Phase 2 Study of Zasocitinib Capsules for Adults Aged 18 to 75 With Nonsegmental Vitiligo Evaluating Safety, Effectiveness, and Tolerability Over One Year

What this Trial Is About

Vitiligo is a long-term autoimmune condition that causes the skin to lose its color due to the immune system mistakenly attacking pigment-producing skin cells called melanocytes. This leads to patches of skin with less or no pigment, often appearing symmetrically on both sides of the body in the nonsegmental form of vitiligo. The study aims to evaluate the safety, effectiveness, and tolerability of the drug zasocitinib in adults with nonsegmental vitiligo. Participants will receive oral capsules of zasocitinib at low, medium, or high doses for up to 52 weeks. Some participants will initially receive a placebo for 24 weeks, then switch to medium or high doses of zasocitinib for the remainder of the study. The placebo capsules look identical to zasocitinib but do not contain active medicine. The study uses a randomized, double-blind design with several experimental groups receiving different doses or placebo. During the study, participants will visit the clinic 11 times over one year. Researchers will assess the improvement in vitiligo using facial and total Vitiligo Area Scoring Index F-VASI and T-VASI at baseline and week 24. Safety and tolerability will also be monitored throughout. The primary outcome is the percentage of participants achieving at least 75% improvement in F-VASI at week 24. Secondary outcomes include other measures of vitiligo area improvement. Participants health and response to treatment will be closely followed until the studys end.

A Study of Zasocitinib in Adults With Nonsegmental Vitiligo