研究单位：[1]Sun Yat-sen University[2]First People's Hospital of Foshan[3]Sichuan Cancer Hospital and Research Institute[4]Zhongshan People's Hospital, Guangdong, China
研究目的：
To evaluate whether individualized elective neck irradiation for nasopharyngeal carcinoma based on the vertebral level of metastatic lymph nodes can reduce the incidence of radiation-related adverse effects and improve patients' quality of life，without reducing survival.
