Clinical significance of miR-140-5p and miR-193b expression in patients with breast cancer and relationship to IGFBP5.

Abstract:

:The functional role of IGFBP5 in breast cancer is complicated. Experimental and bioinformatics studies have shown that IGFBP5 is targeted by miR-140-5p and miR-193b, although this has not yet been proven in clinical samples. The aim of this study was to evaluate the expression of miR-140-5p and miR-193b in breast cancer and adjacent normal tissue and assess its correlation with IGFBP5 and the clinicopathological characteristics of the tumors. IGFBP5 protein expression was analyzed immunohistochemically and IGFBP5, miR-140 and miR-193b mRNA expression levels were analyzed with real-time RT-PCR. Tumor tissue had higher miR-140-5p expression than adjacent normal tissue (p = 0.015). Samples with no immunohistochemical staining for IGFBP5 showed increased miR-140-5p expression (p = 0.009). miR-140-5p expression was elevated in invasive ductal carcinomas (p = 0.002), whereas basal-like tumors had decreased expression of miR-140-5p compared to other tumors (p = 0.008). Lymph node-positive samples showed an approximately 13-fold increase in miR-140-5p expression compared to lymph node-negative tissue (p = 0.049). These findings suggest that miR-140-5p, but not miR-193b, could be an important determinant of IGFBP5 expression and clinical phenotype in breast cancer patients. Further studies are needed to clarify the expressional regulation of IGFBP5 by miR-140-5p.

journal_name

Genet Mol Biol

authors

Güllü G,Peker I,Haholu A,Eren F,Küçükodaci Z,Güleç B,Baloglu H,Erzik C,Özer A,Akkiprik M

doi

10.1590/S1415-475738120140167

subject

Has Abstract

pub_date

2015-03-01 00:00:00

pages

21-9

issue

1

eissn

1415-4757

issn

1678-4685

journal_volume

38

pub_type

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