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Tamoxifen and contralateral breast cancer in BRCA1 and BRCA2 carriers: an update

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Author

  • J Gronwald
  • N Tung
  • WD Foulkes
  • K Offit
  • R Gershoni
  • M Daly
  • C Kim-Sing
  • Håkan Olsson
  • P Ainsworth
  • A Eisen
  • H Saal
  • E Friedman
  • O Olopade
  • M Osborne
  • J Weitzel
  • H Lynch
  • P Ghadirian
  • J Lubinski
  • P Sun
  • SA Narod
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Summary, in English

Women with a mutation in BRCA1 or BRCA2 face a lifetime risk of breast cancer of similar to 80%, and following the first diagnosis the 10-year risk of contralateral breast cancer is similar to 30%. It has been shown that both tamoxifen and oophorectomy prevent contralateral breast cancer, but it is not clear whether there is a benefit in giving tamoxifen to women who have previously undergone an oophorectomy. Furthermore, the relative degree of protection in BRCA1 and BRCA2 carriers has not been well evaluated. We studied 285 women with bilateral breast cancer and a BRCA1 or BRCA2 mutation, and 751 control women with unilateral breast cancer and a BRCA1 or BRCA2 mutation in a matched case-control study. Control women were of similar age and had a similar age of diagnosis of breast cancer and had been followed for as long as the case for a second primary breast cancer. The history of tamoxifen use for treating the first breast cancer was compared between bilateral and unilateral cases. The multivariate odds ratio for contralateral breast cancer associated with tamoxifen use was 0.50 for carriers of BRCA1 mutations (95% CI, 0.304.85) and was 0.42 for carriers of BRCA2 mutations (95% CI, 0.17-1.02). The protective effect of tamoxifen was not seen among women who had undergone an oophorectomy (OR = 0.83; 95% CI, 0.242.89) but this subgroup was small. In contrast, a strong protective effect of tamoxifen was apparent among women who were premenopausal or who had undergone natural menopause (OR = 0.44; 95% CI, 0.27-0.65). (c) 2005 Wiley-Liss, Inc.

Publishing year

2006

Language

English

Pages

2281-2284

Publication/Series

International Journal of Cancer

Volume

118

Issue

9

Document type

Journal article

Publisher

John Wiley & Sons Inc.

Topic

  • Cancer and Oncology

Keywords

  • BRCA2
  • oophorectomy
  • breast cancer
  • tamoxifen
  • BRCA1

Status

Published

ISBN/ISSN/Other

  • ISSN: 0020-7136