Most invasive carcinomas of the breast are invasive carcinoma NST (no special type), also called invasive ductal carcinoma. These account for approximately 65-75 % of invasive carcinomas. The remaining invasive carcinomas are referred to as “special type.” The most common among the special types is invasive lobular carcinoma which is the second [...]

HER2 (also called c-erbB-2) stands for human epidermal growth factor receptor-2. It is a protein on the surface of cells that can be over-expressed (too much of the protein) in approximately 20% of breast cancers. HER2 over-expression is usually associated with a worse prognosis but it also is predictive of response to certain [...]

An invasive, or infiltrating, carcinoma refers to a cancer that has invaded beyond the confines of the ducts and lobules in the breast. This is different from carcinoma in situ, which has not invaded the surrounding breast tissue.
The vast majority of invasive carcinomas are called invasive ductal carcinomas, but also may be referred to as: [...]