As for the time interval of interventional treatment, generally speaking, the second time is performed about one month after the first time, and the interval of the third time can be extended appropriately, with an interval of 2-3 months, and the interval after the third time is best based on the follow-up results. If there is clear survival or suspicion of recurrence at the follow-up, the decision to perform interventional or other treatments will be made according to the situation. The practice of performing interventions at prescribed intervals without regard to the condition should be avoided.