What is the most common type of breast cancer diagnosed?

The most common type of breast cancer diagnosed is infiltrating ductal carcinoma. This type represents approximately 80% of all breast cancer cases and originates from the cells lining the ducts of the breast. Its designation as "infiltrating" or "invasive" indicates that the cancer has penetrated the walls of the duct and is capable of spreading to surrounding breast tissue. The fact that it accounts for such a high proportion of breast cancer diagnoses underlines its prevalence and significance in the context of breast cancer awareness and treatment.

In contrast, lobular carcinoma, while still a notable type of breast cancer, is less common and accounts for about 10-15% of cases. In situ carcinoma refers to cancers that are confined to their original location and have not invaded surrounding tissues, which makes it a different category altogether, though certain forms can be considered precursors to invasive cancer. Paget's disease of the breast is very rare and primarily involves the skin of the nipple, often associated with underlying ductal carcinoma but not a distinct form of breast cancer in itself.

In summary, infiltrating ductal carcinoma's prevalence and its invasive nature make it the most frequently diagnosed type of breast cancer, promoting its recognition as a key focus in screening and treatment strategies