Treatment persistence and adherence in people with type 2 diabetes switching to iGlarLixi vs free-dose combinations of basal insulin and glucagon-like peptide 1 receptor agonist

BACKGROUND: Fixed-ratio combinations of basal insulin (BI) and glucagon-like peptide-1 receptor agonists (GLP-1 RAs) have greater simplicity of administration with expected improved adherence/persistence with therapy, but real-world data are lacking. OBJECTIVE: To compare medication persistence, adherence, and health care resource utilization (HRU) and costs for insulin glargine 100 U/mL and the GLP-1 RA tixisenatide (iGlarLixi) with newly initiated free-dose combinations of BI and GLP-1 RAs initiated simultaneously or sequentially. METHODS: This analysis used the US Optum Clinformatics (January 2017 to November 2019) database and included data from adults (aged >= 18 years) with type 2 diabetes and a glycated hemoglobin A1c (A1c) of 8% or more. Participants received iGlarLixi or free-dose combinations of Bland GLP-1 RAs prescribed simultaneously or subsequently. Participants were followed for 12 months. Cohorts were propensity score matched on baseline characteristics. The primary outcome was persistence (days on treatment without discontinuation). Secondary outcomes were adherence (proportion of days covered), change in A1c, and all-cause and diabetes-related health care resource utilization and costs. Subgroup analyses were performed for individuals with A1c levels of 9% or more. RESULTS: After propensity score matching, there were 1,357 patients in each group; groups were well balanced. In the free-dose combination group, 65.6% started on BI, then added GLP-1 RAs; 28.5% started on GLP-1 RAs, then added BI; and 5.9% started on GLP-1 RAs and BI on the same day. In the subgroup with a baseline of A1c levels of 9% or more, 952 (iGlarLixi) and 932 (free-dose combination) participants were included. A significantly higher proportion of participants in the overall population who received iGlarLixi vs free-dose combinations were persistent (44.8% vs 36.3% [hazard ratio = 1.22, 95% CI = 1.11-1.35, P < 0.001]; the median [Q1, Q3] number of persistent days was 150 [63, 360] vs 120 [60, 310]) and adherent to therapy (41.3% vs 18.7%, [odds ratio = 3.06, 95% CI = 2.57-3.65: P < 0.001]). Results for persistence in the subpopulation of participants with HbA1c levels of 9% or more were similar. Reductions in A1c from baseline were similar between iGlarLixi and the free-dose combination group (overall population: -1.2% vs -1.3%; P = 0.1913), but the number of participants in the database with follow-up A1c data was low. All-cause and diabetes-related pharmacy visits and total medication and diabetes medication pharmacy claims costs were significantly lower (all P < 0.001) for those receiving iGlarLixi vs free-dose combinations in both populations. CONCLUSIONS: In adults with type 2 diabetes, iGlarLixi was associated with longer persistence by approximately 30 days, improved adherence, and reductions in outpatient and pharmacy visits and in pharmacy costs.