To increase the age at menarche, lower the age at first birth, and are linked to increased parity and breastfeeding with low risk of breast cancer in the general population [9-12]. However, after each pregnancy there is a transient increase in the risk of breast cancer [13-15]. And thus the strength and direction of the effects of pregnancy are related to time since last birth, and thus present them differently according to whether the women studied are of childbearing age [12]. Moreover, these associations function any of the BRCA gene disruption may be affected [16-20] but the picture emerging from a small number of studies published so far are still far from clear. Further studies in this area are important because they may increase our understanding of the function of genes, as well as the effects of modifying factors on the risk in the boom companies.
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