TGFB1 and acute respiratory distress syndrome: Clinical research has highlighted the importance of early fibroproliferation in the lungs of patients who experience ARDS; 47% of patients had computed tomography evidence of pulmonary fibrosis as early as the first day of ARDS, whereas TGF‐β1 and collagen were detected in BAL fluid as early as 24 hrs after the diagnosis of ARDS 3, 4, 5.