Evaluation of a New Panel of Six Mononucleotide Repeat Markers for the Detection of DNA Mismatch Repair-deficient Tumours

Overview

Journal Br J Cancer

Specialty Oncology

Date 2013 May 9

PMID 23652311

Citations 20

Authors

A Pagin

F Zerimech

J Leclerc

A Wacrenier

S Lejeune

C Descarpentries

F Escande

N Porchet

M-P Buisine

Affiliations

Soon will be listed here.

Abstract

Background: Microsatellite instability (MSI) is a molecular phenotype due to defective DNA mismatch repair (MMR) system. It is used to predict outcome of colorectal tumours and to screen tumours for Lynch syndrome (LS). A pentaplex panel composed of five mononucleotide markers has been largely recommended for determination of the MSI status. However, its sensitivity may be taken in default in occasional situations. The aim of the study was to optimise this panel for the detection of MSI.

Methods: We developed an assay allowing co-amplification of six mononucleotide repeat markers (BAT25, BAT26, BAT40, NR21, NR22, NR27) and one polymorphic dinucleotide marker (D3S1260) in a single reaction. Performances of the new panel were evaluated on a cohort of patients suspected of LS.

Results: We demonstrate that our assay is technically as easy to use as the pentaplex assay. The hexaplex panel shows similar performances for the identification of colorectal and non-MSH6-deficient tumours. On the other hand, the hexaplex panel has higher sensitivity for the identification of MSH6-deficient tumours (94.7% vs 84.2%) and MMR-deficient tumours other than colorectal cancer (92.9% vs 85.7%).

Conclusion: The hexaplex panel could thus be an attractive alternative to the pentaplex panel for the identification of patients with LS.

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