# OnCo record idea-bio2-ctdna-six-week-io-switch (idea). 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/ideas/idea-bio2-ctdna-six-week-io-switch/>
  a schema:CreativeWork ;
  onco:kind "idea" ;
  schema:identifier "idea-bio2-ctdna-six-week-io-switch" ;
  schema:name "Use a blood test at six weeks to decide whether to keep going"@en ;
  schema:description "Scans at three months often cannot tell whether immunotherapy is working. A blood test at six weeks may give a clearer, earlier answer."@en ;
  schema:url <https://onco.cc/ideas/idea-bio2-ctdna-six-week-io-switch/> ;
  schema:dateModified "2026-09-08"^^xsd:date ;
  schema:citation <https://doi.org/10.1001/jamanetworkopen.2019.2535> ;
  onco:related <https://onco.cc/ideas/idea-cd8-pet-io/>, <https://onco.cc/ideas/idea-ctdna-switch-generalised/> ;
  onco:cancers <https://onco.cc/cancers/nsclc/>, <https://onco.cc/cancers/melanoma/>, <https://onco.cc/cancers/urothelial/> ;
  onco:technologies <https://onco.cc/technologies/liquid-biopsy/>, <https://onco.cc/technologies/mrd-testing/>, <https://onco.cc/technologies/checkpoint-inhibitor/> ;
  onco:terms <https://onco.cc/terms/ctdna/>, <https://onco.cc/terms/recist/>, <https://onco.cc/terms/pfs/> ;
  onco:bottlenecks <https://onco.cc/bottlenecks/b-immunotherapy-response/>, <https://onco.cc/bottlenecks/b-drug-pricing/>, <https://onco.cc/bottlenecks/b-trial-design/> ;
  onco:keyPapers <https://onco.cc/key-papers/paper-haslam-jama-netw-open/> .