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Erschienen in: Cellular Oncology 3/2014

01.06.2014 | Original Paper

Differential expression of miR-139, miR-486 and miR-21 in breast cancer patients sub-classified according to lymph node status

verfasst von: Lene Rask, Eva Balslev, Rolf Søkilde, Estrid Høgdall, Henrik Flyger, Jens Eriksen, Thomas Litman

Erschienen in: Cellular Oncology | Ausgabe 3/2014

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Abstract

Purpose

Therapeutic decisions in breast cancer are increasingly guided by prognostic and predictive biomarkers. Non-protein-coding microRNAs (miRNAs) have recently been found to be deregulated in breast cancers and, in addition, to be correlated with several clinico-pathological features. One of the most consistently up-regulated miRNAs is miR-21. Here, we specifically searched for differentially expressed miRNAs in high-risk breast cancer patients as compared to low-risk breast cancer patients. In the same patients, we also compared miR-21 expression with the expression of its presumed target PTEN.

Methods

Both microarray and RT-qPCR techniques were used to assess miRNA expression levels in lymph node-positive and -negative human invasive ductal carcinoma tissues. Simultaneously, PTEN protein expression levels were assessed using immunohistochemistry.

Results

miR-486-5p and miR-139-5p were found to be down-regulated in patients with lymph node metastases, whereas miR-21 was found to be up-regulated in patients with a positive lymph node status. miR-21 expression levels were found to significantly correlate with tumour size (r = 0.403, p = 0.009; Spearman’s rank), whereas no relation was found between miR-21 and PTEN expression levels (Kruskal-Wallis test).

Conclusion

Down-regulation of miR-486-5p and miR-139-5p, in conjunction with up-regulation of miR-21, may represent a useful signature for the identification of high-risk breast cancer patients.
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Metadaten
Titel
Differential expression of miR-139, miR-486 and miR-21 in breast cancer patients sub-classified according to lymph node status
verfasst von
Lene Rask
Eva Balslev
Rolf Søkilde
Estrid Høgdall
Henrik Flyger
Jens Eriksen
Thomas Litman
Publikationsdatum
01.06.2014
Verlag
Springer Netherlands
Erschienen in
Cellular Oncology / Ausgabe 3/2014
Print ISSN: 2211-3428
Elektronische ISSN: 2211-3436
DOI
https://doi.org/10.1007/s13402-014-0176-6

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