It is not true that there is no recurrence of lung cancer after 5 years, but it is important to clarify the concept that 5-year survival rate is often used in medicine for tumor survival, because in terms of medical follow-up period, the longest statistical survival of cancer after surgery and other treatments is 5 years, which depends on the follow-up time, manpower and cost. In the past, it was thought that if the surgery did not cut cleanly, then how about after growth, 5 years of time should grow out, there should have been tumor recurrence, and if it does not grow out after 5 years, it may also be thought that there is no clinical lesion. With the deeper understanding of molecular biology of tumor, even if the patient feels that the lesions have been cut cleanly or have improved after treatment, the mutation of oncogenic driver gene in the body may always exist and cannot be changed, so there is still a possibility of recurrence or metastasis after 5 years. However, it is still important to have regular checkups and not to let down your guard completely.