Major factors that induced in breast cancer
1.Age:
In women the incidence rises with age and is rare in pre-menarche,as well as before the age of 20.However, after the age of 20 it increases rapidly in incidence, 45 ~ 50-year-old to a high level, but was relatively flat.Postmenopausal incidence continues to rise to 70-year-old and then reachs the peak.Meanwhile the mortality also increases with age,and it rises gradually after 25 years old until old age and always maintain an upward trend.
2.Genetic factors:
Women in whose family has breast cancer medical history in the first-class straight pro-family,their breast cancer's risk is normal crowd's 2~3 times.
3.Other breast diseases
4.The age when the first menstruation comes:
The women whose age when the first menstruation comes is younger than 13 years old have a 2.2 times risk than whose that age is older than 17.
5.post-menopausal age:
Women whose menopausal age is greater have an increased risk than whose that age is younger than 45 years old.
6.First pregnancy age:
The risk advances gradually along with the first birth age postpones.Women whose first birth age is older than 35 will has higher risk than the non-birth ones.
7.After the menopause, supplements the estrogen:
During the menopause has a long-term use of estrogen may increase the risk of breast cancer.
8.Oral administration contraceptives
9.Food:
In particular the fat diet can increase the risk of breast cancer.
10.Drinking
11. Weight's gaining is probably an important risk factor for post-menopausal women to suffer from breast cancer.
