Age, asthma duration, IL-6, FeNO, and serum superoxide dismutase (SOD) levels were higher in the GCs group, compared to the ICs group (P= 0.0173, P= 0.0009, P= 0.045, P= 0.0237, and P= 0.0054, respectively; Table 3). This evidence concerns the gene SOD1 and asthma.