Breast cancer is a malignant tumor that occurs from the ductal epithelium of the breast and is a common malignant tumor in women. In many western countries, the incidence of breast cancer accounts for the first place among female cancers. In China, breast cancer accounts for the top two of female malignant tumors. According to relevant data, the incidence rate is 23/100,000 in women and 0.49/100,000 in men.
Men's breast cancer accounts for about 1% of breast cancer. Most breast cancers occur in women between the ages of 40 and 60, or before and after menopause, and have the highest incidence among 45 to 49 and 60 to 64 years of age.
What is the cause of breast cancer?
Analysis of the occurrence of breast cancer from current clinical practice and animal experiments and other relevant data is related to the following factors:
(1) Hormone secretion disorder: The so-called hormone secretion disorder mainly refers to the disorder of secretion of estrogen. Because of the high age of breast cancer is 40 to 60 years old women. This age period is the period when women's estrogen secretion is imbalanced and estrogen levels are high. Due to the increased secretion of estrogen in the body, this can cause hyperplasia of breast ductal epithelial cells and canceration.
(2) Fertility and lactation: In recent years, a large number of investigations have shown that women who have little breast-feeding without fertility or fertility have breast cancer more often than women with multiple breast-feeding periods. This shows that multiple births, multiple breastfeeding may increase the chance of breast cancer.
(3) Fibrocystic breast disease: As mentioned earlier, this lesion is a precancerous lesion that can easily transform into breast cancer.
(4) Genetic factors: mainly in the family history of breast cancer. According to foreign data, positive family history can be manifested in two forms: one for mothers with breast cancer, and the other for daughters with breast cancer. This type of breast cancer often occurs before menopause and is often bilateral; the other is The mother has not had breast cancer, but in one family, at least two sisters have breast cancer. The incidence of breast cancer in this family is two to three times higher than that in families without a family history, and This type of breast cancer often occurs after menopause and is often unilateral.
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