Interestingly, a significant negative correlation was observed between the frequency of OX40+CD4+ T cells and peripheral platelet counts in ITP patients with positive antiplatelet autoantibodies (Figure 2(c)), but this correlation was not observed in ITP patients with negative antiplatelet autoantibodies (Figure 2(d)). Here, TNFRSF4 is linked to autoimmune thrombocytopenic purpura.