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Aim: The anti-diabetic drug metformin exerts chemopreventive and antineoplastic effects in many types of malignancies.We previously described the in vitro and in vivo effects of metformin on esophageal squamous cell carcinoma(ESCC).The studies of mechanisms indicated that STAT3 inactivation and Bcl-2 repression contribute to metformin-induced growth inhibition of ESCC by facilitating crosstalk between apoptosis and autophagy.