MUC5B and idiopathic pulmonary fibrosis: Considering ethnic factors may have an impact on the results, we conducted a subgroup analysis: In the Caucasian population, the MUC5B gene polymorphism was in T vs. G, TT vs. GG, GT vs. GG, GT + TT vs. GG and TT vs. GG + GT genetic models were related to the risk of IPF, and the results of TSA and publication bias analysis confirmed the stability of the results.