In addition, ALOX15, CST1, and POSTN, which encode 15-lipoxygenase 1, cystatin SN, and periostin, respectively, are related to eosinophilic inflammation, because they contribute to eosinophil accumulation in NP tissues.45, 46, 47, 48, 49CCL26, also known as eosinophil chemotactic protein or eotaxin-3, recruits eosinophils into inflammatory tissues, thereby contributing to eosinophilia.50, 51, 52 These genes are affected by type 2 cytokines. This evidence concerns the gene POSTN and Increased total eosinophil count.