Having your first pregnancy after age 30, never having a full-term pregnancy, and not breastfeeding are also linked to an increased risk of developing breast cancer. Starting menstruation before age 12 or menopause after age 55 is linked to an increased risk of developing breast cancer due to an increased amount of time exposed to elevated estrogen levels. Women with a first-degree relative with breast cancer have a 1.75-fold higher chance of developing breast cancer than women who don’t have an affected close relative. Nearly 25 percent of breast cancer cases are linked to family history. In 2016, approximately 99.3 percent of breast cancer cases occurred in women over age 40, and 71.2 precent occurred in women over age 60. Your chances of developing breast cancer also increase with age. People assigned female sex at birth have a much higher chance of developing breast cancer than males. However, a number of risk factors have been identified. Researchers still don’t fully understand why breast cancer develops in some people but not others. What are the known risk factors for breast cancer? It also has the potential to spread to distant parts of your body if not treated early. It occurs when cancer begins in the glands that produce milk and spread to nearby tissue. Invasive lobular carcinoma tends to be harder to detect than invasive ductal carcinoma. About 1 in 5 women have it in both breasts. Invasive lobular carcinoma makes up about 10 percent of breast cancers. If not caught early, it can potentially spread to other parts of your body through the lymphatic system. It occurs when cancer cells spread from your milk ducts into the surrounding breast tissue. Invasive ductal carcinoma is the most common type of breast cancer and makes up about 50 to 70 percent of breast cancers. Invasive breast cancer occurs when cancer cells spread from the ducts and glands into your breast’s fat or connective tissue. It’s important to note that lobular carcinoma in situ often doesn’t show up on mammograms. It’s considered a benign condition, but it increases your risk of some types of breast cancer later on. Lobular carcinoma in situ is an uncommon condition characterized by abnormal cells in the glands that produce milk. It makes up about 1 in 5 cases of breast cancer in the United States.Ībout 20 to 53 percent of women with ductal carcinoma in situ develop invasive breast cancer. Ductal carcinoma in situĭuctal carcinoma in situ is when cancer is limited to the ducts of your breasts. Within this class, there are a few different types. In situ breast cancerīreast cancer is classified as in situ when it’s contained to the milk ducts or glands and hasn’t spread to other breast tissue. Taking hormone replacement therapy (estrogen plus progestin) for more than 5 years.There are many types of breast cancer.Beginning to menstruate at an early age.In post-menopausal women: obesity and physical inactivity.No full term pregnancies or having a full term first pregnancy after age 30.Previous breast disorders with biopsies showing abnormal cells.Family history of breast cancer, especially in a mother, sister or daughter diagnosed before menopause, or if a mutation on the BRCA1 or BRCA2 genes is present.Age: 83% of the cases of breast cancer occur in women over 50 years of age.There is no single cause of breast cancer but some factors that increase the risk of developing the disease include: ![]() Please refer to the Breast Cancer in Canada infographic for more information. Ductal carcinoma is the most common type of breast cancer, accounting for approximately 90% of all in situ breast carcinomas and 70% of all invasive breast carcinomas. Cancer cells may start within the ducts (ductal carcinoma) or lobules (lobular carcinoma).
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