BRAFV600E mutation analysis by immunohistochemistry in patients with thoracic metastases from colorectal cancer.

Abstract:

:The BRAF(V600E) mutation confers worse prognosis to metastatic colorectal cancer (mCRC) patients. In addition, this mutation has a negative predictive value for response to treatment with monoclonal antibodies against EGFR in patients with KRAS wild-type (wt) mCRC. The utility of immunohistochemistry (IHC) as an alternative approach for detection of BRAF(V600E) in the thoracic metastases of sporadic mCRC patients has not been evaluated until now. The purpose of this study was to compare BRAF(V600E) IHC staining with molecular biology methods and to define the diagnostic value of the VE1 antibody for the detection of BRAF(V600E) in this population. BRAF mutations were analysed by two DNA sequencing methods (pyrosequencing and Sanger sequencing) in a Caucasian population of 310 sporadic mCRC with thoracic metastases patients expressing KRAS wt. Detection of the BRAF(V600E) mutation was performed in the corresponding tumours by IHC using the VE1 antibody and compared to results of the DNA-based assays. Thirty-nine out of 310 (13%) of tumours harboured a BRAF mutation, which corresponded to either a BRAF(V600E) in 34 of 310 (11%) cases or a non-BRAF(V600E) mutation in 5 of 310 (2%) cases. IHC with VE1 was strongly positive in 32 of 34 (88%) BRAF(V600E) mutated tumours and negative in non-BRAF(V600E) mutated tumours. IHC using the VE1 clone is a specific and sensitive method for the detection of BRAF(V600E) and may be either a complementary or an alternative method to molecular testing in mCRC patients.

journal_name

Pathology

journal_title

Pathology

authors

Ilie MI,Long-Mira E,Hofman V,Mouroux J,Vignaud JM,Gauchotte G,Begueret H,Merlio JP,Emile JF,Hébuterne X,Hofman P

doi

10.1097/PAT.0000000000000113

subject

Has Abstract

pub_date

2014-06-01 00:00:00

pages

311-5

issue

4

eissn

0031-3025

issn

1465-3931

journal_volume

46

pub_type

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