The distribution of SNPs may greatly differ with populations (ethnicities), for example, a high frequency of MUC5B rs35705950*T allele in IPF cases is observed among European-Americans (14–34%) (21, 22), while its low frequency is characteristic for Asians, such as Chinese (3.3%) (23), Japanese (3.4%) (24), and Korean (1.0%) cohorts (11). This evidence concerns the gene MUC5B and idiopathic pulmonary fibrosis.