ArticleCureus2026
Baseline Monocyte Count Predicts Complete Response to Omalizumab in Chronic Spontaneous Urticaria: A Retrospective Analysis.
Article in Cureus, 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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2 authors.
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Abstract
introductionChronic spontaneous urticaria (CSU) is a distressing skin condition characterized by wheals and angioedema. While omalizumab is an effective biologic therapy for antihistamine-refractory CSU, a subset of patients shows partial or no response. Identifying reliable biomarkers to predict treatment outcomes remains a significant clinical need. This study aimed to investigate the relationship between systemic inflammatory parameters, specifically monocyte counts, and the clinical response to omalizumab.
methodsThis retrospective study included 52 patients with CSU treated with omalizumab (300 mg/four weeks) for at least 12 weeks at a tertiary referral center. Patients were stratified into two groups based on their response at week 12: "Complete Response" (Urticaria Activity Score over seven days (UAS7) = 0) and "Non-Complete Response." Baseline and post-treatment complete blood count (CBC) parameters, C-reactive protein (CRP), and total IgE levels were analyzed. Binary logistic regression was performed to identify independent predictors of response.
resultsEleven patients (21.15%) achieved a complete response. The complete responder group exhibited significantly higher baseline median monocyte counts (0.68 vs. 0.40 K/µL, p = 0.001) and basophil counts (p = 0.032), but significantly lower baseline CRP levels (p = 0.003) compared to non-responders. Binary logistic regression analysis identified baseline monocyte count as the sole independent predictor of complete response (p = 0.036). Additionally, omalizumab treatment resulted in a significant reduction in neutrophil and monocyte counts, specifically in the responder group.
conclusionHigher baseline monocyte counts, alongside preserved basophils and low CRP levels, may define a distinct "responder clinical profile" (aligning with type I autoallergic CSU) that benefits maximally from omalizumab. Our findings suggest that higher baseline monocyte counts may serve as a potential independent predictor for complete treatment response.
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