AUTHOR=Kok Victor C. , Yu Cheng-Chia , Salvador Jorge A.R. TITLE=Editorial: Head & Neck Cancer and Esophageal Cancer: From Biosignatures to Therapeutics JOURNAL=Frontiers in Oncology VOLUME=11 YEAR=2021 URL=https://www.frontiersin.org/journals/oncology/articles/10.3389/fonc.2021.666103 DOI=10.3389/fonc.2021.666103 ISSN=2234-943X