In this regard, the profile of cytokine expression in COPD is different from that in asthma, probably related to the type of cellular infiltrate observed in the two diseases.3 Thus, in asthma, an infiltration of eosinophils and Th2‐cells involving IL‐4, 5 and 13 production is usually found. The gene discussed is IL4; the disease is chronic obstructive pulmonary disease.