AUTHOR=Yoon Sungpil , Wang Xiaoju , Vongpunsawad Sompong , Tromp Gerard , Kuivaniemi Helena TITLE=Editorial: FDA-Approved Drug Repositioning for P-Glycoprotein Overexpressing Resistant Cancer JOURNAL=Frontiers in Oncology VOLUME=11 YEAR=2021 URL=https://www.frontiersin.org/journals/oncology/articles/10.3389/fonc.2021.632657 DOI=10.3389/fonc.2021.632657 ISSN=2234-943X