Risk factors for early age at breast cancer onset : The COSA program population-based study

Breast cancer is the most frequent cancer in women in western countries. A number of risk factors are now known, but the etiology of the disease is not fully understood. The aim of this study was to determine the effects of reproductive, anthropometric and environmental factors on cancer onset. 934...

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Bibliographic Details
Published in:Anticancer research 2007-03, Vol.27 (2), p.1087-1094
Main Authors: DELORT, Laetitia, KWIATKOWSKI, Fabrice, CHALABI, Nasséra, SATIH, Samir, BIGNON, Yves-Jean, BERNARD-GALLON, Dominique J
Format: Article
Language:English
Subjects:
Adult
Aged
Analysis of Variance
Anthropometry
Biological and medical sciences
Breast Neoplasms - epidemiology
Breast Neoplasms - etiology
Female
France - epidemiology
Gynecology. Andrology. Obstetrics
Humans
Mammary gland diseases
Medical sciences
Middle Aged
Multivariate Analysis
Reproduction
Risk Factors
Tumors
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Summary:Breast cancer is the most frequent cancer in women in western countries. A number of risk factors are now known, but the etiology of the disease is not fully understood. The aim of this study was to determine the effects of reproductive, anthropometric and environmental factors on cancer onset. 934 women who developed a non-hereditary breast cancer were recruited from different hospitals in the Auvergne region (France) and completed a questionnaire. The use of oral contraceptives (OC) increased the risk of early cancer development (odds ratio = 1.84, 95% confidence interval = 1.38-2.44). The age at first OC use appeared to be a major factor since the risk decreased when OC use was after the age of 23 years (odds ratio = 0.52, 95% confidence interval = 0.34-0.79). A duration of breast-feeding greater than 26 weeks decreased the risk of early cancer development (odds ratio = 0.62, 95% confidence interval = 0.39-0.97). No overall association was found with anthropometric or lifestyle factors and early age at breast cancer onset. OC use, age at first OC use and lactation were significantly associated with an early age at breast cancer onset. Thus, a number of "risk factors" could be considered as "early onset risk factors".
ISSN:0250-7005
1791-7530