ACELYRIN, INC. announced long-term data from a Phase 2b clinical trial of izokibep in hidradenitis suppurativa (HS). These data demonstrated no evidence of increased safety liability with longer-term treatment and increased duration of therapy was associated with further clinical improvements over time. Patients who switched from placebo to izokibep at week 16 achieved a similar speed and magnitude of response as those who began treatment with izokibep at baseline for HiSCRs, draining tunnels, skin pain and Dermatology Life Quality Index (DLQI).

High orders of HiSCR were achieved with the majority of patients achieving HiSCR75 and about a third achieving HiSCR100 by week 16 and through 32 weeks. These results are from an open label extension with all subjects through week 32. Additional information can be found at ACELYRIN.com.

Further data from this trial will be presented at future scientific meetings. Izokibep was well-tolerated with a favorable safety profile consistent with previous experience and the IL-17A class. Potential for differentiation was demonstrated with higher clinical responses achieved earlier than reported by other IL-17A agents and the IL-17A&F agents without evidence to date for increased risk of infection, especially fungal or suicidal ideation and behavior, in a patient population predisposed to infection and clinical depression.

Topline data from an ongoing phase 3 trial in HS is expected by the end of 2024. A confirmatory phase 3 trial of approximately 400 patients is planned to address guidance on size of safety database given the FDA no longer considers moderate-to-severe HS an orphan disease.