AUTHOR=Lange-Drenth Lukas , Willemer Hellena , Banse Mirjam , Ernst Anke , Daubmann Anne , Holz Anja , Bleich Christiane , Weg-Remers Susanne , Schulz Holger TITLE=Development and effectiveness evaluation of an interactive e-learning environment to enhance digital health literacy in cancer patients: study protocol for a randomized controlled trial JOURNAL=Frontiers in Digital Health VOLUME=7 YEAR=2025 URL=https://www.frontiersin.org/journals/digital-health/articles/10.3389/fdgth.2025.1455143 DOI=10.3389/fdgth.2025.1455143 ISSN=2673-253X