Recently, López-Matías et al. [33] studied a promoter polymorphism in MUC5B (rs35705950) in ASSD, a widely described gene associated with idiopathic pulmonary fibrosis (IPF) [34] and RA-ILD [35], two of the most critical ILDs. The gene discussed is MUC5B; the disease is idiopathic pulmonary fibrosis.