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Åke Borg

Åke Borg

Principal investigator

Åke Borg

Absence of the common IGF1 19 CA-repeat allele is more common among BRCA1 mutation carriers than among non-carriers from BRCA1 families.

Author

  • Maria Henningson
  • Erika Bågeman
  • Therese Törngren
  • Åke Borg
  • Håkan Olsson
  • Helena Jernström

Summary, in English

BRCA1 mutations predispose to early-onset breast cancer. We previously reported an association between absence of the common IGF1 19 CA-repeat allele (IGF1-19/-19) and being a BRCA1 mutation carrier in young women from breast cancer high-risk families. Others have reported a four-fold risk of premenopausal breast cancer in women with a family history and the IGF1-19/-19 genotype. The aim of this study was to investigate whether the IGF1-19/-19 genotype was associated with being a BRCA1 mutation carrier among women from BRCA1 families. DNA was available from 268 women with known BRCA1 status from the South Swedish Health Care Region. IGF1 genotyping was successfully performed with fragment analysis in 211 women from 96 families. The IGF1-19/-19 genotype was significantly more common among BRCA1 mutation carriers (14.2%) than among non-carriers (4.8%), OR 3.3 (95%CI 1.11-9.78, P = 0.03) adjusted for family clustering. We confirmed our previous finding of an association between the IGF1-19/-19 genotype and BRCA1 mutation status. Since the IGF1-19/-19 genotype in combination with OC use or multiparity confers an increased risk for early onset breast cancer in high-risk women and in women from the general population, future studies are needed to elucidate the importance of the IGF1-19/-19 genotype concerning the variability in breast cancer risk among BRCA1 mutation carriers.

Department/s

  • Breastcancer-genetics
  • Medical oncology

Publishing year

2007

Language

English

Pages

445-452

Publication/Series

Familial Cancer

Volume

6

Issue

4

Document type

Journal article

Publisher

Springer

Topic

  • Cancer and Oncology

Keywords

  • oral contraceptive
  • genotype
  • BRCA1
  • breast cancer
  • parity
  • IGF1

Status

Published

ISBN/ISSN/Other

  • ISSN: 1389-9600