AUTHOR=El Saadany Tämer , Lorch Anja , Milowsky Matthew J., Vogl Ursula M., Cathomas Richard TITLE=PD-L1 expression and correlation with outcome in muscle-invasive and metastatic urothelial carcinoma: review and critical discussion JOURNAL=Frontiers in Oncology VOLUME=14 YEAR=2024 URL=https://www.frontiersin.org/journals/oncology/articles/10.3389/fonc.2024.1427452 DOI=10.3389/fonc.2024.1427452 ISSN=2234-943X