As such, IL22 correlated with several genes that did not appear to have a relationship with IL17A. In addition, a set of genes identified to be involved in psoriasis pathophysiology (CARD14, CXCL5, CXCR2, DDX58, IFIH, PTPN22, and TNFRSF9) correlated with IL17A and IL23A, but did not correlate with IL22. This evidence concerns the gene IL23A and psoriasis.