title: The fate of conference abstracts: systematic review and meta-analysis of surgical treatments for men with benign prostatic enlargement.
abstract: OBJECTIVE
  From the literature search for a government-commissioned systematic review on surgical treatments for benign prostatic enlargement (BPE), we identified the relevant conference abstracts of randomised controlled trials (RCTs) which failed to reach full publication and their data were not utilised. We aimed to ascertain, first, the reasons of failure to reach full publication and second, to estimate the impact of including the abstracts' data.
  
  
  METHODS
  A two-part study, consisting of a questionnaire survey and a sensitivity analysis of the above said review.
  
  
  METHODS
  An ad hoc questionnaire was sent to each author of the relevant abstracts, as to determine the reasons of failure to reach full publication. The data from the abstracts were then extracted and incorporated into sensitivity analysis of the review.
  
  
  RESULTS
  Forty-seven questionnaires were completed for 47 abstracts. Of these abstracts, 32 of them were claimed to have reached full publication. A number of reasons of failure to reach full publication were identified, for example: 'being written up' and 'lack of time'. Utilizable, relevant data were obtained from eight of the 47 abstracts, and put into sensitivity analysis. There were small changes in effect sizes and directions for three of 14 reviews' secondary outcomes.
  
  
  CONCLUSIONS
  Common reasons of failure to reach full publication were also identified in the context for the BPE review. Inclusion of abstract data did not affect primary outcome defined in the original review. Identification, summarisation of conference abstracts and other grey literature should form an essential exercise for any systematic review.
authors.affiliation: Urology Research Group, Institute of Cellular Medicine, Newcastle University, Newcastle, UK. u02sww@doctors.net.uk
authors.forename: Susan Siu-Wan
authors.initials: SS
authors.lastname: Wong
authors.forename: Cynthia
authors.initials: C
authors.lastname: Fraser
authors.forename: Tania
authors.initials: T
authors.lastname: Lourenco
authors.forename: Daniel
authors.initials: D
authors.lastname: Barnett
authors.forename: Alison
authors.initials: A
authors.lastname: Avenell
authors.forename: Charis
authors.initials: C
authors.lastname: Glazener
authors.forename: Brian
authors.initials: B
authors.lastname: Cuthbertson
authors.forename: James
authors.initials: J
authors.lastname: N'Dow
mesh_terms: D000043:Abstracting and Indexing / Q000706:statistics & numerical data*; D003226:Congresses as Topic; D006801:Humans; D008297:Male; D011470:Prostatic Hyperplasia / Q000601:surgery*; D011795:Surveys and Questionnaires