Early menstruation and fertility of women with a higher risk of breast cancer

Japan's Health Ministry research team released a large-scale survey shows that as early as age of menarche, not fertility, menopause late Japanese women suffering from breast cancer in high-risk.

According to Japan's "Yomiuri Shimbun" published in the evening, the Japanese National Cancer Center Research Department is responsible for the prevention of Kim Chang-person research team led by Koizumi in 1990 and 1993, then aged 40

- Year-old to 60 years of a total of about 55,000 women targeted implementation of investigation and tracking of these women's breast cancer incidence until 2002.

According to the study of the number of people suffering from breast cancer, the researchers sorted out a series of data: in the absence of post-menopausal women, age at menarche in women over the age of 16, the risk of breast cancer than there is less than 14-year-old menarche The women about 25 percent lower; fertility of women has not been the risk of developing breast cancer than women of childbearing too high 70%.

Research has been in the post-menopausal women, postmenopausal women over the age of 54-year-old woman, the risk of breast cancer before menopause than the 48-year-old female high times that of female fertility has not been the risk of developing breast cancer than women have high fertility 1.2 times.

Japanese researchers pointed out that some medical experts believe that higher estrogen levels of women suffering from breast cancer risk is relatively high. The estrogen levels and whether the level of fertility and menarche, the menopause sooner or later, so this survey to a certain extent, confirmed the high and low estrogen levels and the risk of breast cancer the link between