Historical overview of breast cancer

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Breast cancer of the breast ductal epithelial cells in various internal and external factors of cancer, the cells are deprived of the normal characteristics of dysplasia, which exceeds the limits of self-repair and premalignant disease. Clinical breast lumps for a major performance. Female breast cancer is the most common malignant one. With the high incidence of quite aggressive, but slow progress in the course. Longer survival natural characteristics belong to the medical milk tumor "of rock" and so on.

Breast cancer is harmful to the health of women mainly cancer worldwide each year, about 1.2 million women occurred breast cancer, half a million women die of breast cancer. In North America, the Nordic breast cancer is high, their incidence rate is about Asia, Africa and Latin America four times. Although China is a low-fat breast cancer, but its incidence is increasing every year, especially in Shanghai, Beijing and Tianjin is China's coastal areas and the high incidence of breast cancer, the highest in Shanghai, Shanghai in 1972 of breast cancer incidence rate of 20.1/10 million, in 1988 compared with 10,000 28/10, yes female malignancy in paragraph 2.

Breast cancer occurred mainly in the female, male rare, the incidence of female to male nearly hundredfold.

Etiology
Breast cancer causes more relevant factors, common risk factors are :
An age of menarche and menopause age, the early middle age.
2, family history.
3, a benign breast diseases.
4, dietary factors and obesity.
5, endocrine factors and hormones.
6, ionizing radiation.
7, unhealthy living habits.
Eight virus infections.

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