MUC1 and interstitial lung disease: Oguz et al., in 113 patients with CTD and 45 healthy control subjects, reported that median KL-6 values were higher in the CTD-ILD group than the CTD-without-ILD group (33.75 vs. 3.9 U/mL; P < 0.001) or healthy control group (33.75 vs. 3.9 U/mL; P < 0.008), respectively [38].