgical resection is relatively low, and the chance of recurrence and metastasis increases, which makes the proportion of patients who can be cured decrease, and thus the survival rate of patients also decreases significantly.