Gemcitabine combined with apatinib and toripalimab in recurrent or metastatic nasopharyngeal carcinoma

Rui You, Xiong Zou, Xi Ding, Weijing Zhang, Mengxia Zhang, Xiao Wang, Hanshi Xu, Yong‐Long Liu, Yan‐Feng Ouyang, Chongyang Duan, Chen-Mei Gu, Zhiqiang Wang, You‐Ping Liu, Yi-Jun Hua, Pei Huang, Ming‐Yuan Chen