TGFB1 and acute respiratory distress syndrome: Our data indicate that there were increased levels of TGF-β1 in the serum of patients with BPD compared with patients with ARDS and normal subjects, supporting the biological function of TGF-β1 in the development of fibrosis, which are similar to a report [28] showing that higher levels of TGF-β1 are produced by burn patient fibrocytes.