The survival time of mid-stage nasopharyngeal carcinoma is very long. Some studies have shown that the 5-year survival rate of mid-stage nasopharyngeal carcinoma can reach 50%-75% after treatment, which means about 50%-75% of patients with mid-stage nasopharyngeal carcinoma can survive for 5 years or even longer, which is a relatively long survival time for human malignant tumors. The survival time of mid-stage nasopharyngeal carcinoma is also related to the local control rate. The larger the primary tumor is, especially for patients who invade the brain nerve and skull base bone destruction, the lower the local control rate will be and the lower the 5-year survival rate will be. In addition, there is also a relationship with lymph node metastasis in the neck. The larger and lower the location of lymph nodes, the more distant metastasis rate will be, and the prognosis of patients will be worse.