Post-stratification, the median values of KL-6 were elevated from 216.0 IU/mL, 345.0 IU/mL, 330.0 U/mL to 949.0 IU/mL in accordance with ILD extent = 0%, ILD extent < 10%, ILD extent ≥10% and < 20% and ILD extent ≥20%, respectively, and the median values of FVC% predicted were decreased from 102.5%, 100.8%, 70.6 to 80.6% in accordance with ILD extent = 0%, ILD extent < 10%, ILD extent ≥10% and < 20% and ILD extent ≥20%, respectively. Here, MUC1 is linked to interstitial lung disease.