Gps-Based High-Throughput Screening of Drugs Modulating Tumor Microenvironment - Pd-L1 as Targets for Cancer Immunotherapy (II) = 利用高通量蛋白穩定度藥物篩選技術(GPS)對腫瘤微環境中蛋白調控進行新藥開發 - 以PD-L1免疫治療為例 (II)