IL4 and autoimmune thrombocytopenic purpura: It was observed that PB IL-4 mRNA level from ITP patients was significantly lower than from HCs (0.000206 ± 0.000038 vs. 0.00033 ± 0.000071, P = 0.017), while no statistical difference was observed in BM IL-4 mRNA level between ITP patient and HCs (0.000345 ± 0.000107 vs. 0.000369 ± 0.000099, P = 0.630).