Disclosure of investigators' recruitment performance in multicenter clinical trials: a further step for research transparency

Rafael Dal-Re*, David Moher, Christian Gluud, Shaun Treweek, Jacques Demotes-Mainard, Xavier Carne

*Corresponding author for this work

Research output: Contribution to journalEditorialpeer-review

13 Citations (Scopus)
3 Downloads (Pure)


Many clinical trials are terminated before reaching the sample size needed to test the trials' hypotheses owing to poor recruitment.
Registries, such as ClinicalTrials.gov, provide information on the main features of a multicenter clinical trial (MCT) to the general public.
Site investigators are key to the success of MCTs; however, information on their recruitment performance is not publicly available.
We propose that sponsors should disclose the recruitment targets of all site investigators on ClinicalTrials.gov before a trial starts as well as their final recruitment. Information on issues that could have affected recruitment should also be provided.
This information will be of interest to different stakeholders such as patient organizations, sponsors, and MCT networks.
Disclosing all site investigators' recruitment figures could prompt queries to the sponsor from the scientific community about regional subgroup analyses, to assess if ethnic or standard-of-care differences have an impact on treatment outcomes.
Original languageEnglish
Article numbere1001149
Number of pages4
JournalPLoS Medicine
Issue number12
Publication statusPublished - 27 Dec 2011


  • research ethics committee
  • publication
  • clinicaltrials.gov
  • randomized controlled-trials
  • cancer trials
  • statement
  • registration
  • sample-size
  • journal-editors
  • protocols

Cite this