Racial and Ethnic Diversity in Janus Kinase Inhibitor Alopecia Areata Clinical Trials: A Systematic Review.

Background: Alopecia areata (AA) is a chronic autoimmune disease that causes non-scarring alopecia. A few studies have shown increased odds of AA in Black individuals compared to White individuals and increased odds of AA in Latinos compared to non-Latinos. Another study showed that Asians have lower odds of AA compared to Whites. Baricitinib, a Janus kinase inhibitor (JAKi), became the first Federal Drug Administration (FDA)-approved medication for adult patients with severe AA in June 2022.

Objectives: The aim of this review was to analyze published JAKi AA randomized controlled trials to characterize and assess the racial and ethnic representation of participants. Animal studies, studies unrelated to AA, and studies not investigating JAKis were excluded.

Methods: PubMed and clinicaltrials.gov were searched for systematic reviews of clinical trials between 1990 and 2022.

Results: Six clinical trials were included with a total of 1,690 subjects. Four trials were industry-sponsored, while two were university-sponsored. The three largest races represented included White (59.9%), Asian (28.0%), and African American/Black (8.1%). Three out of the 10 patients identified as Hispanic. None of the trials included sub-analyses of clinical efficacy based on race and/or ethnicity.

Conclusions: Our results show that populations with lower odds of AA (Whites and Asians) are overrepresented in JAKi AA clinical trials compared to Black and Hispanic/Latino patients.