Repigmentation in non-segmental vitiligo using the Janus kinase inhibitor upadacitinib, a retrospective case series.

Vitiligo is the most frequently diagnosed depigmentation disease, affecting nearly 0.5-2% of individuals worldwide. This disorder is characterized by melanocyte loss, which results in skin and hair depigmentation. Psychological problems are common in patients, especially in those with the involvement of the face and hands. Several studies have recently focused on the use of JAK inhibitors for vitiligo treatment. However, studies on the selective JAK1 inhibitor upadacitinib for vitiligo treatment are limited. This study aimed to assess the efficacy and safety of upadacitinib in the treatment of vitiligo. This retrospective case series included five patients diagnosed with non-segmental vitiligo who were treated with upadacitinib for 4 months or longer. Disease severity was assessed using the Vitiligo Area Scoring Index (VASI). Five patients took 15 mg of upadacitinib orally for 4 consecutive months, and all achieved repigmentation. The plasma collected from the peripheral blood of the four patients showed that the CXCL9 level dropped after upadacitinib treatment. However, the CXCL10 level did not change significantly using enzyme-linked immunosorbent assay (ELISA). Flow cytometry revealed that the ratio of CD4 + CD3+/CD8 + CD3 + T cells in the blood samples tended to decrease through the treatment. And the Th1-like Tregs (CD4 + Foxp3 + IFN-γ + Tregs) were also downregulated in the peripheral blood. In conclusion, the JAK1 inhibitor upadacitinib was found to be effective and safe for treating non-segmental vitiligo.