Dual pathogenesis and treatment approaches for eosinophilic granulomatosis with polyangiitis: a comprehensive review

Eosinophilic granulomatosis with polyangiitis (EGPA) is a rare disorder characterized by eosinophil-rich inflammation and systemic necrotizing vasculitis affecting small to medium-sized vessels. The pathogenesis of EGPA is complex, involving both eosinophilic and vasculitic mechanisms, which contribute to a wide array of clinical manifestations. Treatment strategies primarily focus on immunosuppression, including glucocorticosteroids and biologic agents targeting eosinophils, to manage the diverse manifestations and improve patient outcomes. The authors reviewed the MEDLINE and PubMed databases to provide an updated overview of the pathogenetic mechanisms and current therapeutic strategies for the management of EGPA. We emphasize the diverse pathogenetic mechanisms underlying EGPA, focusing on both eosinophilic and vasculitic phenotypes. Additionally, we highlight contemporary therapeutic strategies, particularly the use of biologic agents targeting eosinophils, which represent a significant advancement in the management of the disease.