
At the 2025 Skin of Color Update conference, Brett King, MD, PhD, FAAD, delivered a thought-provoking presentation focused on knowledge gaps in JAK inhibitor use among patients with skin of color. Moving away from a case-based approach, Dr. King emphasized the need for inclusive clinical data and nuanced understanding of the efficacy of JAK inhibitors across different patient populations.
The Expanding Landscape of JAK Inhibitors
Over the past decade, eight JAK inhibitors have received FDA approval across a wide range of indications from dermatologic diseases to hematologic malignancies. With over 50 cytokines signaling through the JAK-STAT pathway, it’s no surprise that these agents have revolutionized inflammatory skin disease management. Key cytokines driving dermatologic conditions include IL-4, IL-13, and IL-31 (atopic dermatitis and itch), IL-12 and IL-23 (psoriasis), and IFN-γ (alopecia areata, vitiligo, sarcoidosis, lichen planus, and granuloma annulare).
Atopic Dermatitis: Evidence Across Diverse Populations
Dr. King highlighted several post-hoc analyses of pivotal JAK inhibitor trials analyzing efficacy across racial and ethnic groups.
- Abrocitinib trials included nearly 9% Black and 22% Asian participants and showed comparable improvements in IGA and itch scores across racial groups and Fitzpatrick skin types.
- Upadacitinib studies demonstrated a dose-dependent difference: at 15 mg daily, Black patients achieved EASI90 at slightly lower rates than White patients, a gap that disappeared at the higher 30 mg daily dose. Black patients also experienced a numerically lower itch reduction compared with Asian and White patients at 15 mg, with this difference also seen at the 30 mg daily dose.
- Ruxolitinib cream analyses showed somewhat lower IGA success rates in Black patients (26.6%) versus Asian (51.3%) and White (45%) participants, though the differences were modest.
Overall, these findings affirm that JAK inhibitors are effective across populations but underscore the need for larger datasets to confirm consistency and optimize dosing strategies in skin of color. Dr. King also raised the question of whether some of the differences seen may be due to challenges with grading disease severity in Black patients with atopic dermatitis.
Vitiligo: Reassuring Efficacy in Patients with Skin of Color
- In pooled phase 3 data of ruxolitinib cream for vitiligo, the proportion of Black and Asian participants was similar to that in atopic dermatitis studies. Interestingly, efficacy appeared numerically higher in Black patients, possibly due to easier visualization of repigmentation in darker skin.
- Multiple oral JAK inhibitors are currently in development for vitiligo, which could expand treatment options further.
Alopecia Areata: Diagnostic Nuances in Black Patients
With three JAK inhibitors (ritlecitinib, baricitinib, and deuruxolitinib) now approved for alopecia areata (AA), Dr. King emphasized the complexity of diagnosing AA in patients of African descent. In an addendum to the BRAVE-AA1 trial, external expert reviewers assessed scalp photographs from 36 self-identified Black participants who were screened for enrollment in the study. Strikingly, 33% were determined to have central centrifugal cicatricial alopecia (CCCA) or traction alopecia rather than alopecia areata. This provocative dataset highlights the need for accurate diagnosis and culturally competent assessment in both research and clinical practice.
Hidradenitis Suppurativa and Sarcoidosis: Emerging Data
For hidradenitis suppurativa (HS), the phase 2 trial of povorcitinib included nearly 25% Black participants. This is an encouraging step toward representation but is also likely a function of the high incidence of HS in these patients. While there are no subgroup analyses at this time, phase 3 trials of povorcitinib and deucravacitinib are underway.
In sarcoidosis, inhibition of type 1 immunity with tofacitinib has shown marked improvement in both cutaneous and systemic disease. Notably, 6 of 10 patients in this study were Black, making this an exciting finding for a condition that disproportionately affects patients with skin of color. Results from an open-label abrocitinib trial are expected soon.
Safety of JAK inhibitors
- Common adverse events include upper respiratory infections, headache, nasopharyngitis, nausea, and acne.
- Boxed warnings for JAK inhibitors include serious infection, mortality, malignancies, major cardiovascular events, and thrombosis. Dr. King highlighted the need for dermatologists to understand these boxed warnings in order to be comfortable using these medications. Many of these warnings come from older patients with rheumatoid arthritis treated with tofacitinib, and data from baricitinib and upadacitinib have shown the safety profile is better in patients with skin diseases versus other diseases.
- JAK inhibitors should be used with caution in older or obese patients, current or past smokers, patients with a history of diabetes or past history of thrombotic events (stroke, deep venous thrombosis, pulmonary embolism).
- These medications require baseline and period lab monitoring.
Summary
While JAK inhibitors are transforming dermatologic care, clinical trials should prioritize inclusive data collection and accurate disease recognition in patients with skin of color. Understanding diagnostic nuances, optimizing dosing, and interpreting clinical endpoints across diverse populations will be essential to ensure equitable and evidence-based use of these diverse and highly effective medications.
This information was presented at the 2025 Skin of Color Update conference by Brett King, MD, PhD, FAAD. The above highlights from this lecture were written and compiled by Riyad N.H. Seervai, MD, PhD. Visit Next Steps in Derm to watch a video interview with Dr. King about this topic.








