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Usability of a Reminder App that May Help to Reduce Radiotherapy-related Skin Toxicity in Patients With Breast Cancer

Dirk Rades^1,2, Liesa Dziggel², Carlos A Narvaez-Wolf²

¹Department of Radiation Oncology, University of Lübeck, Lübeck, Germany; dirk.rades@uksh.de.

In Vivo (Athens, Greece)

|April 28, 2026

Abstract

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.

Keywords:

Breast cancer acute skin toxicity healthy volunteers radiotherapy reminder app

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