Patients with COPD and carriers of the AA genotype had higher levels of IL-5 in comparison with the AG or GG genotype (57.0 pg/mL vs. 34.9 pg/mL, p < 0.001), and the SWOC group carrier of the AA genotype showed high levels of IL-5 compared with AG or GG (44.1 pg/mL vs. 30.2 pg/mL) (Figure 2I). This evidence concerns the gene IL5 and chronic obstructive pulmonary disease.