NON-MODIFIABLE RISK FACTORS   MODIFIABLE RISK FACTORS    Gender   Age   Personal breast cancer history   Family history   Proliferative breast conditions   Breast density   Early menstruation/ Late menopause    Radiation exposure   Reproduction > Breastfeeding   Hormone replacement therapy   Oral contraceptives   Body weight   Physical activity   Alcohol use   Tobacco smoke (for younger women)

BREASTFEEDING

Women who breastfeed, particularly for longer periods of time such as a year or more, have a lower risk for breast cancer. It does not matter if the period of breastfeeding is for one child, or combined over more than one birth. The effect of breastfeeding on breast cancer risk may be related to breastfeeding lowering a woman’s total number of menstrual periods over her life.