The GTAT3/FOXP3 expression ratio in PBMCs isolated from patients with moderate asthma (11.09 ± 2.50) was significantly higher than that of the patients with severe asthma (3.90 ± 1.22) and the healthy controls (3.48 ± 0.78), (P<0.04 and P <0.01, respectively). Here, FOXP3 is linked to asthma.