IL13 and autoimmune thrombocytopenic purpura: Although total Tregs [(1.2 ± 0.9)% vs. (1.1 ± 0.3)%, p = 0.697] were comparable between primary ITP patients and health control, primary ITP patients demonstrated markedly elevated co-expression of IL-17 [(12.9 ± 9.4)% vs. (3.5 ± 1.4)%, p = 0.005] and decreased co-expression of both IFN-γ [(8.2 ± 5.0)% vs. (23.2 ± 5.5)%, p < 0.001] and IL-13 [(7.4 ± 4.6)% vs. (11.8 ± 4.7)%, p = 0.007] (Table 2).