Abstract: Objectives: Eosinophilic granulomatosis with polyangiitis (EGPA) is a type of ANCA-associated vasculitis mostly mediated by eosinophils. Mepolizumab (MPZ) reduces the absolute number of eosinophils in the peripheral blood and tissues and has proven efficacy in the maintenance of EGPA, as shown in a randomized controlled trial. The aim of this study is to describe the use of MPZ in EGPA in real clinical practice. Methods: This is a descriptive, retrospective and comparative analysis of the clinical features, course, response rates, outcomes and adverse effects of patients receiving MPZ for EGPA in thirteen Spanish Rheumatology departments. Results: A total of 30 EGPA patients treated with MPZ were included in the analysis. Up to 19 patients needed at least one concomitant immunosuppressant. The mean follow-up was 16 months. The use of MPZ reduced the median Birmingham Vasculitis Activity Score (BVAS), as well as the mean C-reactive protein and the levels of eosinophils. In addition, the median dose of glucocorticoids (GC) required was reduced in 79.3% of the patients and was completely suspended in 57.1%. Interestingly, the median Vasculitis Damage Index (VDI) was also calculated in 27 patients (90%), and remained stable (3 [0-12] pre-MPZ and 3 [0-12] post-MPZ). None of the patients suffered severe adverse effect, local reactions or serious infections during the treatment. Conclusions Our data on the real practice use of MPZ in EGPA suggests that this drug has good efficacy, is safe and reduces the dependence on glucocorticoids or even their complete withdrawal. Furthermore, it appears to prevent the organic damage progression associated with this disease.

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