As shown in Figs. 5a and 5b, Tc17 and CD8∶CD4 ratios were positively related (r = 0.6256, P = 0.001), while Tc17 and CD8+ cells were also positively related in ITP patients (r = 0.5562, P = 0.006). Here, CD8A is linked to autoimmune thrombocytopenic purpura.