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Aims: To investigate the effect of Gecko Peptides Mixture (GPM) on apoptosis of human esophageal squamous carcinoma EC109 cell line and the molecular mechanisms.Methods: EC109 cells were cultured in vitro and the inhibitory effect of GPM on their proliferation was measured by MTT assay.The apoptosis of EC109 cells was determined by Hoechst 33258 fluorescence staining.The effects of GPM on Bcl-2 and caspase-3 protein expression of EC109 cells were investigated by using immunohistochemical method.