C179553Level 9
HER2-Low Breast Carcinoma
**Semantic type:** Neoplastic Process
**Definition:** A breast adenocarcinoma defined by low expression of HER2 (IHC1+ or IHC2+; FISH negative).
**Synonyms:** - HER2 Low Breast Adenocarcinoma - HER2 Low Breast Carcinoma - HER2-Low Breast Adenocarcinoma
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