Metastasis of nasopharyngeal carcinoma: What we know and do not know Ling-Ling Guo, Hai-Yun Wang, Li-Sheng Zheng, Ming-Dian Wang, Yun Cao, Yang Li, Zhi-Jie Liu, Li-Xia Peng, Bi-Jun Huang, Jian-Yong Shao and Chao-Nan Qian Vis Cancer Med, 2 (2021) 4 Published online: 11 August 2021 DOI: 10.1051/vcm/2021003