Age at first birth and the risk of breast cancer in BRCA1 and BRCA2 mutation carriers.
Breast Cancer Res Treat
; 105(2): 221-8, 2007 Oct.
Article
em En
| MEDLINE
| ID: mdl-17245541
ABSTRACT
An early age at first full-term birth is associated with a reduction in the subsequent development of breast cancer among women in the general population. A similar effect has not yet been reported among women who carry an inherited BRCA1 or BRCA2 mutation. We conducted a matched case-control study on 1816 pairs of women with a BRCA1 (n = 1405) or BRCA2 (n = 411) mutation in an attempt to elucidate the relationship between age at first full-term pregnancy and the risk of developing breast cancer. Information about the age at first childbirth and other pregnancy-related variables was derived from a questionnaire administered to women during the course of genetic counselling. There was no difference in the mean age at first full-term birth in the cases and controls (24.9 years vs. 24.8 years; P = 0.81, respectively). Compared to women whose first child was born at or before 18 years of age, a later age at first full-term birth did not influence the risk of developing breast cancer (OR = 1.00 per year; 95% CI 0.98-1.03; P-trend = 0.67). Stratification by mutation status did not affect the results. These findings suggest that an early first full-term birth does not confer protection against breast cancer in BRCA mutation carriers. Nonetheless, BRCA mutation carriers opting for a prophylactic oophorectomy as a breast and/or ovarian cancer risk-reducing strategy should complete childbearing prior to age 40 when this prevention modality is most effective.
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Coleções:
01-internacional
Temas:
Geral
/
Prevencao_e_fatores_de_risco
/
Hereditariedade
/
Saude_da_mulher
/
Mama
/
Tipos_de_cancer
/
Mama
/
Outros_tipos
Base de dados:
MEDLINE
Assunto principal:
Complicações Neoplásicas na Gravidez
/
Neoplasias da Mama
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Genes BRCA1
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Predisposição Genética para Doença
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Genes BRCA2
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Mutação
Tipo de estudo:
Clinical_trials
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Etiology_studies
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Observational_studies
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Risk_factors_studies
Limite:
Adolescent
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Adult
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Female
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Humans
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Middle aged
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Pregnancy
Idioma:
En
Revista:
Breast Cancer Res Treat
Ano de publicação:
2007
Tipo de documento:
Article
País de afiliação:
Canadá