The percentages of circulating IL-22+CD4+ and IL-17+CD4+ T cells (p<0.0001, p<0.0001) and the levels of serum IL-22, IL-17A and IFN-γ (p<0.0001, p<0.0001, p = 0.0210) in the HT patients were significantly higher than that in the HC. This evidence concerns the gene IL17A and hematocrit.