For example, rs 35705950, a common polymorphism in the promoter of Mucin 5B (MUC5B), is associated with familial interstitial pneumonia and idiopathic pulmonary fibrosis, which suggests a crucial role of dysregulated MUC5B expression in the pathogenesis of pulmonary fibrosis [6]. This evidence concerns the gene MUC5B and idiopathic pulmonary fibrosis.