FCGR2A and chronic obstructive pulmonary disease: The proteins from the FcγR-mediated phagocytosis and regulation of actin cytoskeleton pathways correlated with FEV1/FVC (R2 = 0.54, p = 0.04; R2 = 0.83, p = 0.002, Fig. 5b; respectively), while the proteins from the regulation of actin cytoskeleton and oxidative phosphorylation pathways correlated with FEV1 in female COPD patients (R2 = 0.51, p = 0.05; R2 = 0.52, p = 0.04; respectively).