KL-6 levels were higher in IPF than in fHP patients (105.6 ng/mL, IQR (53.62-194.4 ng/mL) vs. 65.87 ng/mL, IQR (40.48-90.88 ng/mL), p=0.0409). This evidence concerns the gene MUC1 and idiopathic pulmonary fibrosis.