What are the characteristics of the regional distribution of breast cancer?

The incidence of breast cancer has obvious geographical distribution characteristics. From the global distribution, the higher the geographical latitude, the higher the incidence. Most Asian and African countries belong to low-incidence areas; Southern Europe and South America belong to medium-developed areas; North America and northern Europe belong to high incidence areas. The incidence of breast cancer in China is low.

In the same country or in the same latitude area, the incidence rate is not the same, generally speaking, cities are higher than rural areas. According to incomplete statistics in China, the incidence and mortality of breast cancer in Shanghai, Beijing and Tianjin are almost 3-4 times that in Tibet and Qinghai.

Foreign scholars have studied the incidence of breast cancer among immigrants of the same race, and found that the incidence of breast cancer can change because of immigrants of the same race. The incidence of breast cancer in China and Japanese who immigrated to the mainland of the United States and Hawaiian Islands was significantly higher than that of the second and third generation women who still lived in their original nationality, which was close to the level of immigrants. The incidence of breast cancer in Jewish women born in Europe and America is higher than that in the host country, while the incidence of breast cancer in Jewish women born in Africa and Asia is lower. Moving from high-incidence area to low-incidence area, or from low-incidence area to high-incidence area, can reflect that the incidence of breast cancer is developing to the average level of local people in immigrant countries in the second and third generations. Environmental factors in different regions have an important influence on the incidence of breast cancer.

As can be seen from the above data, in addition to the influence of magnetic field and climate, the living environment and living habits in the region are also important factors directly related to the incidence of breast cancer. Therefore, it is of great significance to change some bad living habits and improve the bad living environment to reduce the incidence of breast cancer.