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Evaluation of BRCA1 mutations in an unselected patient population with triple-negative breast cancer

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Abstract

Triple-negative breast cancer (TNBC) is characterized by aggressive behavior and poor prognosis. While >50 % of patients with inherited BRCA1 mutations have TNBC, the prevalence of BRCA1 mutations in patients with TNBC remains unclear. Deciphering the relationship between BRCA1 and TNBC is critical to understanding the etiology of TNBC, leading to improved patient counseling and treatment. All female patients with TNBC enrolled in the Clinical Breast Care Project were identified. Genomic DNA was isolated from blood and the exonic regions of the BRCA1 gene were amplified and sequenced. Sequence data was analyzed and mutations identified using Sequencher 4.10.1. Of the 190 women with TNBC, genomic DNA was available for 182. Seventy percent of patients were considered high-risk for having a BRCA1 mutation based on the National Comprehensive Cancer Network criteria. Clinically relevant mutations were detected in 16 (9 %) patients ranging in age from 26 to 69 years at diagnosis. Six of these patients were diagnosed >50 years. The C61G mutation was found in three Caucasian women diagnosed >40 years, while six African-American women had mutations, including the 943ins10 West African founder mutation. Upon conclusion, causative BRCA1 mutations were detected in 9 % of TNBC patients, including patients without significant family histories and/or diagnosed at a later age. The mutation frequency in patients <60 years was 11.2–18.3 % in those patients with significant risk factors and 4.6 % in those without, while in patients >60 years, the mutation frequency was 3.5–7.7 % in patients with risk factors, 2.3 % in those without. Thus, evaluation of additional risk factors in both patients younger and older than 60 years should improve the identification of TNBC patients benefiting from genetic testing of BRCA1.

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Abbreviations

BRCA1:

Breast cancer 1 gene

CBCP:

Clinical Breast Care Project

ER:

Estrogen receptor

HER2:

V-ERB-B2 erythroblastic leukemia viral oncogene homolog 2

PARP:

Poly(ADP-ribose) polymerase

PCR:

Polymerase chain reaction

PR:

Progesterone receptor

TNBC:

Triple-negative breast cancer

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Acknowledgments

We thank Allyson Valente for her critical review of this manuscript. This research was supported by a grant from the United States Department of Defense (Military Molecular Medicine Initiative MDA W81XWH-05-2-0075, Protocol 01-20006). The opinion and assertions contained herein are the private views of the authors and are not to be construed as official or as representing the views of the Department of the Army or the Department of Defense.

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The authors declare that they have no conflict of interest.

Ethical standards

The experiments performed here comply with the current laws of the United States.

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Correspondence to Rachel E. Ellsworth.

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Rummel, S., Varner, E., Shriver, C.D. et al. Evaluation of BRCA1 mutations in an unselected patient population with triple-negative breast cancer. Breast Cancer Res Treat 137, 119–125 (2013). https://doi.org/10.1007/s10549-012-2348-2

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  • DOI: https://doi.org/10.1007/s10549-012-2348-2

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