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  • Title: Biological and prognostic significance of NDRG2 downregulation in oral squamous cell carcinoma.
    Author: Ahn CH, Kim JH, Shim HW, Shin WJ, Cho YA, Yoon HJ.
    Journal: Oral Dis; 2024 Oct; 30(7):4287-4302. PubMed ID: 38887830.
    Abstract:
    OBJECTIVE: Downregulation of N-myc downstream-regulated gene 2 (NDRG2), a tumor suppressor gene, has been associated with poor clinical outcomes in various cancers. However, the prognostic significance of NDRG2 in oral squamous cell carcinoma (OSCC) remains unknown. This study aimed to evaluate the prognostic value of NDRG2 downregulation in OSCC and to elucidate the mechanism by which NDRG2 is downregulated and the biological role of NDRG2 in tumor progression. METHODS: Immunohistochemical and in silico analyses of NDRG2 expression were performed, and the correlation between NDRG2 expression and clinicopathological data was analyzed. The effect of NDRG2 knockdown on the biological behavior of OSCC cells was investigated and the effect of 5-aza-2'-deoxycytidine (5-aza-dC) on NDRG2 expression was determined. RESULTS: NDRG2 expression was significantly downregulated and DNA hypermethylation of NDRG2 was frequently found in head and neck SCC, including OSCC. Low NDRG2 expression was significantly correlated with adverse clinicopathological features and worse survival in OSCC. NDRG2 knockdown could enhance the oncogenic properties of OSCC cells. NDRG2 mRNA levels in OSCC cells could be restored by 5-aza-dC. CONCLUSION: Downregulation of NDRG2 promotes tumor progression and predicts poor prognosis in OSCC. Therefore, restoration of NDRG2 expression may be a potential therapeutic strategy in OSCC.
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