# OnCo record ma-20 (trial). 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/trials/ma-20/>
  a schema:MedicalTrial ;
  onco:kind "trial" ;
  schema:identifier "ma-20", "NCT00005957" ;
  schema:name "NCIC MA.20"@en ;
  schema:description "MA.20, published alongside EORTC 22922, showed that adding nodal irradiation after lumpectomy improves disease-free survival, mainly by preventing distant spread, without a survival difference at ten years."@en ;
  schema:url <https://onco.cc/trials/ma-20/> ;
  schema:dateModified "2026-09-17"^^xsd:date ;
  schema:citation <https://clinicaltrials.gov/study/NCT00005957>, <https://doi.org/10.1056/NEJMoa1415340> ;
  onco:status "positive" ;
  onco:tag "radiation-wave4" ;
  onco:phase "3" ;
  schema:startDate "2000-03-09" ;
  onco:cancers <https://onco.cc/cancers/breast-hr-positive/>, <https://onco.cc/cancers/breast-her2-positive/>, <https://onco.cc/cancers/tnbc/>, <https://onco.cc/cancers/breast-cancer/> ;
  onco:technologies <https://onco.cc/technologies/imrt-igrt/> ;
  onco:companies <https://onco.cc/companies/cctg/> ;
  onco:terms <https://onco.cc/terms/radiation-pneumonitis/>, <https://onco.cc/terms/post-mastectomy-radiotherapy/> ;
  onco:trials <https://onco.cc/trials/eortc-22922/>, <https://onco.cc/trials/supremo/>, <https://onco.cc/trials/nsabp-b51/> ;
  onco:keyPapers <https://onco.cc/key-papers/paper-ma-20-n-engl-j-med-2015/> .