乳腺癌的易患因素雌激素体内存在时间长初潮太早,比如12岁、13岁之前就已经来了第一次月经;绝经晚,52岁以后才绝经,雌激素在人的体内存在的时间比较长。未婚、未育、未哺乳35岁以上,未婚、未育、未哺乳的女性是一个易患人群。因为乳腺的发育需要一个妊娠的过程,大概需要超过6个月的哺乳,来完成乳腺的发育。如果未婚、未育、未哺乳,那么乳 Predisposing factors for breast cancer Estrogen exists in the body for a long time before menarche too early, such as 12 years old, before the age of 13 had the first menstruation; menopause late, 52 years after menopause, estrogen in the body's existence time longer. Unmarried, not educated, not breastfeeding women over 35 years old, unmarried, not educated, not breastfeeding women is a susceptible population. Because the development of the breast needs a pregnancy process, probably takes more than 6 months of breast-feeding to complete the development of the breast. If unmarried, not educated, not breastfeeding, then milk