Skip to content


  • Poster presentation
  • Open Access

Are patients and health care professionals influenced by each other's’ opinions about the outcomes to measure in localised prostate cancer effectiveness trials?

  • 1,
  • 1 and
  • 2
Trials201516 (Suppl 2) :P64

  • Published:


  • Prostate Cancer
  • Health Care Professional
  • Stakeholder Group
  • Localise Prostate Cancer
  • Block Randomisation


A core outcome set (COS) is required for effectiveness trials in localised prostate cancer due to outcome heterogeneity. The study aims to develop a COS for localised prostate cancer trials, involving a nested randomised controlled trial (RCT) design within a Delphi survey, to explore and understand how patients and clinicians influence each other's decision-making in the survey.

Methods and design

Two stakeholder groups (patients and clinicians) are included. A three round online Delphi is being used to prioritise a list of outcomes identified in systematic reviews and patient interviews. A methodological sub-study (nested RCT) within the Delphi is also underway. 118 patients and 56 clinicians completed round 1. Participants, stratified by stakeholder group were allocated after round one, using variable block randomisation, to one of three feedback strategies groups. Participants were asked to provide their reasons for changing their scores between rounds.


The outcome of interest for the nested RCT is the difference between elements of the COS developed in each randomised group. The results of the Delphi are expected to be known by October 2015 and will be presented at the ICTMC. If the trial finds no obvious differences between the approaches, it would not be inferred that they are intrinsically the same or that this finding could be applied in other settings (since it could be due to inadequate power or homogeneity of opinion in the studied area); but if important differences are detected, this may have important implications for future development of core outcome sets.

Authors’ Affiliations

University of Aberdeen, Aberdeen, UK
University of Liverpool, Liverpool, UK


© MacLennan et al. 2015

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver ( applies to the data made available in this article, unless otherwise stated.


By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate. Please note that comments may be removed without notice if they are flagged by another user or do not comply with our community guidelines.