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Comparative Study
. 2013 Mar;9(1):53-9.
doi: 10.1111/j.1743-7563.2012.01548.x. Epub 2012 Jul 23.

Differential expression of miR-21, miR-125b and miR-191 in breast cancer tissue

Fermín Mar-Aguilar  1 , Claudia M Luna-Aguirre, J Claudio Moreno-Rocha, Juan Araiza-Chávez, Victor Trevino, Cristina Rodríguez-Padilla, Diana Reséndez-Pérez
Affiliations
Comparative Study

Differential expression of miR-21, miR-125b and miR-191 in breast cancer tissue

Fermín Mar-Aguilar et al. Asia Pac J Clin Oncol. 2013 Mar.

Abstract

Aims: To develop new biomarkers for early detection and to inform effective clinical management of breast cancer.

Methods: Real-time polymerase chain reaction was used to profile microRNA (miRNA) in tumor tissue from 50 breast cancer patients using non-tumor breast tissue from each patient as a control. We have focussed on three miRNA; miR-21, miR-125b and miR-191, all of which have been implicated in breast cancer with either proven or predicted target genes involved in critical cancer-associated cellular pathways.

Results: Upregulation of miR-21 and miR-191 and downregulation of miR-125b, was found in breast cancer tissue. Combined expression analysis of miR-125b/miR-191 increased sensitivity to 100% and specificity to 94% while miR-21/miR-191 increased to 92% and 100%, respectively. Therefore, combination of two miRNA gives a better prediction than individual miRNA.

Conclusions: We could differentiate between breast cancer and adjacent non-tumor breast tissue as a control with a high degree of sensitivity and specificity in the Mexican population using a combined expression analysis of only two miRNA. These observations, although a proof of principle finding at this time, show that a combined expression profile of two miRNA (miR-125b/miR-191 and miR-21/miR-191) can discriminate between breast cancer and non-tumor tissue with high specificity and sensitivity.

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