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5 slides generated from the cancer page, with a quiz from the open benchmark and speaker notes that cite the sources. Arrow keys move between slides; Print gives one slide per page.
Invasive carcinoma of no special type, still widely called invasive ductal carcinoma, is the ordinary form of breast cancer and by far the most common. The name means the tumour has no special pattern that would put it in one of the rarer types; everything on the main breast cancer page and its receptor subpages is written about this type unless it says otherwise.
The WHO classification uses invasive breast carcinoma of no special type for the large group of adenocarcinomas that cannot be classified as a special histological type; the 2019 edition keeps the term, treats the former medullary, oncocytic, lipid-rich, glycogen-rich, sebaceous and pleomorphic carcinomas as patterns within it, and grades it by the Nottingham system (Tan 2020). It is then divided clinically by oestrogen receptor, progesterone receptor and HER2 status and, in early disease, by genomic assays such as Oncotype DX, which is how the corpus's HR-positive, HER2-positive and triple-negative pages and their subpages are organised.
How it differs from its parent: it is not a subtype so much as the default; the special types on the sibling pages (lobular, tubular, mucinous, cribriform, papillary, secretory, adenoid cystic, apocrine, micropapillary, metaplastic, neuroendocrine) are defined against it and several carry a better or worse prognosis than grade-matched no special type disease.
| Setting | Approach | Guideline |
|---|---|---|
| All stages | Treated as the parent's receptor pages describe. | not mapped |