# OnCo record her2-ultralow (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-ultralow/>
  a schema:MedicalTest ;
  onco:kind "biomarker" ;
  schema:identifier "her2-ultralow" ;
  schema:name "HER2-ultralow (IHC 0 with membrane staining)"@en ;
  schema:alternateName "HER2-ultralow"@en, "HER2 ultralow"@en, "ultralow"@en, "IHC 0 with faint staining"@en, "IHC >0 <1+"@en ;
  schema:description "HER2-ultralow is an IHC 0 result with a trace of membrane staining in a few cells. Since 2025, in hormone-receptor-positive breast cancer that has stopped responding to hormone therapy, it is enough for trastuzumab deruxtecan."@en ;
  schema:url <https://onco.cc/biomarkers/her2-ultralow/> ;
  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-0/>, <https://onco.cc/biomarkers/her2-low-ihc/> ;
  onco:cancers <https://onco.cc/cancers/her2-low-metastatic-breast-cancer/>, <https://onco.cc/cancers/breast-hr-positive/> ;
  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/> .