Objective To explore the effect of silencing STAT3 by siRNA on expression of MMP-2 in Esophageal Carcinoma cell line EC-1 and to observe the effect of STAT3 on the occurrence, development, invasion and metastasis in esophageal carcinoma.Methods Small interfering RNA (siRNA) targeting STAT3 was transfected into EC-1 cells. The transfecting efficiency was tested under fluorescence microscope. mRNA and protein levels of STAT3 MMP-2 were evaluated by semi-quantitative RT-PCR and Western blot, respectively.Resul...