AUTHOR=Editorial Office Frontiers TITLE=Retraction: pH responsive polymer micelles enhances inhibitory efficacy on metastasis of murine breast cancer cells JOURNAL=Frontiers in Pharmacology VOLUME=14 YEAR=2023 URL=https://www.frontiersin.org/journals/pharmacology/articles/10.3389/fphar.2023.1252186 DOI=10.3389/fphar.2023.1252186 ISSN=1663-9812