To compare the expression of MMP1 in other studies, we retrieved two publicly available sets of microarray data (GSE2340024 (link) and GSE2034725 (link)) from the Gene Expression Omnibus (GEO) database. GSE23400 and GSE 20347 consist of gene expression data from 53 and 17 Chinese ESCC patients, respectively. The MMP1 levels in tumors and corresponding normal specimens were compared and T/N ratios were calculated.
Immunohistochemistry (IHC) study was performed on the formalin-fixed paraffin-embedded ESCC tissues according to the manufacturer’s instruction using anti-MMP1 antibody (Merck; MAB-3307; 1:300 dilution) and anti-mouse/rabbit secondary antibody conjugated with HRP (ChemMate DAKO EnVision Detection Kit, Code: K5007, DAKO).
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