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01-08-2011 | Epidemiology

Relative contributions of BRCA1 and BRCA2 mutations to “triple-negative” breast cancer in Ashkenazi Women

Authors: E. Comen, M. Davids, T. Kirchhoff, C. Hudis, K. Offit, M. Robson

Published in: Breast Cancer Research and Treatment | Issue 1/2011

Abstract

Approximately 10% of Ashkenazi Jewish (AJ) women with breast cancer (BC) carry a founder mutation in BRCA1 or BRCA2. There is an association between BRCA1 mutations and “triple-negative” breast cancer (TNBC) [estrogen receptor (ER) and progesterone receptor (PR) negative, HER2 negative]. We sought to determine the predictive value of the TNBC phenotype for the presence of a BRCA mutation in AJ women ascertained without respect to family history. DNA samples were collected between 8/2000 and 6/2004 from a prevalent cohort of unselected AJ women with breast cancer (median age at diagnosis 56 years). Samples (n = 451) were genotyped for AJ founder mutations. 352 (78.0%) cancers were ER positive, 254 (56.3%) PR positive, and 91 (20.2%) ER negative/PR negative. 63 (14.0%) cancers were HER2 positive (immunohistochemistry 3+ or FISH >2.2). TNBC was observed in 64 patients (14.2%). Founder mutations were detected in 48 samples (10.6%) including 25/64 TNBC (39.1%; 19 BRCA1, 6 BRCA2). Among TNBC patients with family history (FH) information, 6/15 (40%) mutations were found in women without breast or ovarian cancer in a close relative. The positive predictive value of TNBC for a BRCA1 mutation was 30% overall, 50% in women diagnosed<50 years, and 14% in women diagnosed ≥50. TNBC was significantly associated with detecting a mutation in either BRCA1 or BRCA2, but only 25/52 (48%) mutation-associated cancers were TNBC. The prevalence of BRCA founder mutations exceeds 50% in subsets of AJ women with TNBC. FH is an imperfect predictor of mutation status in this group. A significant number of mutation-associated TNBC are due to BRCA2.

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Title: Relative contributions of BRCA1 and BRCA2 mutations to “triple-negative” breast cancer in Ashkenazi Women
Authors: E. Comen
M. Davids
T. Kirchhoff
C. Hudis
K. Offit
M. Robson
Publication date: 01-08-2011
Publisher: Springer US
Published in: Breast Cancer Research and Treatment / Issue 1/2011
Print ISSN: 0167-6806
Electronic ISSN: 1573-7217
DOI: https://doi.org/10.1007/s10549-011-1433-2

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