What are breast cancer subtypes?
Breast cancer subtype information comes from a test that is done on your tumor tissue, called ‘immunohistochemistry’, or ‘IHC’. It usually appears on the first page of your records. Look for the terms “ER”, “Estrogen Receptor”, “PR” or “HER2”. Sometimes it would be stated clearly if you are negative or positive for any of these.
- Estrogen Receptor positive (ER+)
- Progesterone Receptor positive (PR+)
- HER2 positive (HER2+)
- Triple Negative Breast Cancer (TNBC)
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