The role of targeted BRCA1/BRCA2 mutation analysis in hereditary breast/ovarian cancer families of Portuguese ancestry.

Abstract:

:We report the analysis of altogether 1050 suspected hereditary breast/ovarian cancer (HBOC) families, 524 fully screened for BRCA1/BRCA2 mutations and 526 tested only for the most common mutations. Of the 119 families with pathogenic mutations, 40 (33.6%) had the BRCA2 c.156_157insAlu rearrangement and 15 (12.6%) the BRCA1 c.3331_3334del mutation, the former being specific of Portuguese ancestry and the latter showing a founder effect in Portugal. Interestingly, the two most common mutations were found in a significant proportion of the HBOC families with an a priori BRCAPRO mutation probability <10%. We recommend that all suspected HBOC families from Portugal or with Portuguese ancestry, even those fulfilling moderately stringent clinical-criteria for genetic testing, should be specifically analyzed for the two most common BRCA1/BRCA2 founder mutations, and we here present a simple method for this first tier test. Screening of the entire coding regions of BRCA1 and BRCA2 should subsequently be offered to those families with a mutation probability ≥10% if none of those founder mutations are found.

journal_name

Clin Genet

journal_title

Clinical genetics

authors

Peixoto A,Santos C,Pinto P,Pinheiro M,Rocha P,Pinto C,Bizarro S,Veiga I,Principe AS,Maia S,Castro F,Couto R,Gouveia A,Teixeira MR

doi

10.1111/cge.12441

subject

Has Abstract

pub_date

2015-07-01 00:00:00

pages

41-8

issue

1

eissn

0009-9163

issn

1399-0004

journal_volume

88

pub_type

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