IL4 and asthma: The serum levels of TGF-β and IL-4 were significantly higher in patients with asthma than the healthy controls (321.70 ± 35.12 vs. 226.69 ± 17.81 pg/mL, P <0.03 and 1.66 ± 0.05 vs 1.42 ± 0.04 pg/mL, P <0.002; respectively) (Figures 1 and 2).