Breast cancer is the commonest cancer affecting women. A woman in the developed world has a lifetime risk of developing breast cancer of approximately 9-11%. In 2009, over 48,000 women in the UK were diagnosed with breast cancer. Each year,about 350 men are also diagnosed with breast cancer.The risk of developing breast cancer for women in the general population increases with age. Other factors known to increase the risk include the use of hormone replacement therapy (HRT),especially combined oestrogen and progesterone preparations,hormonal contraceptives, obesity and alcohol. High parity,young age at first childbirth, breastfeeding, late menarche and early menopause all decrease the risk