The BRCA1 c. 5096G>A p.Arg1699Gln (R1699Q) intermediate risk variant: breast and ovarian cancer risk estimation and recommendations for clinical management from the ENIGMA consortium

Setareh Moghadasi, Huong D Meeks, Maaike Pg Vreeswijk, Linda Am Janssen, Åke Borg, Hans Ehrencrona, Ylva Paulsson-Karlsson, Barbara Wappenschmidt, Christoph Engel, Andrea Gehrig, Norbert Arnold, Thomas Van Overeem Hansen, Mads Thomassen, Uffe Birk Jensen, Torben A Kruse, Bent Ejlertsen, Anne-Marie Gerdes, Inge Søkilde Pedersen, Sandrine M Caputo, Fergus CouchEmily J Hallberg, Ans Mw van den Ouweland, Margriet J Collée, Erik Teugels, Muriel A Adank, Rob B van der Luijt, Arjen R Mensenkamp, Jan C Oosterwijk, Marinus J Blok, Nicolas Janin, Kathleen Bm Claes, Kathy Tucker, Valeria Viassolo, Amanda Ewart Toland, Diana E Eccles, Peter Devilee, Christie J Van Asperen, Amanda B Spurdle, David E Goldgar, Encarna Gómez García

27 Citations (Scopus)

Abstract

BACKGROUND: We previously showed that the BRCA1 variant c.5096G>A p.Arg1699Gln (R1699Q) was associated with an intermediate risk of breast cancer (BC) and ovarian cancer (OC). This study aimed to assess these cancer risks for R1699Q carriers in a larger cohort, including follow-up of previously studied families, to further define cancer risks and to propose adjusted clinical management of female BRCA1*R1699Q carriers.

METHODS: Data were collected from 129 BRCA1*R1699Q families ascertained internationally by ENIGMA (Evidence-based Network for the Interpretation of Germline Mutant Alleles) consortium members. A modified segregation analysis was used to calculate BC and OC risks. Relative risks were calculated under both monogenic model and major gene plus polygenic model assumptions.

RESULTS: In this cohort the cumulative risk of BC and OC by age 70 years was 20% and 6%, respectively. The relative risk for developing cancer was higher when using a model that included the effects of both the R1699Q variant and a residual polygenic component compared with monogenic model (for BC 3.67 vs 2.83, and for OC 6.41 vs 5.83).

CONCLUSION: Our results confirm that BRCA1*R1699Q confers an intermediate risk for BC and OC. Breast surveillance for female carriers based on mammogram annually from age 40 is advised. Bilateral salpingo-oophorectomy should be considered based on family history.

Original languageEnglish
JournalJournal of Medical Genetics
Volume55
Issue number1
Pages (from-to)15-20
ISSN0022-2593
DOIs
Publication statusPublished - Jan 2018

Keywords

  • BRCA1 Protein/genetics
  • Breast Neoplasms/genetics
  • Chromosome Segregation
  • Female
  • Genetic Predisposition to Disease
  • Humans
  • Mutation/genetics
  • Ovarian Neoplasms/genetics
  • Risk Factors

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