IL17A and psoriasis vulgaris: Additionally, the levels of IL-17 and IFN-γ secreted by cTfh cells were also significantly increased in patients with psoriasis vulgaris compared with healthy individuals (Figure 3(b), 3.60 ± 1.54% versus 2.56 ± 0.70%; P = 0.025; 12.42 ± 6.45% versus 7.97 ± 3.24%; P = 0.033, resp).