Advancing Therapy in Suboptimally Controlled Basal Insulin-Treated Type 2 Diabetes: Clinical Outcomes With iGlarLixi Versus Premix BIAsp 30 in the SoliMix Randomized Controlled Trial

OBJECTIVE To directly compare the efficacy and safety of a fixed-ratio combination, of insulin glargine 100 units/mL and the glucagon-like peptide 1 receptor agonist lixisenatide (iGlarLixi), with those of a premix insulin analog, biphasic aspart insulin 30 (30% insulin aspart and 70% insulin aspart protamine) (BIAsp 30) as treatment advancement in type 2 diabetes suboptimally controlled on basal insulin plus oral antihyperglycemic drugs (OADs). RESEARCH DESIGN AND METHODS In SoliMix, a 26-week, open-label, multicenter study, adults with suboptimally controlled basal insulin-treated type 2 diabetes (HbA(1c) >= 7.5% and <= 10%) were randomized to once-daily iGlarLixi or twice-daily BIAsp 30. Primary efficacy end points were noninferiority in HbA(1c) reduction (margin 0.3%) or superiority in body weight change for iGlarLixi versus BIAsp 30. RESULTS Both primary efficacy end points were met: after 26 weeks, baseline HbA(1c) (8.6%) was reduced by 1.3% with iGlarLixi and 1.1% with BIAsp 30, meeting noninferiority (least squares [LS] mean difference -0.2% [97.5% CI -0.4, -0.1]; P < 0.001). iGlarLixi was also superior to BIAsp 30 for body weight change (LS mean difference -1.9 kg [95% CI -2.3, -1.4]) and percentage of participants achieving HbA(1c) <7% without weight gain and HbA(1c) <7% without weight gain and without hypoglycemia (all P < 0.001). iGlarLixi was also superior versus BIAsp 30 for HbA(1c) reduction (P < 0.001). Incidence and rates of American Diabetes Association level 1 and 2 hypoglycemia were lower with iGlarLixi versus BIAsp 30. CONCLUSIONS Once-daily iGlarLixi provided better glycemic control with weight benefit and less hypoglycemia than twice-daily premix BIAsp 30. iGlarLixi is a more efficacious, simpler, and well-tolerated alternative to premix BIAsp 30 in suboptimally controlled type 2 diabetes requiring treatment beyond basal insulin plus OAD therapy.