In addition, the peripheral CRP (MDD, 683.1 ± 465.8 ng/mL, vs. HC, p = 0.0269, Figure 1C) and IL-17 (MDD, 18.58 ± 16.75 pg/mL, vs. HC, p = 0.0042, Figure 1D) levels of the MDD group significantly increased compared with those of the HC group. This evidence concerns the gene IL17A and major depressive disorder.