Chronic inflammation in the lower parts of the respiratory tract and the lungs of patients with stable COPD has been associated with the increased expression of several cytokines, such as TNF-α, INF-γ, IL-1β, IL-6, IL-17, IL-18, IL-32, thymic stromal lymphopoietin (TSLP), and growth factors, such as transforming growth factor-beta (TGF-β) [34]. The gene discussed is TSLP; the disease is chronic obstructive pulmonary disease.