Nevertheless, Fei et al., based on the increased amount of just two mesenchymal cell markers (vimentin and α-SMA) in patients with both chronic obstructive pulmonary disease and VD3-deficiencies, correlated recorded changes with EMT; in contrast to our data, they also observed lowered expression of E-cadherin (Fei et al., 2019). This evidence concerns the gene ACTA1 and chronic obstructive pulmonary disease.