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Biomarkers accurately distinguish mesothelioma from non-cancerous tissue
Date:6/5/2014

ng-term asbestos exposure, is an aggressive cancer originating from the mesothelial cells that line the membrane surrounding each lung, known as the pleura. Distinguishing MPM from noncancerous abnormalities, such as reactive mesothelial hyperplasia or fibrous pleurisy (organizing pleuritis), can be challenging as there are no generally accepted diagnostic biomarkers for differentiating these two conditions. As a result, patients often present with the disease when they are already at an advanced stage, and less than 20% of patients can be successfully treated surgically.

The current study, however, suggests that miRNAs may provide new opportunities for improving the accuracy of the differential diagnosis between MPM and noncancerous pleural conditions. If further validated, the combination of ISH for miRNAs with immunohistocemical testing of miRNA targets may therefore have the potential to aid in the diagnosis, and thus outcome, of MPM.

TECHNICAL DETAILS OF THE STUDY

To identify and assess microRNAs as possible diagnostic biomarkers of MPM, the expression of 742 miRNAs in FFPE preoperative diagnostic biopsies, surgically resected MPM specimens previously treated with chemotherapy, and corresponding non-neoplastic pleura (NNP) from five patients were screened using an RT-qPCR-based platform. Four miRNAs (miR-126, miR-143, miR-145, and miR-652) were significantly down-regulated (≥2 fold) in resected MPM and/or chemotherapy-nave diagnostic tumor biopsies.

Validation of the obtained miRNA-expression profile was performed on surgically removed tissue samples from 40 MPM patients and 14 patient-matched NNP samples as well as 12 preoperative diagnostic biopsies and five non-neoplastic reactive-mesothelial proliferation due to pneumothorax. By performing binary logistic regression on the RT-qPCR data for the four miRNAs, the classifier differentiated MPM from NNP with high sensitivity and specificity. The classifier's o
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Contact: Eileen Leahy
jmdmedia@elsevier.com
732-238-3628
Elsevier Health Sciences
Source:Eurekalert

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