IL4 and asthma: Moreover, the concentrations of TNF-α and IL-4 in serum of the TCM group (1.14 ± 0.21, 0.66 ± 0.16) were obviously lower than the asthma group (P < 0.05, P < 0.01) and have no significant difference with DXM group (1.13 ± 0.12, 0.51 ± 0.08).