A comparison between the sixth and seventh editions of the UICC/AJCC staging system for nasopharyngeal carcinoma in a Chinese cohort. oleh Jing Li, Xiong Zou, Yun-Long Wu, Jing-Cui Guo, Jing-Ping Yun, Miao Xu, Qi-Sheng Feng, Li-Zhen Chen, Jin-Xin Bei, Yi-Xin Zeng, Ming-Yuan Chen