AUTHOR= Frontiers Editorial Office TITLE=Retraction: Exosomes derived from microRNA-148b-3p-overexpressing human umbilical cord mesenchymal stem cells restrain breast cancer progression JOURNAL=Frontiers in Oncology VOLUME=14 YEAR=2024 URL=https://www.frontiersin.org/journals/oncology/articles/10.3389/fonc.2024.1422567 DOI=10.3389/fonc.2024.1422567 ISSN=2234-943X