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자료유형
학술저널
저자정보
한송희 (건양대학교) 김현정 (분당서울대학교병원) 곽재문 (분당서울대학교병원) 김미미 (서울대학교병원 병리과) 정율리 (분당서울대학교병원) 박소연 (서울대학교)
저널정보
한국유방암학회 Journal of Breast Cancer Journal of Breast Cancer Vol.20 No.1
발행연도
2017.1
수록면
35 - 44 (10page)

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Purpose: The microRNA-221/222 (miR-221/222) gene cluster has been reported to be associated with the promotion of epithelial- mesenchymal transition (EMT), downregulation of estrogen receptor-α, and tamoxifen resistance in breast cancer. We studied the expression of miR-222 in human breast cancer samples to analyze its relationship with clinicopathologic features of the tumor, including estrogen receptor status, expression of EMT markers, and clinical outcomes. Methods: Quantitative real-time polymerase chain reaction was performed to detect the expression of miR-222 in 197 invasive breast cancers. Expression of EMT markers (vimentin, smooth muscle actin, osteonectin, Ncadherin, and E-cadherin) was evaluated using immunohistochemistry. Results: High miR-222 levels were associated with high T stage, high histologic grade, high Ki-67 proliferation index, and HER2 gene amplification. Its expression was significantly higher in the luminal B and human epidermal growth factor receptor 2-positive (HER2+) subtypes than in the luminal A and triple-negative subtypes. In the hormone receptor-positive subgroup, there was a significant negative correlation between miR- 222 and estrogen receptor expression, and miR-222 expression was associated with EMT marker expression. In the group as a whole, high miR-222 expression was not associated with clinical outcome. However, subgroup analyses by hormone receptor status revealed that high miR-222 expression was a poor prognostic factor in the hormone receptor-positive subgroup, but not in the hormone receptor-negative subgroup. Conclusion: This study showed that miR-222 is associated with down-regulation of the estrogen receptor, EMT, and tumor progression in hormone receptor-positive breast cancer, indicating that miR-222 might be associated with endocrine therapy resistance and poor clinical outcome in hormone receptor-positive breast cancer.

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