期刊
JOURNAL OF PATHOLOGY
卷 227, 期 3, 页码 306-314出版社
WILEY
DOI: 10.1002/path.3983
关键词
breast cancer; micro-RNA; in situ hybridization; miR-205; let-7
资金
- Cancer Research UK [C490/A11019, C490/A11024]
- Cancer Research UK
- The Francis Crick Institute [10119, 10124] Funding Source: researchfish
- National Institute for Health Research [NF-SI-0611-10154] Funding Source: researchfish
Micro-RNAs (miRNAs) are frequently dysregulated in a range of human malignancies, many have been shown to act either as tumour supressors or oncogenes and several have been implicated in breast cancer. However, breast cancer is a diverse disease and little is known about the relationships between miRNA expression, clinical outcome and tumour subtype. We used locked nucleic acid probe in situ hybridization (LNA-ISH) to visualize, in tissue micro-arrays (TMAs) of 2919 formalin-fixed paraffin-embedded (FFPE) archival breast tumours, the expression of two key miRNAs that are frequently lost in a range of solid malignancies, let-7b and miR-205. These miRNAs were also quantified by quantitative reverse transcription PCR in cores of FFPE tissue from 40 of these cases, demonstrating that LNA-ISH is semi-quantitative. The tumours in the TMAs were assigned to subtypes based on their immunohistochemical (IHC) staining with ER, PR, HER2, CK5/6 and EGFR. let-7b expression was shown to be associated with luminal tumours and to have an independent significant positive prognostic value in this group. miR-205 is associated with tumours of ductal morphology and is of significant positive prognostic value within these tumours. We propose that the expression of miR-205 may contribute to ductal tumour morphology. Copyright 2012 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
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