MMP9 and esophageal squamous cell carcinoma: In this study, we analyzed the expressing pattern of MMPs in ESCC specimens based on TCGA datasets and identified 12 dysregulated MMPs in ESCC, including MMP1, MMP12, MMP20, MMP17, MMP14, MMP11, MMP10, MMP13, MMP9, MMP8, MMP7, and MMP3.