A Randomized Phase II Study of Efmarodocokin Alfa, an interleukin-22 Agonist, Versus Vedolizumab in Patients With Ulcerative Colitis

Abstract

Background & aims: Efmarodocokin alfa is an interleukin (IL)-22 agonist, with favorable pharmacokinetic properties and an acceptable safety profile. This study further explored the therapeutic potential of efmarodocokin alfa compared with vedolizumab in patients with ulcerative colitis (UC).

Methods: This randomized phase II trial evaluated the efficacy, safety, pharmacokinetics, and pharmacodynamics of 3 doses of efmarodocokin alfa administered intravenously every 4 weeks (30 μg/kg [n = 43], 60 μg/kg [n = 44], and 90 μg/kg [n = 43]) compared with placebo (n = 22) and with vedolizumab (n = 43) in the treatment of moderate to severe UC. Key clinical outcomes were assessed through the modified Mayo Clinic Score, and endoscopic evaluations by a central reader.

Results: Efmarodocokin alfa was adequately tolerated with an acceptable safety profile. Although efmarodocokin alfa did not show statistically significant improvement in clinical remission, clinical response, endoscopic healing, or endoscopic remission at week 8 compared with placebo, vedolizumab demonstrated some efficacy. Clinical remission was achieved by 12%, 9%, and 12% of patients in the 30, 60, and 90 μg/kg dose arms, respectively, compared with 9% and 26% of patients in the placebo and vedolizumab arms at week 8. Similarly, endoscopic healing at week 8 was achieved by 14%, 14%, and 12% of patients in the 30, 60, and 90 μg/kg dose arms, respectively, compared with 14% and 33% of patients in the placebo and vedolizumab arms. A dose-dependent increase in pharmacodynamic biomarkers was observed (regenerating islet-derived protein 3-alpha and C-reactive protein levels).

Conclusion: Efmarodocokin alfa did not demonstrate efficacy compared with placebo, and this phase II study was ended early for futility; however, there was evidence of target engagement (skin adverse events, regenerating islet-derived protein 3-alpha levels).

Clinicaltrials: gov, Number: NCT03558152.

Keywords: Efmarodocokin Alfa; IL-22 Agonist; Interleukin (IL)-22; Ulcerative Colitis.