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Expression profiling revealed up-regulation of three lncRNAs in breast cancer samples.

Long non-coding RNAs (lncRNAs) have been vastly investigated for their critical roles in the pathogenesis of breast cancer. Yet, the expression pattern and clinical significance of three lncRNAs namely CTBP1AS2, LINC-ROR and SPRY4-IT1 in breast cancer are not completely clarified. In the present investigation, we assessed expression of these lncRNAs in breast cancer tissues and paired non-cancerous specimens from the same patients using quantitative real time PCR. Notably, expression of CTBP1AS2, LINC-ROR and SPRY4-IT1 were upregulated in breast cancer tissues compared with non-cancerous tissues (ER = 17.62, P value<0.000; ER = 4.62, P value = 0.001 and ER = 3.47, P value = 0.005, respectively). Relative expression of LINC-ROR in tumoral tissues compared with non-tumoral tissues was associated with a history of hormone replacement therapy (P = 0.04). Expression levels of CTBP1AS2, LINC-ROR and SPRY4-IT1 were significantly correlated with each other in both tumoral and non-tumoral tissues. The strongest correlations were detected between CTBP1AS2/ LINC-ROR and CTBP1AS2/ SPRY4-IT1 pairs in non-tumoral tissues. CTBP1AS2 and SPRY4-IT1 had the best sensitivity (80%) and specificity (64%) values, respectively. Based on AUC values, the best diagnostic power belonged to CTBP1AS2. The current study potentiates CTBP1AS2, LINC-ROR and SPRY4-IT1 as putative contributors in the pathogenesis of breast cancer and suggests these lncRNAs as candidates for functional analysis in this kind of cancer.

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