In a study on patients with interstitial pneumonia with autoimmune features (IPAFs), carriership of the MUC5B (rs35705950) minor allele was associated with worse TPF survival, but not to changes in FVC percentage predicted per year [28], while in IPF the MUC5B minor allele was associated with better survival [8,29]. Here, MUC5B is linked to idiopathic pulmonary fibrosis.