IL4 and autoimmune thrombocytopenic purpura: Also, the platelet count was positively correlated with serum levels of IL-12p70 (r=0.354; P=0.044), IFN-γ (r=0.365; P=0.037), IL-4 (r=0.354; P=0.044) and TNF-α (r=0.366; P=0.036) in patients with ITP (data not shown).