Although being a woman is the main risk factor developing breast cancer, there are also a number of other factors that increase the likelihood that you could develop breast cancer, including   Age: Risk increase with age. Most people who have breast cancer are over 45 years old. Once you reach the age of 50, your risk increases ten-fold for each decade beyond 50.  Menstruation: If you started menstruating before you were 12 years old, or entered menopause when you were older than 55, your risk is slightly increased. In both cases, the risk is higher because of the increased ovulation cycles.  Pregnancy: An early pregnancy or multiple pregnancies can both reduce your risk. Having no children or getting pregnant after the age of 40 increases your risk of developing breast cancer.  Hormone replacement therapy (HRT): Current or previous use for more than 10 years can increase the risk for breast cancer. Obesity, smoking, alcohol use, and shift work are all risk factors for breast cancer.  Whether someone is overweight or obese is determined by using the body mass index (BMI). BMI is a person's weight in kilograms (kg) divided by the square of the person's height in meters (m). A BMI of 25-29.9 is considered overweight, while a BMI greater than 30 is considered obese. A BMI greater than 30 is considered a risk factor for developing breast cancer, since fat cells secrete estrogen, which feeds many breast cancers. There is also some recent evidence that long-term heavy smoking correlates with a higher risk of breast cancer. The risk is especially high among certain groups of smokers, such as women who began smoking before they had their first child. Research is still being conducted to determine the exact relationship between smoking and breast cancer. Alcohol has also been linked to increased risk of developing breast cancer. The risk increases the more you drink alcohol. Women who consume between two and five drinks every day have a 1.5x higher risk than women who don't drink. Recent research has suggested that...

How would you rephrase that briefly using Vietnamese?
Tìm hiểu các yếu tố rủi ro cơ bản của bệnh ung thư vú. Lối sống cũng ảnh hưởng đến khả năng mắc bệnh. Tiền sử bệnh của bản thân và gia đình. Nên nhớ đa số phụ nữ được chẩn đoán ung thư vú KHÔNG có yếu tố rủi ro nào.