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Article Open Access

Anti‑tumor effects of metformin on head and neck carcinoma cell lines: A systematic review

  • Authors:
    • Daniela Fortunato Rêgo
    • Silvia Taveira Elias
    • Angélica Amorim Amato
    • Graziela De Luca Canto
    • Eliete Neves Silva Guerra
  • View Affiliations / Copyright

    Affiliations: Laboratory of Oral Histopathology, School of Health Sciences, University of Brasília, Brasília 70843‑080, Brazil, Laboratory of Molecular Pharmacology, Department of Pharmaceutical Sciences, School of Health Sciences, University of Brasília, Brasília 70919‑970, Brazil, Department of Dentistry, Federal University of Santa Catarina, Florianópolis 88036-800, Brazil
    Copyright: © Rêgo et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 554-566
    |
    Published online on: December 20, 2016
       https://doi.org/10.3892/ol.2016.5526
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Abstract

Metformin is commonly used for treating type 2 diabetes, and may also reduce cancer risk. Previous studies have demonstrated the association between metformin use and a decreased risk of head and neck cancer. Therefore, the aim of the present systematic review was to summarize the available literature on the in vitro anti‑tumor effects of metformin on head and neck squamous cell carcinoma (HNSCC). Research studies were obtained from Cochrane Library, Embase, LILACS, MEDLINE and PubMed databases, without time or language restrictions. Only in vitro studies analyzing the effects of metformin on HNSCC cell lines were included. The authors methodically appraised all the selected studies according to the Grading of Recommendations Assessment, Development and Evaluation method to make a judgment of the evidence quality. Of the 388 identified reports, 11 studies met the inclusion criteria and were used for qualitative analysis. These studies demonstrated that metformin is important in inhibiting cell proliferation, inducing G0/G1 cell cycle arrest and apoptosis, and in regulating proteins involved in carcinogenesis pathways, which corroborates its potential in vitro anti‑tumor effects. The present systematic review highlights the biological mechanisms of metformin used alone or together with traditional therapies for cancer. Though very limited, currently available preclinical evidence shows that metformin exerts a potential effect on head and neck carcinoma.
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Spandidos Publications style
Rêgo DF, Elias ST, Amato AA, De Luca Canto G and Guerra EN: Anti‑tumor effects of metformin on head and neck carcinoma cell lines: A systematic review. Oncol Lett 13: 554-566, 2017.
APA
Rêgo, D.F., Elias, S.T., Amato, A.A., De Luca Canto, G., & Guerra, E.N. (2017). Anti‑tumor effects of metformin on head and neck carcinoma cell lines: A systematic review. Oncology Letters, 13, 554-566. https://doi.org/10.3892/ol.2016.5526
MLA
Rêgo, D. F., Elias, S. T., Amato, A. A., De Luca Canto, G., Guerra, E. N."Anti‑tumor effects of metformin on head and neck carcinoma cell lines: A systematic review". Oncology Letters 13.2 (2017): 554-566.
Chicago
Rêgo, D. F., Elias, S. T., Amato, A. A., De Luca Canto, G., Guerra, E. N."Anti‑tumor effects of metformin on head and neck carcinoma cell lines: A systematic review". Oncology Letters 13, no. 2 (2017): 554-566. https://doi.org/10.3892/ol.2016.5526
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Spandidos Publications style
Rêgo DF, Elias ST, Amato AA, De Luca Canto G and Guerra EN: Anti‑tumor effects of metformin on head and neck carcinoma cell lines: A systematic review. Oncol Lett 13: 554-566, 2017.
APA
Rêgo, D.F., Elias, S.T., Amato, A.A., De Luca Canto, G., & Guerra, E.N. (2017). Anti‑tumor effects of metformin on head and neck carcinoma cell lines: A systematic review. Oncology Letters, 13, 554-566. https://doi.org/10.3892/ol.2016.5526
MLA
Rêgo, D. F., Elias, S. T., Amato, A. A., De Luca Canto, G., Guerra, E. N."Anti‑tumor effects of metformin on head and neck carcinoma cell lines: A systematic review". Oncology Letters 13.2 (2017): 554-566.
Chicago
Rêgo, D. F., Elias, S. T., Amato, A. A., De Luca Canto, G., Guerra, E. N."Anti‑tumor effects of metformin on head and neck carcinoma cell lines: A systematic review". Oncology Letters 13, no. 2 (2017): 554-566. https://doi.org/10.3892/ol.2016.5526
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