Higher postoperative plasma EV PD-L1 predicts poor survival in patients with gastric cancer =========================================================================================== * Gaopeng Li * Guoliang Wang * Fenqing Chi * Yuqi Jia * Xi Wang * Quankai Mu * Keru Qin * Xiaoxia Zhu * Jing Pang * Baixue Xu * Guangen Feng * Yuhu Niu * Tao Gong * Hongwei Zhang * Xiushan Dong * Ting Liu * Jinfeng Ma * Zefeng Gao * Kai Tao * Feng Li * Jun Xu * Baofeng Yu