MUC1 and interstitial lung disease: There were no differences in age, height, weight, BMI, sex, smoking status, serum KL-6 level, serum LDH level, diagnosis of ILD, chest HRCT pattern, %FVC predicted at diagnostic bronchoscopy, treatment during FVC measurements, and prevalence of PF-ILDs between patients with improved %FVC and those with worse %FVC.