Cancer recurrence is the highest possibility within 5 years after surgery, especially within 2 years after surgery, that’s why it is necessary to review more frequently in 2 years after surgery, once every 3 months, because the probability of recurrence is very high within 2 years, and a review once every 3 months can detect the problem and deal with it in time. Therefore, patients need to be reviewed once every 6 months 2-5 years after surgery. Clinically, if the cancer does not recur within 5 years, it is considered to be clinically cured, so the number of recurrence after 5 years is relatively low and annual review is sufficient.