Feasibility and usability
NPS, breast cancer
DISEASE, BREAST CANCER
Integration of the Outcomes4Me app into the routine care of patients with breast cancer in active treatment was deemed feasible with 60% of participants engaging with the app at least 3 times during the study period, exceeding the prespecified target of 40%. There was wide variation in the level of engagement with the app during the study period among all participants, as shown in Fig. Patient Engagement with Outcomes4Me App. The distribution of individual patient engagement for all 107 patients during the study period is shown. Orange line denotes patients who engaged 3 or more times with the app; green line denotes patients who engaged 4 or more times with the appThe mean usability score, as demonstrated by the SUS was 70 (median 76), exceeding the threshold for “above average” usability of 68 [The overall NPS was − 37, suggesting 37 more detractors (respondents with a score of 0–6 on 10-point scale of willingness to recommend the app to other patients) then promotors (respondents with a score of 9 or 10) out of 100 app user. While the ratio of promotors to detractors of the app increased among more frequent users, the NPS was still negative, at—28 among those who engaged with the app 5 times or more, compared to − 41 among those who were less engaged. Among patients receiving adjuvant chemotherapy the NPS was balanced, with a score of 0 (promotors equal detractors). Tendency to promote the app, based on NPS, seemed to vary with stage with an NPS score of—47 among patients with stage I disease (