AUTHOR=Brochez Lieve , Kruse Vibeke , Schadendorf Dirk , Muller Alexander J. , Prendergast George C. TITLE=Editorial: Targeting Indoleamine 2,3-dioxygenases and Tryptophan Dioxygenase for Cancer Immunotherapy JOURNAL=Frontiers in Immunology VOLUME=12 YEAR=2021 URL=https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2021.789473 DOI=10.3389/fimmu.2021.789473 ISSN=1664-3224