Spontaneous and therapeutic abortions and the risk of breast cancer among BRCA mutation carriers.

Abstract:

INTRODUCTION:BRCA1 and BRCA2 mutation carriers are at increased risk for developing both breast and ovarian cancer. It has been suggested that carriers of BRCA1/2 mutations may also be at increased risk of having recurrent (three or more) miscarriages. Several reproductive factors have been shown to influence the risk of breast cancer in mutation carriers, but the effects of spontaneous and therapeutic abortions on the risk of hereditary breast cancer risk have not been well studied to date. METHODS:In a matched case-control study, the frequencies of spontaneous abortions were compared among 1,878 BRCA1 mutation carriers, 950 BRCA2 mutation carriers and 657 related non-carrier controls. The rates of spontaneous and therapeutic abortions were compared for carriers with and without breast cancer. RESULTS:There was no difference in the rate of spontaneous abortions between carriers of BRCA1 or BRCA2 mutations and non-carriers. The number of spontaneous abortions was not associated with breast cancer risk among BRCA1 or BRCA2 mutation carriers. However, BRCA2 carriers who had two or more therapeutic abortions faced a 64% decrease in the risk of breast cancer (odds ratio = 0.36; 95% confidence interval 0.16-0.83; p = 0.02). CONCLUSION:Carrying a BRCA1 or BRCA2 mutation is not a risk factor for spontaneous abortions and spontaneous abortions do not appear to influence the risk of breast cancer in carriers of BRCA1 or BRCA2 mutations. However, having two or more therapeutic abortions may be associated with a lowered risk of breast cancer among BRCA2 carriers.

journal_name

Breast Cancer Res

authors

Friedman E,Kotsopoulos J,Lubinski J,Lynch HT,Ghadirian P,Neuhausen SL,Isaacs C,Weber B,Foulkes WD,Moller P,Rosen B,Kim-Sing C,Gershoni-Baruch R,Ainsworth P,Daly M,Tung N,Eisen A,Olopade OI,Karlan B,Saal HM,Garber

doi

10.1186/bcr1387

keywords:

subject

Has Abstract

pub_date

2006-01-01 00:00:00

pages

R15

issue

2

eissn

1465-5411

issn

1465-542X

pii

bcr1387

journal_volume

8

pub_type

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