Associations among PAR-2, interleukin-4 receptor (IL-4R), transforming growth factor (TGF)-β and thymic stromal lymphoprotein (TSLP) have already been investigated in bronchial asthma, chronic obstructive pulmonary disease (COPD) (10) and idiopathic lung fibrosis (11). This evidence concerns the gene TSLP and chronic obstructive pulmonary disease.