Vyne Therapeutics announced that the first subject has been dosed in a phase 2b trial evaluating VYN201 in subjects with either active or stable nonsegmental vitiligo. VYN201 is a novel pan-bromodomain and extra-terminal domain (BET) inhibitor designed for local administration. Topline data from the 24-week vehicle-controlled treatment period are expected in mid-2025.

The randomized, double-blind, vehicle-controlled trial will evaluate the safety and efficacy of once-daily VYN201 topical gel in three dose cohorts (1%, 2% and 3% concentrations) compared to vehicle for 24 weeks. A total of about 160 subjects will be randomized at a 1:1:1:1 ratio. Following the 24-week treatment period, subjects in the active treatment arms will continue for an additional 28 weeks, and subjects in the vehicle group will be equally re-randomized to receive VYN201 1%, 2% or 3% gel for an additional 28 weeks. The primary efficacy endpoint of the trial is the proportion of patients achieving an improvement in Facial Vitiligo Area Scoring Index of at least 50% from baseline (F-VASI50) at week 24 compared to vehicle, with additional secondary endpoints of F-VASI and Total VASI (T-VASI) at weeks 24 and 52.

“Dosing the first subject in the phase 2b trial for vitiligo is an important milestone for the VYN201 program and our company,” David Domzalski, President and CEO of Vyne, said in a company news release. “In our prior phase 1b trial, VYN201 demonstrated a significant clinical response with a rapid onset of action and a favorable safety and tolerability profile, including low systemic exposure. We believe that VYN201 has the potential to become a valuable and differentiated therapy for patients with vitiligo. We look forward to reporting top-line data from the 24-week treatment period in mid-2025.”