Knowledge and understanding among cancer patients consenting to participate in clinical trials

Eur J Cancer. 2008 Nov;44(17):2627-33. doi: 10.1016/j.ejca.2008.08.013. Epub 2008 Sep 23.


The aim of this study was to explore the fulfilment of the requirements of informed consent in patients participating in cancer clinical trials. All patients consenting to a phase II or III clinical trial during one year were included (n=325, 176 women, 54%). Data were collected by a questionnaire, Quality of Informed Consent. The response rate was 87%. High levels of knowledge (>80%) were found for items concerning voluntariness, randomisation, benefits for future patients, participation in a research trial, and the right to withdraw. Less than 50% responded correctly to items about risks associated with the trial, the unproven nature of the trial and issues about insurances. High levels of perceived understanding were reported. Despite high levels of knowledge and perceived understanding in the majority of elements of informed consent, improvements are warranted regarding knowledge about risks, the unproven nature of the treatment and the duration of treatment.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Clinical Trials, Phase II as Topic*
  • Clinical Trials, Phase III as Topic*
  • Comprehension*
  • Female
  • Health Knowledge, Attitudes, Practice
  • Humans
  • Informed Consent*
  • Male
  • Middle Aged
  • Neoplasms / therapy*
  • Surveys and Questionnaires
  • Young Adult