Distinct prognostic values of programmed death-ligand 1 and programmed cell death protein 1 in lung adenocarcinoma and squamous cell carcinoma patients

Shuo Wang, Xiujuan Qu, Zhi Li, Xiaofang Che, Lili Cao, Xianghong Yang, Xuejun Hu, Ling Xu, Kezuo Hou, Yibo Fan, Ti Wen, Yunpeng Liu