TGFB1 and chronic obstructive pulmonary disease: We examined the relative expression of TGF-β1, TGF-β2, TGF-β3, CCN2, LTBP1, and BAMBI mRNA in epithelial cells from the small (GSE11784) and large airways (GSE37147) of patients with COPD compared with control subjects (e-Table 3) using previously published data sets.