# OnCo record her2-low-ihc (biomarker). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)". Whole corpus: https://onco.cc/api/v1/onco.nt
@prefix schema: <https://schema.org/> .
@prefix onco: <https://onco.cc/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://onco.cc/biomarkers/her2-low-ihc/>
  a schema:MedicalTest ;
  onco:kind "biomarker" ;
  schema:identifier "her2-low-ihc" ;
  schema:name "HER2-low (IHC 1+ or IHC 2+/ISH-negative)"@en ;
  schema:alternateName "HER2-low breast cancer"@en, "HER2-low readout"@en, "IHC 1+ or 2+/ISH-"@en, "HER2 low expression"@en, "HER2-low (IHC 1+ or IHC 2+/ISH-)"@en ;
  schema:description "HER2-low is not a new stain but a new reading of the old one: 1+ or 2+ without gene amplification. It covers about half of breast cancers and makes them eligible for trastuzumab deruxtecan."@en ;
  schema:url <https://onco.cc/biomarkers/her2-low-ihc/> ;
  schema:dateModified "2026-09-23"^^xsd:date ;
  schema:citation <https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=7e67e73e-ddf4-4e4d-8b50-09d7514910b6> ;
  onco:tag "biomarker", "her2" ;
  onco:related <https://onco.cc/biomarkers/her2-ihc-1-plus/>, <https://onco.cc/biomarkers/her2-ihc-2-plus/>, <https://onco.cc/biomarkers/her2-ultralow/> ;
  onco:cancers <https://onco.cc/cancers/her2-low-metastatic-breast-cancer/>, <https://onco.cc/cancers/breast-hr-positive/>, <https://onco.cc/cancers/tnbc-metastatic/>, <https://onco.cc/cancers/breast-cancer/> ;
  onco:drugs <https://onco.cc/drugs/trastuzumab-deruxtecan/>, <https://onco.cc/drugs/her2-testing-assays/> ;
  onco:terms <https://onco.cc/terms/her2-low/>, <https://onco.cc/terms/ihc/>, <https://onco.cc/terms/fish/> .