Lilly’s once-weekly insulin efsitora alfa hits Phase III goals

4 July 2025

US pharma major Eli Lilly (NYSE: LLY) today announced detailed results from QWINT-1, QWINT-3, and QWINT-4 Phase III clinical trials evaluating the safety and efficacy of investigational once-weekly insulin efsitora alfa (efsitora) in adults with type 2 diabetes who used insulin for the first time, previously used daily basal insulin, and previously used daily basal insulin and mealtime insulin, respectively.

Lilly noted that in each trial, once-weekly efsitora met the primary endpoint of non-inferior A1C reduction compared to daily basal insulin. The complete results from these studies were presented at the American Diabetes Association (ADA) 85th Scientific Sessions.

In QWINT-1, efsitora reduced A1C by 1.31% compared to 1.27% for insulin glargine at week 52 for the efficacy estimand. In the trial, efsitora was titrated to four fixed doses at four-week intervals, as needed for blood glucose control. In QWINT-3, efsitora reduced A1C by 0.86% compared to 0.75% for insulin degludec at week 26 for the efficacy estimand.

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