MUC5B and idiopathic pulmonary fibrosis: The results showed that rs35705950 T/G polymorphism of MUC5B promoter was associated with IPF risk in T vs.G, TT vs. GG, GT vs. GG, GT + TT vs. GG and TT vs. GG + GT genetic models, meanwhile, sensitivity analysis and publication bias analysis showed that the results were stable and reliable.