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Candidate genetic modifiers for breast and ovarian cancer risk inBRCA1andBRCA2 mutation carriers

  • On Behalf Of Gemo Study Collaborators
  • FIRC Institute of Molecular Oncology
  • IRCCS Fondazione Istituto Nazionale per lo studio e la cura dei tumori - Milano
  • German Cancer Research Center
  • University of Cologne
  • Centre de Recherche du Centre Hospitalier de l'Université Laval (CRCHUL)
  • The Institute of Cancer Research
  • University of Cambridge
  • Netherlands Cancer Institute
  • Queensland Institute of Medical Research
  • University of Otago
  • University of Algarve
  • IRCCS Istituto Oncologico Veneto - Padova
  • Pomeranian Medical University in Szczecin
  • Maastricht University
  • The University of Chicago
  • University of California at San Francisco
  • University of Pennsylvania
  • University of Texas MD Anderson Cancer Center
  • Cedars-Sinai Medical Center
  • Columbia University
  • Case Western Reserve University
  • University of Melbourne
  • University of Utah
  • Vilnius University
  • University of Pretoria
  • City of Hope National Med Center
  • University of Copenhagen
  • AvMonforte de Lemos
  • Spanish National Cancer Research Centre (CNIO)
  • Hospital de Cruces

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Background: BRCA1 and BRCA2 mutation carriers are at substantially increased risk for developing breast and ovarian cancer. The incomplete penetrance coupled with the variable age at diagnosis in carriers of the same mutation suggests the existence of genetic and nongenetic modifying factors. In this study, we evaluated the putative role of variants inmany candidate modifier genes. Methods: Genotyping data from 15,252 BRCA1 and 8,211 BRCA2 mutation carriers, for known variants (n = 3,248) located within or around 445 candidate genes, were available through the iCOGS custom-designed array. Breast and ovarian cancer association analysiswas performed within a retrospective cohort approach. Results: The observed P values of association ranged between 0.005 and 1.000. None of the variants was significantly associated with breast or ovarian cancer risk in either BRCA1 or BRCA2 mutation carriers, after multiple testing adjustments. Conclusion: There is little evidence that any of the evaluated candidate variants act as modifiers of breast and/or ovarian cancer risk in BRCA1 or BRCA2 mutation carriers. Impact: Genome-wide association studies have been more successful at identifying genetic modifiers of BRCA1/2 penetrance than candidate gene studies.

Original languageEnglish
Pages (from-to)308-316
Number of pages9
JournalCancer Epidemiology Biomarkers and Prevention
Volume24
Issue number1
DOIs
StatePublished - Jan 1 2015

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