TGFB1 and idiopathic pulmonary fibrosis: In addition, we found no significant difference in the serum levels of TGF-β1 between IPF patients and controls [median 13.7 pg/ml (range 0.00 - 253.84 pg/ml) and median 10.2 pg/ml (range 2.67 – 37.15 pg/ml), respectively; p = 0.127].