In Situ versus Invasive Breast Cancer
Breast cancer is a type of cancer that occurs when the cells in a person's breast start growing uncontrollably.
In situ breast cancer is a type of breast cancer that starts in the milk ducts and remains localized, meaning it does not spread to the surrounding breast tissues. It is considered a non-invasive or pre-invasive form of breast cancer. One specific type of in situ breast cancer is called ductal carcinoma in situ (DCIS)
On the other hand, invasive breast cancer has the potential to spread into the surrounding breast tissues. It includes invasive ductal carcinoma and invasive lobular carcinoma. Invasive breast cancer is more advanced compared to in situ breast cancer because it has the ability to invade and spread to other parts of the body.
Despite their differences, in situ breast cancer and invasive breast cancer share some similarities. Both types of breast cancer can be influenced by certain risk factors. For example, increasing age is highly associated with the incidence of both in situ and invasive breast cancer. Women with a family history of breast cancer are also more prone to developing both types of breast cancer. Additionally, reproductive factors such as early menarche, late menopause, late age at first pregnancy, and low parity can increase the risk of both in situ and invasive breast cancer. Moreover, the levels of estrogen in the body are significantly associated with the risk of both types of breast cancer.
Despite these similarities, there are important differences between in situ and invasive breast cancer. In situ breast cancer remains confined within the milk ducts above the basement membrane without spreading through the walls into nearby breast tissue. In contrast, invasive breast cancer has invaded and spread into surrounding tissues. Invasive breast cancer is considered more serious because it has the potential to metastasize or spread to other parts of the body.
It's important to note that early detection and treatment are key for both types of breast cancer. Regular screenings such as mammograms can help detect both in situ and invasive breast cancers at an early stage when treatment options are more effective. If you have any concerns or questions about your risk for or symptoms of breast cancer, it's always a good idea to consult with your doctor.