Introduction: This study aims to evaluate the usability and feasibility of an oral anticancer medication (OAM) adherence app developed in a user-centred design process that incorporates the elements of health behaviour theories. 

Methods: An OAM adherence app (named MedFC) was iteratively developed and evaluated for its usability and feasibility. Patients who self-managed their OAMs or caregivers who were directly involved in helping patients to manage their OAMs were recruited for the usability evaluation of the first (N=15), second (N=10) and third (N=11) versions of MedFC. Usability was measured using the system usability scale (SUS). SUS scores range between 0 and 100, with higher scores indicating better usability. The pilot feasibility evaluation involved participants (N=5) using the third version of MedFC for a minimum of three weeks. Feasibility was evaluated based on the ability of the app to monitor OAM adherence.

Results: The median SUS scores of the first, second and third versions of MedFC were 65 (IQR: 55; 82), 74 (IQR: 65; 75) and 90 (IQR: 80; 95), respectively. Based on a Kruskal-Wallis analysis, there were statistically significant differences between the SUS scores of the first and third versions (p = 0.001), and the second and third versions (p = 0.020) of MedFC. MedFC was able to capture at least 69.0% of the times the patient consumed their medication, and > 80.0% adherence levels were seen in 3 (60.0%) of the participants. 

Conclusions: MedFC was found to be usable and feasible for managing adherence in patients taking OAMs.

09 - USABILITY AND FEASIBILITY OF A THEORY-BASED AND USER-CENTRED ORAL ANTICANCER MEDICATION ADHERENCE APP