The recurrence rate of lung cancer in situ after resection is extremely low. Lung cancer in situ means that the cancer cells are limited to the epithelial layer and have not formed to the surrounding tissues and basement membrane, which is also known as stage 0 lung cancer. Radical surgery can completely remove the tumor tissues, with a five-year survival rate of more than 95%, or even 100%, and the postoperative recurrence rate is relatively low, which means that the prognosis is relatively ideal. Although the recurrence rate of lung cancer in situ is relatively low, there is still a certain chance of recurrence, therefore, it is still necessary to follow the doctor’s instruction and regularly review the chest CT, tumor markers and other tests, and once abnormalities occur, it is necessary to carry out targeted treatment in time.