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MicroRNA-9 is associated with epithelial-mesenchymal transition, breast cancer stem cell phenotype, and tumor progression in breast cancer

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Abstract

MicroRNAs (miRNAs) are involved in the progression of breast cancer. Some miRNAs, especially the miR-200 family, miR-9, and miR-155 have been reported to be associated with epithelial-mesenchymal transition (EMT) and breast cancer stem cell (BCSC) phenotypes. This study was designed to evaluate the expression levels of these miRNAs in human breast cancer samples and analyzed their relationship with clinicopathologic features of the tumor including breast cancer subtype, EMT, BCSC phenotype, and prognosis. Expression levels of the miR-200 family, miR-9, and miR-155 were quantified using qRT-PCR. Breast cancer subtype, BCSC phenotype (CD44+/CD24− and ALDH1+), and expression of EMT markers (vimentin expression and E-cadherin loss) were evaluated by immunohistochemistry. miR-9 was more highly expressed in HER2+ and triple-negative subtypes than in luminal subtypes. Its expression level was significantly higher in tumors with high T stage, high histologic grade, p53 overexpression, and high proliferation index. Expression of miR-9 was also higher in tumors showing the CD44+/CD24− phenotype, vimentin expression, and E-cadherin loss. Furthermore, high level of miR-9 expression was found to be an independent prognostic factor for poor disease-free survival of the patients. Expression of miR-200a and miR-141 was highest in luminal A subtype, and miR-155 expression was highest in triple-negative subtype. Although the expression levels of some miR-200 family members and miR-155 showed difference with regard to EMT or BCSC phenotype, they were not associated with patients’ prognosis. In conclusion, overexpression of miR-9 is found in tumors with aggressive phenotypes and is associated with poor prognosis in breast cancer, suggesting that it may serve as a potential biomarker for breast cancer progression and a target for treatment.

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Acknowledgments

This study was supported by a Grant from Seoul National University Bundang Hospital and SK telecom, Republic of Korea (06-2013-095) to Park SY.

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All authors declare no conflict of interests.

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Correspondence to So Yeon Park.

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Jae Moon Gwak and Hyun Jeong Kim equally contributed to this work.

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Gwak, J.M., Kim, H.J., Kim, E.J. et al. MicroRNA-9 is associated with epithelial-mesenchymal transition, breast cancer stem cell phenotype, and tumor progression in breast cancer. Breast Cancer Res Treat 147, 39–49 (2014). https://doi.org/10.1007/s10549-014-3069-5

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  • DOI: https://doi.org/10.1007/s10549-014-3069-5

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