AUTHOR= Frontiers Editorial Office 

TITLE=Retraction: Exosomal MicroRNA-221-3p Confers Adriamycin Resistance in Breast Cancer Cells by Targeting PIK3R1

JOURNAL=Frontiers in Oncology

VOLUME=11

YEAR=2021

URL=https://www.frontiersin.org/journals/oncology/articles/10.3389/fonc.2021.839904

DOI=10.3389/fonc.2021.839904

ISSN=2234-943X