Chinese Academy of Medical Sciences cancer hospital director Xu Binghe
why get breast cancer
at present, there are about 1 million 400 thousand people suffering from breast cancer, the global annual average of about 20 million new cases every year in our country. Breast cancer has become the number one killer of women’s health".
in China, the incidence rate of breast cancer in coastal areas is higher than that in the mainland, the eastern region is higher than the west, and the city is higher than the rural areas. Among them, the incidence of middle-aged women grew fastest, forming a new peak. According to statistics, the high incidence of female breast cancer in western countries is 55 ~ 65 years old, in China, the advance of the age of 45 ~ 55.
single, childbirth, breast-feeding. After birth or 35 years of age in women of reproductive age, the incidence of breast cancer is higher than before the age of 30 women of reproductive age. At present, one of the most clear risk factors for breast cancer in the medical community is the lack of women, because they lack the protection of progesterone, more vulnerable to excessive estrogen stimulation. In addition, breastfeeding can reduce the risk of breast milk
breast cancer is the result of multiple factors. Women with high risk factors for breast cancer are at higher risk:
has a family history of breast cancer. Epidemiological survey found that 5% to 10% of breast cancer is familial. Especially in the mother or sister, if suffering from breast cancer, then the family belongs to high-risk groups, the risk of disease than the general population increased by 2 ~ 3 times.
female life experience menarche, pregnancy, lactation, menopause several important moments, are accompanied by changes in estrogen. Most people in the age of menarche was 12 to 14 years of age; family best age is 25 to 35 years of age; menopause for 45 ~ 55 years old. If estrogen levels are consistent with these changes, it will not cause an abnormal effect on the body. But if someone or external factors (such as excessive estrogen, pregnant or breastfeeding) of these stages, leading to a sudden change in estrogen levels, as originally smooth car suddenly slammed on the throttle or brakes, the car transmission system caused by impact damage, the hormone will change suddenly stimulation of mammary epithelial cells induced by lead, malignant, breast cancer.
early menarche, late menopause. The first menstruation before the age of 12, menopause after the age of 55 people belonging to high-risk groups, their risk of breast cancer 1 to 2 times higher than that of the general population, because the breast by estrogen action time is too long, easily lead to breast cancer.
who is prone to breast cancer
is not entirely clear about the causes of breast cancer. However, a large number of clinical epidemiological studies have shown that estrogen is closely related to the occurrence of breast cancer. Estrogen is a physiological hormone, usually at a relatively constant speed or a certain rhythm to release, like a uniform, smooth driving on the road car. Once the law is disturbed by the outside world, the normal fluctuation of the hormone level will be disturbed.