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Medical Science Monitor Basic Research


eISSN: 1643-3750

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Association of Decreased Expression of Serum miR-9 with Poor Prognosis of Oral Squamous Cell Carcinoma Patients

Legang Sun, Ling Liu, Honghai Fu, Qiuqin Wang, Yao Shi

(Department of Oral Surgery, The Affiliated Hospital of Binzhou Medical College, Binzhou, Shandong, China (mainland))

Med Sci Monit 2016; 22:289-294

DOI: 10.12659/MSM.895683

BACKGROUND: Dysregulation of miR-9 is a common feature of many types of cancers, including oral squamous cell carcinoma (OSCC). However, whether the expression level of serum miR-9 is changed in patients with OSCC remains unknown.
MATERIAL AND METHODS: Quantitative real-time polymerase chain reaction (qRT-PCR) was performed to examine the expression level of serum miR-9 in OSCC patients, oral leukoplakia (OLK) patients, and healthy volunteers, then we evaluated the association between serum miR-9 expression level and clinical outcome of OSCC patients.
RESULTS: The expression level of serum miR-9 was significantly downregulated in patients with OSCC or OLK in comparison with healthy controls (P<0.01). Serum miR-9 expression level was associated with various clinicopathological parameters, including T stage (P=0.013), lymph node metastasis (P=0.002), and TNM stage (P=0.007). In addition, the OSCC patients in the low serum miR-9 expression group had poorer overall survival rate (P=0.022) and disease-free survival rate (P=0.004) compared with those in the high serum miR-9 expression group. Multivariate analysis showed that serum miR-9 was an independent prognostic factor for OSCC.
CONCLUSIONS: Serum miR-9 was downregulated in patients with OSCC and patients with OLK. In addition, low serum miR-9 was correlated with poor prognosis of OSCC, indicating miR-9 might play a tumor suppressive role in OSCC and can serve as a promising biomarker for this deadly disease.

Keywords: Disease-Free Survival, Carcinoma, Squamous Cell - pathology, Gene Expression Regulation, Neoplastic, Leukoplakia - genetics, MicroRNAs - genetics, Mouth Neoplasms - pathology, Multivariate Analysis, Prognosis, Risk Factors

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