The Effects of a Nurse-led MHealth Program for Symptom Self-management of Breast Cancer Patients Undergoing Chemotherapy

Strategies Used by People to Promote Health (SUPPH) is a health promotion strategy questionnaire, developed to evaluate the confidence of cancer patients in self-managing their disease, on the basis of expert consultations, patient interviews, and literature research. The original scale has 29 items and uses a 5-point Likert scale, from 1, indicating no confidence to 5, indicating extremely confident. High scores indicate a high level of self-efficacy on the part of the participants. The Chinese version of the SUPPH was adapted by Qian & Yuan and the Cronbach's α coefficient of the total scale is 0.970 . SUPPH will be collected at baseline (week 0), week 3 and at the end of the study (week 6) using self-reported questionnaires handed out through the Breast Health Centre's official WeChat.

The intervention acceptability and usability will be tested by a self-report questionnaire, the System Usability Scale, after completing the study (week 6).

General quality of life has been used as a prominent measurement to reflect the outcome of a treatment. Functional Assessment of Cancer Therapy-Breast (FACT-B) is selected, since it is a HRQoL instrument specific to BC patients. FACT-B is divided into five subscales, namely, physical well-being, social/family well-being, emotional well-being, functional well-being, and additional concerns. Higher scores indicate a better QOL on the part of the participants. Wan et al. reported that the internal consistency of most domains in the simplified Chinese version of FACT-B ranged from 0.82 to 0.85. FACT-B will be collected before chemotherapy (baseline), week 3 and at the end of the study (week 6) using self-reported questionnaires handed out through the Breast Health Centre's official WeChat.

The Memorial Symptom Assessment Scale-Short Form (MSAS-SF) is an instrument that can be used to measure BC patient symptoms of distress. This questionnaire is composed of three dimensions: the Physical Symptom dimension (PHYS), the Psychological Symptom dimension (PSYCH), and a Global Distress Index (GDI). It includes 28 items on distress and frequency in the physical symptom dimension and four items in the psychological symptom dimension during the past week. Higher scores mean more frequency, greater severity and higher distress. The simplified Chinese version of the Memorial Symptom Assessment Scale-Short Form (MSAS-SF-SC) has been found to be reliable, with Cronbach's alpha coefficients for the subscales ranging from 0.782 to 0.874. MSAS-SF will be collected at week 3 and at the end of the study (week 6) using self-reported questionnaires handed out through the Breast Health Centre's official WeChat.

Chemotherapy-induced healthcare utilisation for six weeks will be recorded in the pilot study for analysis. Three types of healthcare utilisation will be collected: patient-initiated hotline calls, unplanned visits to the ambulatory clinic, and unscheduled visits to the emergency department. These records of healthcare service will be obtained from the statistics centre of the study hospital.

Data on an individual's six weeks of usage, including log-in frequency and duration of usage of the whole mChemotherapy program, are tracked in the WeChat statistics module of the background thread. Log-in frequency is recorded as the number of times a participant logged into the app for six weeks. The total duration of usage is recorded as the sum of all times in minutes between logging in and logging out.