MMP9 and idiopathic pulmonary fibrosis: The analysis showed that there are 11 core genes participating in the pathological changes of IPF, in which ANXA3 and STX11 are downregulated genes while THBS2, MMP1, MMP9, MMP7, MMP10, SPP1, COL1A1, ITGB8, and IGF1 are upregulated genes.