The protein expression of nuclear factor‐kappa B (NF‐κB) inhibitor (IκBa) was increased in the ATRA group than asthma group, whereas the expression of NF‐κB and intercellular adhesion molecule 1 (ICAM‐1) was reduced in the ATRA group relative to the asthma group [69]. This evidence concerns the gene NFKB1 and asthma.