C222693Level 9
HER2-Ultralow Breast Carcinoma
**Semantic type:** Neoplastic Process
**Definition:** A breast adenocarcinoma defined by very low expression of HER2.
**Synonyms:** - HER2-Ultra Low Breast Carcinoma - HER2-Ultra-Low Breast Carcinoma - HER2-Ultralow Breast Adenocarcinoma
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