AUTHOR=Wang Yiting , Shi Hubing , Meng Huan , Xu Jie TITLE=Editorial: Targeting the PD-1/PD-L1 Cancer Immune Evasion Axis: Challenges and Emerging Strategies JOURNAL=Frontiers in Pharmacology VOLUME=11 YEAR=2020 URL=https://www.frontiersin.org/journals/pharmacology/articles/10.3389/fphar.2020.591188 DOI=10.3389/fphar.2020.591188 ISSN=1663-9812