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PURPOSE: Medication nonadherence is common among patients with breast cancer (BC) and increases BC mortality and complications from comorbidities. There is growing interest in mobile health interventions such as smartphone applications (apps) to promote adherence. METHODS: Use of Medisafe, a medication reminder and tracking app, was tested over 12 weeks among patients on BC treatment and at least one oral medication. Study participants were instructed to generate adherence reports every 4 weeks through Medisafe and were deemed to have completed the intervention if >50% of reports were generated. The primary end point was feasibility of the intervention, defined as a completion rate of ≥75% of consented patients. Secondary end points included changes in self-reported nonadherence from baseline to 12 weeks and patient-reported outcomes including reasons for nonadherence and satisfaction with Medisafe. We conducted univariable and multivariable analyses to evaluate demographic and clinical factors associated with intervention completion. RESULTS: Among 100 patients enrolled, 78 (78.0%) completed the intervention. Age, race, ethnicity, clinical stage, and type of medication were not associated with odds of intervention completion. Self-reported nonadherence rates did not improve from baseline to postintervention in the overall study population. However, among patients with self-reported nonadherence at baseline, 26.3% reported adherence postintervention; these patients frequently reported logistical barriers to adherence. Study participants reported high levels of satisfaction with Medisafe, noting that the app was highly functional and provided high-quality information. CONCLUSION: Smartphone apps such as Medisafe are feasible and associated with high patient satisfaction. They may improve adherence in nonadherent patients and those who face logistical challenges interfering with medication-taking. Future trials of mobile health interventions should target patients at high risk for medication nonadherence.
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BACKGROUND: Colon cancer incidence is rising in low- and middle-income countries (LMICs), where resource limitations and cost often dictate treatment decisions. In this study, we evaluate the cost-effectiveness of adjuvant chemotherapy for high-risk stage II and stage III colon cancer treatment in South Africa (ZA) and illustrate how such analyses can inform cancer treatment recommendations in a LMIC. METHODS: We created a decision-analytic Markov model to compare lifetime costs and outcomes for patients with high-risk stage II and stage III colon cancer treated with three adjuvant chemotherapy regimens in a public hospital in ZA: capecitabine and oxaliplatin (CAPOX) for 3 and 6 months, and capecitabine for 6 months, compared to no adjuvant treatment. The primary outcome was the incremental cost-effectiveness ratio (ICER) in international dollars (I$) per disability-adjusted life-year (DALY) averted, at a willingness-to-pay (WTP) threshold equal to the 2021 ZA gross domestic product per capita (I$13,764/DALY averted). RESULTS: CAPOX for 3 months was cost-effective for both patients with high-risk stage II and patients with stage III colon cancer (ICER = I$250/DALY averted and I$1042/DALY averted, respectively), compared to no adjuvant chemotherapy. In subgroup analyses of patients by tumor stage and number of positive lymph nodes, for patients with high-risk stage II colon cancer and T4 tumors, and patients with stage III colon cancer with T4 or N2 disease. CAPOX for 6 months was cost-effective and the optimal strategy. The optimal strategy in other settings will vary by local WTP thresholds. Decision analytic tools can be used to identify cost-effective cancer treatment strategies in resource-constrained settings. CONCLUSION: Colon cancer incidence is increasing in low- and middle-income countries, including South Africa, where resource constraints can impact treatment decisions. This cost-effectiveness study evaluates three systemic adjuvant chemotherapy options, compared to surgery alone, for patients in South African public hospitals after surgical resection for high-risk stage II and stage III colon cancer. Doublet adjuvant chemotherapy (capecitabine and oxaliplatin) for 3 months is the cost-effective strategy and should be recommended in South Africa.