Patients with advanced cancer need to undergo review. Especially when a patient is undergoing anti-tumor treatment such as chemotherapy, targeted drug therapy, immunotherapy, etc., they need to be reviewed at intervals so as to evaluate the current treatment effect and see whether the tumor has grown or shrunk. If the tumor has shrunk, the current treatment regimen can be continued. If the tumor has grown, it means the current treatment is not effective for the patient and a change of treatment regimen should be considered. Even if the tumor shrinks at the beginning of the same treatment regimen, the tumor may become resistant to the drug at the end, and then the regimen may not be effective. Even if the patient’s condition is stable after treatment, regular review is needed to detect the recurrence of tumor and to provide anti-tumor treatment early.