IL5 and eosinophilic granulomatosis with polyangiitis: Anti-IL-5 therapy is indicated for eosinophilic diseases, such as asthma, eosinophilic granulomatosis with polyangiitis, and eosinophilic chronic rhinosinusitis, and blood eosinophil count is the best-established biomarker for the prediction of its efficacy [29].