There are few reports in oral squamous cell carcinoma (OSCC) that indicate the expression of macrophage migration inhibitory factor (MIF) in tissues, serum, or saliva of patients with OSCC. The aim of this study was to evaluate the mRNA expression and protein of MIF in tissues and serum, respectively, in OSCC patients and its association with the TNM stage. A cross-sectional study was performed. Serum and tissues of 25 patients with OSCC and 25 healthy control subjects (HCS) were included to evaluate the MIF mRNA expression and protein serum levels by real-time PCR and ELISA, respectively. Serum MIF levels were significantly higher in OSCC compared with control subjects. Furthermore, in the OSCC group, MIF was significantly increased in accordance with tumor disease stage (TNM III-IV), as well as in poorly differentiated tumors. The mRNA showed significantly higher levels in HCS, as well as in more differentiated tumors. The results of this study suggest that MIF could be an indicator of severity and progression of OSCC. Further studies are required to explore the role of MIF as a serological biomarker for OSCC.
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