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Objective: Hypoxia plays a fundamental role in tumor progression.Hypoxia inducible factor 1 is a key regulator of the cellular response to hypoxia.Expression of the HIF-1 α subunit was reported to be associated with a poor prognosis in a variety of malignant tumors.The objective of this study was to explore the association between HIF-1α expression and lymph node metastasis in oral squamous cell carcinoma (OSCC).