# OnCo record ibis-i (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/ibis-i/>
  a schema:MedicalTrial ;
  onco:kind "trial" ;
  schema:identifier "ibis-i", "ISRCTN91879928" ;
  schema:name "IBIS-I (International Breast Intervention Study I)"@en ;
  schema:alternateName "IBIS-1"@en, "ISRCTN91879928"@en ;
  schema:description "The UK-led prevention trial that showed five years of tamoxifen keeps preventing breast cancer for at least twenty years, and the reason NICE tells the NHS to offer it to premenopausal women at high familial risk."@en ;
  schema:url <https://onco.cc/trials/ibis-i/> ;
  schema:dateModified "2026-09-25"^^xsd:date ;
  schema:citation <https://doi.org/10.1016/S1470-2045(14)71171-4>, <https://www.isrctn.com/ISRCTN91879928>, <https://www.nice.org.uk/guidance/cg164/chapter/Recommendations> ;
  onco:status "positive" ;
  onco:tag "uk", "breast", "prevention" ;
  onco:phase "3" ;
  onco:cancers <https://onco.cc/cancers/breast-cancer/> ;
  onco:drugs <https://onco.cc/drugs/tamoxifen/> ;
  onco:people <https://onco.cc/people/jack-cuzick/> .