Placebo Response Hurts MoonLake In Psoriatic Arthritis

Sonelokimab follows a mid-stage slam-dunk in hidradenitis suppurativa with a rather more equivocal result in a different immune condition in the ARGO study.    

 Businessman holding bow and arrow confused by multiple bulls eye target vector - Vector

Investors wondering why MoonLake Immunotherapeutics AG’s press release covering the Phase II findings on sonelokimab in psoriatic arthritis omitted the figures for the placebo group got their answer on a call today. The placebo response of 20% on the trial’s primary endpoint sorely hurt the IL-17 inhibitor’s apparent efficacy.

Key Takeaways
  • Phase II trial succeeded, but placebo response was high
  • Sonelokimab looks unremarkable compared with approved drugs with a similar mechanism
  • Lack of a clear dose response on secondary endpoints means data are hard

That said, the Phase II ARGO trial still succeeded, with statistically significantly more patients treated with sonelokimab achieving an American College of Rheumatology (ACR) 50 response compared with those on placebo

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