Moreover, a study that analyzed induced sputum samples from COPD patients (n = 26) and healthy controls (n = 21) reported significantly elevated levels of IL-6, IL-8, IL-13, and monocyte chemoattractant protein (MCP)-1 in the airway of COPD patients compared to healthy controls [69]. The gene discussed is IL13; the disease is chronic obstructive pulmonary disease.