Radiotherapy can usually start after 2~7 days after localization. Radiotherapy is one of the important treatment modalities for cancer. Before radiotherapy, it is necessary for doctors to first evaluate whether the patient meets the indications for radiotherapy. For patients who are suitable for radiotherapy, they will firstly do CT and other imaging examinations to accurately locate the tumor, and then do the work of outlining the target area, determining the patient’s radiation therapy dose, and formulating a radiotherapy plan, which will take about 2~7 days. After starting radiotherapy, regular weekly monitoring of blood count, liver and kidney function is also needed to monitor the side effects of bone marrow suppression and gastrointestinal tract caused by radiotherapy, and to observe the skin side effects in the radiotherapy area. Patients are advised to consult the doctor promptly if they have any discomfort, so that treatment can be given in a timely manner.