# OnCo record cd38-expression (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/cd38-expression/>
  a schema:MedicalTest ;
  onco:kind "biomarker" ;
  schema:identifier "cd38-expression" ;
  schema:name "CD38 expression"@en ;
  schema:alternateName "CD38"@en, "CD38-positive"@en, "CD38 expression myeloma"@en ;
  schema:description "CD38 is on almost every myeloma cell, so daratumumab and isatuximab are given without testing for it. The stain matters afterwards: CD38 falls after treatment and can confuse flow cytometry and blood typing."@en ;
  schema:url <https://onco.cc/biomarkers/cd38-expression/> ;
  schema:dateModified "2026-09-23"^^xsd:date ;
  schema:citation <https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=a4d0efe9-5e54-467e-9eb4-56fa7d53b60b> ;
  onco:tag "biomarker", "surface-antigen", "no-threshold" ;
  onco:related <https://onco.cc/biomarkers/bcma-expression/>, <https://onco.cc/biomarkers/gprc5d-expression/> ;
  onco:cancers <https://onco.cc/cancers/multiple-myeloma/>, <https://onco.cc/cancers/myeloma-transplant-eligible/>, <https://onco.cc/cancers/myeloma-transplant-ineligible/>, <https://onco.cc/cancers/myeloma-relapsed-refractory/> ;
  onco:drugs <https://onco.cc/drugs/daratumumab/>, <https://onco.cc/drugs/isatuximab/> ;
  onco:terms <https://onco.cc/terms/flow-cytometry/> .