Canada's Study of Adherence Outcomes in Patients Receiving Adalimumab: 3-year Results From the COMPANION Study
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PURPOSE: The aim of this study was to quantify the association between receiving care-coach calls (CCCs), a service provided by a patient-support program (PSP) in Canada, and persistence with and adherence to adalimumab therapy over a 3-year period in patients with immune-related inflammatory diseases (IMID). METHODS: COMPANION, a longitudinal, retrospective cohort study, was conducted using patient-level data from the PSP combined with those from a longitudinal pharmacy-transaction database in patients initiating adalimumab therapy between 2010 and 2012. Patients aged ≥18 years who were naive to adalimumab therapy were selected, and data from their prescriptions from 36 months or until drug discontinuation, defined as >90 days without drug supply, were evaluated. Cox proportional hazards modeling was used to estimate hazard ratios for the association between persistence, and patient characteristics and PSP services. Adherence was measured using the medication possession ratio. Multivariate logistic regression was used to estimate adjusted odds ratios to determine the relationship between adherence (medication possession ratio ≥80%), and patient characteristics and PSP services. FINDINGS: A total 4772 patients were included (55% women; 24% aged 50-59 years). Of these, 2866 qualified for the persistence analysis, and 51% received CCCs (n = 1452). Of the 4772 patients, 4630 qualified for the adherence analysis, and 33% received CCCs (n = 1511). Baseline characteristics were similar between the group that received CCCs versus the group that did not. During the follow-up period, patients who received CCCs had a significantly reduced risk for treatment discontinuation (hazard ratio = 0.350; 95% CI, 0.298-0.413; P < 0.0001) and a greater likelihood of being adherent (odds ratio, 2.248; 95% CI, 1.927-2.624; P < 0.0001). IMPLICATIONS: CCCs were associated with greater adherence and improved persistence in these patients receiving adalimumab therapy over a 3-year period for IMID.