Tumors are mostly diagnosed in the middle to late stages and require the implementation of comprehensive treatment, i.e., the combination of several therapeutic means. This is because after the tumor has grown to a certain volume, many micro-metastases have occurred, which cannot be detected by current scientific and technological means. The American Cancer Society, through a retrospective analysis of whether postoperative patients have done adjuvant radiotherapy, pointed out that: cancer patients with postoperative adjuvant radiotherapy, recurrence and metastasis rates are significantly reduced! Furthermore, cancer is invasive, invading the surrounding normal tissues like a tree root growing into the soil, and surgery is often not able to remove enough of the surrounding organs, so it is difficult to completely remove the tumor, so it is necessary to use adjuvant radiotherapy to kill the remaining cancer cells. Of course, it is not that all tumors have to be operated, only that the existence of surgery has a history of more than 2,000 years, while radiotherapy only has a history of nearly 100 years, and the real development is only in the last 20 years, people do not understand the efficacy of radiotherapy in treating tumors and are not sure that they think the tumor will be finished after surgical resection. As a matter of fact, radiotherapy is the first choice of treatment for nasopharyngeal cancer, and the cure rate is very high. Like laryngeal cancer, lip cancer, cervical cancer, etc., simultaneous radiotherapy can achieve the same efficacy as surgery, and can preserve organ function. Some inoperable patients are not equal to “hopeless”, after internal medicine treatment, they may still be able to survive for quite a long time. Before surgery, some patients can use radiation therapy to shrink the tumor to achieve the purpose of lowering the stage and grade of the tumor, so that it is easy to be removed.