IL17A and chronic rhinosinusitis with nasal polyps: Increased gene expression of IL-17 in patients with N-ERD, although significantly absent in the level of gene expression of RoRgt, may be contributing to the remodeling of nasal polyps, with accumulation of albumin and edema formation. Increased IL-17A has been shown to impact neutrophil survival in patients with CRSwNP (32).