CDH1 and chronic obstructive pulmonary disease: E‐cadherin, a well‐studied member of the classical cadherin family, is localized to the cell‐cell adhesion junctions (AJs) of epithelial cells and plays a critical role in maintaining cell polarity and the normal epithelial structure.28, 29, 30 Loss of E‐cadherin expression has been observed in lung diseases such as asthma and chronic obstructive pulmonary disease.29