Association of Elevated Serum GM-CSF, IFN-γ, IL-4, and TNF-α Concentration with Tobacco Smoke Induced Chronic Obstructive Pulmonary Disease in a South Indian Population

Figure 2

Serum concentrations of interferon gamma (IFN-) and corresponding correlation with lung function parameters among long-term smokers with or without chronic obstructive pulmonary disease (COPD). (a, b) IFN-γ concentrations were increased in TS COPD group compared to TS CONTROL group (p=0.017); inverse correlation of IFN-γ concentrations to (c) FEV₁/FVC was detected in the study cohort. p<0.05 was considered as statistically significant. Data is presented as median (25th-75th percentile); TS COPD: n=30 and TS CONTROL: n=20; p<0.05 was considered as statistically significant. COPD: chronic obstructive pulmonary disease; FEV₁/FVC: forced expiratory volume 1 second postbronchodilator challenge/forced vital capacity; : forced expiratory volume 1 second prebronchodilator challenge; : FEV₁ postbronchodilator challenge; TS COPD: tobacco smokers with COPD; TS CONTROL: tobacco smokers without COPD.

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