Type 2 inflammation is associated with CRSwNP in Caucasian patients, and it is primarily characterised by high levels of eosinophils and increased quantities of IL-4, IL-5, and IL-13 from ILC2, Tc2, and Th2 cells, as well as large amounts of eosinophil cationic protein (ECP). This evidence concerns the gene IL5 and chronic rhinosinusitis with nasal polyps.