Dynamic monitoring of serum soluble programmed cell death ligand 1 as a response predictor to chemotherapy in metastatic or recurrent gastrointestinal cancer - Sun, Jin; Qiu, Miao-Zhen; Mei, Ting; Gao, Yuan; Chang, Boyang; Zhang, Yuxin; Wang, Feng-Hua; Li, Su (Translational Cancer Research, 2020)