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New-onset of Eosinophilic granulomatosis with polyangiitis without eosinophilia and eosinophilic infiltration under benralizumab treatment; a case report.

Haruka YonezawaShin-Ichiro OhmuraYusuke OhkuboYoshiro OtsukiToshiaki Miyamoto
Published in: Modern rheumatology case reports (2023)
Eosinophilic granulomatosis with polyangiitis (EGPA) is a small to medium-vessel necrotizing vasculitis and eosinophilic inflammation. Mepolizumab, an anti-interleukin-5 (IL-5) monoclonal antibody, has been approved in Japan since 2018 for refractory EGPA treatment. Benralizumab, an anti-IL-5 receptor monoclonal antibody, also has been reported to reduce the glucocorticoid dose in patients with refractory EGPA. On the other hand, several investigators have demonstrated new-onset EGPA under biologics, and it is unclear whether this treatment for severe allergic diseases can prevent the development of EGPA. Herein, we report a case of new-onset EGPA under benralizumab treatment. The patient had fever, weight loss, muscle pain, and paraesthesia, the serum eosinophil count was 0/μL, and the biopsy showed necrotizing vasculitis without eosinophilic infiltration. She was diagnosed as having EGPA and treated with high-dose glucocorticoid and intravenous cyclophosphamide, with a good response. Our case report indicates that anti-IL-5 agents may mask the development of EGPA and clinicians should be aware of the development of EGPA during anti-IL-5 agents.
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