Incidence and outcome of BRCA mutations in unselected patients with triple receptor-negative breast cancer

Ana M. Gonzalez-Angulo, Kirsten M. Timms, Shuying Liu, Huiqin Chen, Jennifer K. Litton, Jennifer Potter, Jerry S. Lanchbury, Katherine Stemke-Hale, Bryan T. Hennessy, Banu K. Arun, Gabriel N. Hortobagyi, Kim Anh Do, Gordon B. Mills, Funda Meric-Bernstam

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    Abstract

    Purpose: To investigate the incidence of germline and somatic BRCA1/2 mutations in unselected patients with triple-negative breast cancer (TNBC) and determine the prognostic significance of carrying a mutation. Methods: DNA was obtained from 77 TNBC and normal tissues. BRCA1/2 exons/flanking regions were sequenced from tumor and patients classified as mutant or wild type (WT). Sequencing was repeated from normal tissue to identify germline and somatic mutations. Patient characteristics were compared with chisquare. Survival was estimated by Kaplan-Meier method and compared with log-rank. Cox proportional hazards models were fit to determine the independent association of mutation status with outcome. Results: Median age was 51 years (27-83 years). Fifteen patients (19.5%) had BRCA mutations: 12 (15.6%) in BRCA1 (one somatic), and 3 (3.9%) in BRCA2. Patients with BRCA mutations tended to be younger than WT, (P = 0.005). Grade, histology, and stage were not associated with mutation status. At a median follow-up of 43 months (7-214 months), there were 33 (42.9%) recurrences and 35 (45.5%) deaths. Five-year recurrence-free survival estimates were 51.7% for WT versus 86.2% for patients with mutations, (P = 0.031); and 5-year overall survival estimates were 52.8% for WT versus 73.3% for patients with mutations (P = 0.225). After adjustment, patients with BRCA mutations had a significantly better RFS (HR: 0.19, 95% CI: 0.045-0.79, P = 0.016) compared with WT. Conclusions: In this unselected cohort of TNBC, we found a 19.5% incidence of BRCA mutations. Genetic testing should be discussed with patients with TNBC. Patients with TNBC with BRCA mutations had a significantly lower risk of relapse.

    Original languageEnglish (US)
    Pages (from-to)1082-1089
    Number of pages8
    JournalClinical Cancer Research
    Volume17
    Issue number5
    DOIs
    StatePublished - Mar 1 2011

    ASJC Scopus subject areas

    • Oncology
    • Cancer Research

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    Gonzalez-Angulo, A. M., Timms, K. M., Liu, S., Chen, H., Litton, J. K., Potter, J., Lanchbury, J. S., Stemke-Hale, K., Hennessy, B. T., Arun, B. K., Hortobagyi, G. N., Do, K. A., Mills, G. B., & Meric-Bernstam, F. (2011). Incidence and outcome of BRCA mutations in unselected patients with triple receptor-negative breast cancer. Clinical Cancer Research, 17(5), 1082-1089. https://doi.org/10.1158/1078-0432.CCR-10-2560