AUTHOR=Tang Yuxia , Yu Meihua , Su Xiaodan , Teng Zhaogang , Wang Shouju TITLE=Editorial: Enhancing Drug Delivery and Tumor Penetration JOURNAL=Frontiers in Oncology VOLUME=11 YEAR=2021 URL=https://www.frontiersin.org/journals/oncology/articles/10.3389/fonc.2021.775001 DOI=10.3389/fonc.2021.775001 ISSN=2234-943X