Expression of MicroRNAs in Patients With Pancreatic Cancer and Its Prognostic Significance

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Investigation of expression profile of well-established microRNAs in pancreatic adenocarcinoma, and its correlation with clinicopathological factors.


Eighty-eight samples of ductal pancreatic adenocarcinoma and 98 control samples were analyzed by real-time polymerase chain reaction for miR-21, miR-31, miR-122, miR-145, miR-146a, miR-155, miR-210, and miR-222 expressions. The results were normalized and then statistically analyzed using nonparametric statistical tests.


According to our results, miR-21, miR-155, miR-210, miR-221, and miR-222, were overexpressed in diseased tissues than in the control samples, whereas miR-31, miR-122, miR-145, and miR-146a were underexpressed. Additionally, the expressions of miR-21 and miR-155 were associated with tumor stage and poor prognosis.


The tumorigenic role of miR-21 and miR-155 was confirmed, whereas down-regulation of miR-31, miR-145, and miR-146a, in dispute with current literature, renders necessary the revision of use of microRNAs as biological markers.

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