characterized by involvement of diverse types of inflammatory cells. Asian CRS patients
frequently show infiltration of neutrophils and an elevated level of interferon (IFN)-γ; by
contrast, western patients exhibit eosinophil infiltration and enhanced levels of Th2-related
cytokines. Neutrophilia in tissues decreases sensitivity to corticosteroids, but the
mechanisms underlying the progression of neutrophilic CRS are unclear. In this study, we …