RT Journal Article SR Electronic T1 Usability of a Reminder App that May Help to Reduce Radiotherapy-related Skin Toxicity in Patients With Breast Cancer JF In Vivo JO In Vivo FD International Institute of Anticancer Research SP 1768 OP 1775 DO 10.21873/invivo.14329 VO 40 IS 3 A1 RADES, DIRK A1 DZIGGEL, LIESA A1 NARVAEZ-WOLF, CARLOS A. A1 RADTKE, MAIKE A1 STAACKMANN, CHRISTIAN A1 HOLM, HANNE SPANGSBERG A1 KRISTIANSEN, CHARLOTTE YR 2026 UL http://iv.iiarjournals.org/content/40/3/1768.abstract AB Background/Aim: Patients irradiated for breast cancer may experience acute skin toxicity. To reduce this risk, a mobile application was created which reminds patients to carry out skin care. Before using this app in patients, a pre-study evaluating its usability in healthy volunteers was required.Patients and Methods: In this prospective study, 30 healthy volunteers from Germany and Denmark were asked to test the app and complete a questionnaire including ten statements (“yes or “no”) in three sections.Results: Satisfaction rates (statements affirmed with “yes”) were 66.7% (18/27 participants) and 78.6% (22/28) in the section “download and installation”, and 100% (29/29) and 96.7% (29/30) in the section “navigation”. In the section “content/functions”, the six statements were addressed by 28-30 participants; satisfaction rates were 86.7% to 100% (median 96.5%). Dichotomous responses were supplemented by individual comments.Conclusion: This study revealed that the reminder app needed improvement before tested in patients and demonstrated the importance of a pre-study in healthy volunteers.