In addition, it has been suggested that increased expression of chemokines CXCL9, CXCL10, and CXCL11, which are mainly secreted by monocytes and other cells, has become one of the characteristics of psoriasis and may be candidate markers for psoriasis therapies; however, there is still insufficient evidence to support this idea, and further validation is needed (6, 120). This evidence concerns the gene CXCL9 and psoriasis.