DURAbility of Basal Versus Lispro Mix 75/25 Insulin Efficacy (DURABLE) Trial 24-Week Results

Abstract

OBJECTIVE To compare the ability of two starter insulin regimens to achieve glycemic control in a large, ethnically diverse population with type 2 diabetes. RESEARCH DESIGN AND METHODS During the initiation phase of the DURABLE trial, patients were randomized to a twice-daily lispro mix 75/25 (LM75/25; 75% lispro protamine suspension, 25% lispro) (n = 1,045) or daily glargine (GL) (n = 1,046) with continuation of prestudy oral antihyperglycemic drugs. RESULTS Baseline A1C was similar (LM75/25: 9.1 ± 1.3%; GL: 9.0 ± 1.2%; P = 0.414). At 24 weeks, LM75/25 patients had lower A1C than GL patients (7.2 ± 1.1 vs. 7.3 ± 1.1%, P = 0.005), greater A1C reduction (–1.8 ± 1.3 vs. –1.7 ± 1.3%, P = 0.005), and higher percentage reaching A1C target <7.0% (47.5 vs. 40.3%, P < 0.001). LM75/25 was associated with higher insulin dose (0.47 ± 0.23 vs. 0.40 ± 0.23 units · kg−1· day−1, P < 0.001) and more weight gain (3.6 ± 4.0 vs. 2.5 ± 4.0 kg, P < 0.0001). LM75/25 patients had a higher overall hypoglycemia rate than GL patients (28.0 ± 41.6 vs. 23.1 ± 40.7 episodes · pt−1· year−1, P = 0.007) but lower nocturnal hypoglycemia rate (8.9 ± 19.3 vs. 11.4 ± 25.3 episodes · pt−1· year−1, P = 0.009). Severe hypoglycemia rates were low in both groups (LM75/25: 0.10 ± 1.6 vs. GL: 0.03 ± 0.3 episodes · pt−1· year−1, P = 0.167). CONCLUSIONS Compared with GL, LM75/25 resulted in slightly lower A1C at 24 weeks and a moderately higher percentage reaching A1C target <7.0%. Patients receiving LM75/25 experienced more weight gain and higher rates of overall hypoglycemia but lower rates of nocturnal hypoglycemia. Durability of regimens will be evaluated in the following 2-year maintenance phase.