35 at first bih Atypical hyperplasia Estrogen plus progesterone Proliferative breast disease Radiation exposure 40 H Mammographic breast density Alcohol use Postmenopausal obesity H, hormone replacement therapy; LCIS, lobular carcinoma in situ Risk Factor For Breast Cancer Factor impoant in population Age at menarche Parity Age at first Bih Breast- feeding Exogenous hormone use or exposure Alcohol consumption Factor impoant in individual Patients Gender ( F>>M) Age ( steady increase with age Family history ( mothers, sisters, daughters) History of previous breast cancer ( noninvasive or invasive, ipsilateral or contralateral) Histological risk factor Proliferative breast disease Atypical ductal hyperplasia (ADH) Atypical Lobular hyperplasia (ALH) Lobular carcinoma in situ (LCIS) Ref: Schwaz 9/e page 437 ; sabiston 18/e page 862.">