MKI67 and psoriasis vulgaris: Our results demonstrated that there were higher levels of HLA-DR and Ki-67 expression on cTfh cells in patients with psoriasis vulgaris (Figure 1(d), 2.01 ± 1.27% versus 1.10 ± 0.76%; P = 0.015; Figure 1(e), 1.90 ± 1.34% versus 1.03 ± 0.58%; P = 0.038, resp).