Prognostic implications of microRNA-21 overexpression in invasive ductal carcinomas of the breast

Jung Ah Lee, Hye Yoon Lee, Eun Sook Lee, Insun Kim, Jeoung Won Bae

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

Purpose: Among more than 500 microRNAs, microRNA-21 (miR-21) is known to act as an oncogene. The aim of this study was to investigate the signifcance of miR-21 expression level in relation with clinicopathological factors and prognosis in breast cancer. Methods: MicroRNA was extracted from cancer and normal breast tissue of 109 breast cancer patients who underwent surgery from 2002 to 2004 using the Taqman ® MicroRNA Assay. The correlation between miR-21 expression and clinicopathologic features was analyzed and the signifcance of miR-21 as a prognostic factor and its relationship with survival was determined. Results: MiR-21 expression was higher in cancer tissues than in normal tissues (p<0.0001). High miR-21 expression was associated with mastectomy, larger tumor size, higher stage, higher grade, estrogen receptor (ER) negative, human epidermal growth factor receptor 2 (HER2) positive, HER2 positive breast cancer subtype, high Ki-67 expression, and death. On multivariate analysis, prognostic factors for overall survival were ER and miR-21. High miR-21 expression was signifcantly related to lower overall survival (p=0.031). Conclusion: This study supports the role of miR-21 as an oncogene and a biomarker for breast cancer with its high expression in cancer tissues and its relationship with other prognostic factors and survival.

Original languageEnglish
Pages (from-to)269-275
Number of pages7
JournalJournal of Breast Cancer
Volume14
Issue number4
DOIs
Publication statusPublished - 2011 Dec 1

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Carcinoma, Ductal, Breast
MicroRNAs
Breast Neoplasms
Survival
Oncogenes
Estrogen Receptors
Neoplasms
Mastectomy
Multivariate Analysis
Biomarkers

Keywords

  • Breast neoplasms
  • Human MicroRNA-21
  • Oncogene
  • Prognosis
  • Survival

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

Cite this

Prognostic implications of microRNA-21 overexpression in invasive ductal carcinomas of the breast. / Lee, Jung Ah; Lee, Hye Yoon; Lee, Eun Sook; Kim, Insun; Bae, Jeoung Won.

In: Journal of Breast Cancer, Vol. 14, No. 4, 01.12.2011, p. 269-275.

Research output: Contribution to journalArticle

Lee, Jung Ah ; Lee, Hye Yoon ; Lee, Eun Sook ; Kim, Insun ; Bae, Jeoung Won. / Prognostic implications of microRNA-21 overexpression in invasive ductal carcinomas of the breast. In: Journal of Breast Cancer. 2011 ; Vol. 14, No. 4. pp. 269-275.
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