ArticleArthritis care & research2026
Sex Differences in Medication Discontinuation in Axial Spondyloarthritis.
Article in Arthritis care & research, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
objectiveWe examined sex differences in medication discontinuation among patients with axial spondyloarthritis (axSpA) initiating tumor necrosis factor inhibitors (TNFi), interleukin-17 inhibitors (IL-17i), or JAK inhibitors (JAKi).
methodsUsing data from the Rheumatology Informatics System for Effectiveness (RISE) Registry (2003-2025), we assessed medication discontinuation by sex among new users of TNFi, IL-17i, and JAKi. Cox regression models were used to evaluate associations between sex and treatment discontinuation, adjusting for sociodemographic and clinical factors. We also examined medication continuation by sex and age group (18-64 vs ≥65 years) using Kaplan-Meier curves and tested for interactions between sex and age, race, and area deprivation index (ADI).
resultsAmong 7,200 individuals, the mean ± SD age was 52.7 ± 14.7 years; 58.3% were female and 68.7% were non-Hispanic White. Among TNFi users (N = 6,256), women had a 24% higher risk of discontinuation compared to men (hazard ratio [HR]: 1.24; 95% confidence interval [CI]: 1.16-1.32). Among IL-17i users (n = 693), women had a 25% higher risk of discontinuation (HR: 1.25; 95% CI: 1.01-1.54). No significant sex differences were observed among JAKi users (N = 251). Among TNFi users, women under 65 years had the lowest probability of treatment continuation. There was no statistically significant interaction between sex and age, race or ADI.
conclusionsIn a large US registry, women with axSpA were more likely to discontinue TNFi and IL-17i than men. Larger studies with longer follow-up since treatment approval are needed to confirm the lack of sex differences in JAKi discontinuation as this group could be underpowered.
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