... Non-dietary factors as risk factors for breast cancer, and as effect modifiers of the association of fat intake and risk of breast cancer. Cancer Causes Control, 8, pp4 9-5 6.18 Collaborative ... proliferation of breast cancer cells15,16. In fact, the longer oestrogen is circulating in a woman’s body, the greater the risk of developing breast cancer. For example, it is well known that the ... having fewer children later in life, or no children at all. Research indicates that breastfeeding also reduces breast cancer risk and that the longer a woman breastfeeds, the greater the...