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Thec. 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 P G Vreeswijk
  • , Linda A.M. 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 J. Couch
  • Emily J. Hallberg, Ans M W Van Den Ouweland, J. Margriet Collée, Erik Teugels, Muriel A. Adank, Rob B. van der Luijt, Arjen R. Mensenkamp, Jan C. Oosterwijk, Marinus J. Blok, Nicolas Janin, Kathleen B M 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*
*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

BACKGROUND: We previously showed that theBRCA1variant 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 femaleBRCA1*R1699Q carriers.

METHODS: Data were collected from 129BRCA1*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 thatBRCA1*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
Pages (from-to)15-20
Number of pages6
JournalJournal of Medical Genetics
Volume55
Issue number1
DOIs
Publication statusPublished - Jan 2018

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