The clinical response to omalizumab in chronic spontaneous urticaria patients is linked to and predicted by IgE levels and their change

Allergy
Ragip ErtasM Maurer

Abstract

Omalizumab is an effective and well-tolerated treatment for chronic spontaneous urticaria (CSU). Markers and predictors of response are largely unknown, but needed to optimize omalizumab treatment. Omalizumab targets IgE, and IgE levels may be linked to the effects of treatment. We evaluated whether response rates to treatment with omalizumab in patients with CSU are linked to their baseline IgE levels, their IgE levels after omalizumab treatment, and the ratio of on treatment IgE and baseline IgE levels. Chronic spontaneous urticaria (CSU) patients (n = 113) were treated with omalizumab 300 mg/4 weeks for 12 weeks, when their treatment responses, that is, no, partial, or complete response, were assessed by use of the urticaria activity score, physician and patient visual analog scale, and treatment effectiveness score. Total IgE levels were measured before treatment (bIgE) with omalizumab and 4 weeks thereafter (w4IgE). Nonresponders to omalizumab had significantly lower bIgE levels (17.9, 17.0-55.0 IU/mL) than partial responders (82.0, 46.2-126.5 IU/mL, P = .008) and complete responders (73.7, 19.45-153.8 IU/mL, P = .032). Nonresponders also had lower w4IgE levels and lower ratios of w4IgE/bIgE levels than partial and complet...Continue Reading

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