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The aim of this study was to determine the expression of miR-21, miR-31, miR-96 and miR-135b in 52 paired colorectal cancer (CRC) tissues and to analyze the correlation between microRNAs (miRNAs) and clinicopathological features. We developed a quantification method that relies on a standard plot, constructed from known concentrations of standards, in order to measure the number of miRNAs. In addition to this, we analyzed the expression levels of miR-21, miR-31, miR-96 and miR-135b in 52 cases of primary CRC and corresponding normal mucosal tissue using real-time PCR with SYBR-Green I. An independent sample t-test was used to compare the differential expression between tumor tissues and normal mucosal tissues. The Mann-Whitney U and Kruskall-Wallis tests were used to compare the correlation between miRNA expression levels and clinicopathological features. The expression of miR-21, miR-31, miR-96 and miR-135b was upregulated in the CRC tissues compared to normal mucosal tissues (P&lt;0.05). Furthermore, miR-21 and miR-135b were positively correlated with the clinical stage (P=0.048 and P=0.029, respectively), while miR-96 and miR-135b were correlated with liver metastasis (P=0.006 and P=0.013, respectively). Our results suggest that miR-21, miR-31, miR-96 and miR-135b may function in the process of CRC development and progression. miR-135b levels in particular may correlate with the degree of malignancy.

Expression of miR-21, miR-31, miR-96 and miR-135b is correlated with the clinical parameters of colorectal cancer