<prompt> TRUEFALSE about risk factor of carcinoma breast: 1. Nulliparity 2. Multiparity 3. BRCA1 mutation 4. Family history1,2,3 true 4 false1 false 2,3,4 true1,3,4 true 2 falseAll are true  <response>: Multiparity is not a risk factor for CA breast. Magnitude of Known Breast Cancer Risk Factors Relative risk2 Relative risk 2-4 Relative risk4 Early menarche One-first degree relative with breast cancer Mutation BRCA 1 or BRCA 2 Late menopause CHEK2 mutation LCIS Nulliparity Age 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 FM 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 9e page 437 ; sabiston 18e page 862. 