HHLA2 and PD-L1 co-expression predicts poor prognosis in patients with clear cell renal cell carcinoma
======================================================================================================

* Qiang-Hua Zhou
* Kai-Wen Li
* Xu Chen
* Hai-Xia He
* Sheng-Meng Peng
* Shi-Rong Peng
* Qiong Wang
* Ze-An Li
* Yi-Ran Tao
* Wen-Li Cai
* Ran-Yi Liu
* Hai Huang