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Prevalence of omalizumab resistant chronic urticaria and real world effectiveness of dupilumab in omalizumab refractory chronic urticaria patients: a single center experience.

Chronic urticaria (CU) is characterized by wheals, angioedema, or both lasting for ≥ 6 weeks with chronic spontaneous urticaria (CSU) being the most common subtype. Omalizumab-resistant CSU cases represent an unmet clinical need. In this study, we aimed to assess the prevalence and predictors of omalizumab failure in a large cohort of CU patients and assess the effectiveness of dupilumab for omalizumab-recalcitrant CU. Of 338 CU patients, 33 received omalizumab. 69.7% (23 patients) were responders and 30.3% (10 patients) non-responders. Bivariate regression demonstrated that female sex (adjusted OR [aOR] = 1.53; 95%CI = 1.14-2.06), higher baseline UAS7 (aOR = 1.05; 95%CI = 1.01-1.09) and older age (controlling for sex) (aOR = 1.00; 95%CI = 1.00, 1.01) were associated with omalizumab failure. Of 10 omalizumab-refractory patients, three were well controlled with cyclosporine (all children), whereas the seven adults failed on average 5.6 ± 2.6 therapies including cyclosporine. All 7 achieved a complete response with dupilumab with time to response varying between 1 to 6 months. While our results suggest a favourable efficacy of dupilumab omalizumab-resistant cases, future confirmatory studies are required.

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