4、22Personalhistoryofcancer9Bloodandrogenlevels(high)23Prolactinhormonelevels(high)10Bloodestrogenlevels(high) aftermenopause24Raceandethnicity11Bodyweight(heavier)aftermenopause25Radiationexposurefrommedicalimaging12Bonedensity(high)26Radiationtreatmentduringyouth13BRCA1 or BRCA2 genemutation27Weig