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Overwhelming evidence has demonstrated that Bcl-2 inhibitor of transcription 1 (Bitl) and apoptosis-inducing factor (AIF) as mitochonodrial proteins are implicated in the development and progression of a variety of tumors.However,their expressions and biological functions in esophageal squamous cell carcinoma (ESCC) remains to be delineated.In the present study,we found that Bitl,AIF and Bcl-2 levels in ESCC tissues were significantly higher than those in normal esophageal epithelial tissues and dysplasia tissues (P<0.05).