TNF-α levels were 6.07 (ranged: 5.12–7.58), 8.59 (ranged: 6.1–9.43), and 8.05 (ranged: 5.8–11.10) pg/mL in the control, stable COPD, and AECOPD groups, respectively. The gene discussed is TNF; the disease is chronic obstructive pulmonary disease.