Types of Breast Cancers
Primary breast cancers are predominantly carcinomas (malignancies derived from epithelial cells). The majority can be further described as adenocarcinomas (a type of carcinoma in glandular cells or appearing in a glandlike pattern). Other types of cancer that may occur in the breast include stromal tumors, lymphomas, and metastases from other sites.
The two major subtypes of breast cancer are ductal and lobular carcinomas. Ductal and lobular carcinomas may be further classified as either in situ (non-invasive) or invasive.
In situ breast carcinomas are defined by the presence of malignant epithelial cells within the ducts, lobules, or terminal ductal lobular unit, with no extension beyond the basement membrane. Components of in situ carcinoma can often be found within invasive carcinomas.
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