AUTHOR=La Rosa Stefano , Rubbia-Brandt Laura , Scoazec Jean-Yves , Weber Achim TITLE=Editorial: Tumor Heterogeneity JOURNAL=Frontiers in Medicine VOLUME=6 YEAR=2019 URL=https://www.frontiersin.org/journals/medicine/articles/10.3389/fmed.2019.00156 DOI=10.3389/fmed.2019.00156 ISSN=2296-858X