title: Deficiencies in the transfer and availability of clinical trials evidence: a review of existing systems and standards.
abstract: BACKGROUND
  Decisions concerning drug safety and efficacy are generally based on pivotal evidence provided by clinical trials. Unfortunately, finding the relevant clinical trials is difficult and their results are only available in text-based reports. Systematic reviews aim to provide a comprehensive overview of the evidence in a specific area, but may not provide the data required for decision making.
  
  
  METHODS
  We review and analyze the existing information systems and standards for aggregate level clinical trials information from the perspective of systematic review and evidence-based decision making.
  
  
  RESULTS
  The technology currently used has major shortcomings, which cause deficiencies in the transfer, traceability and availability of clinical trials information. Specifically, data available to decision makers is insufficiently structured, and consequently the decisions cannot be properly traced back to the underlying evidence. Regulatory submission, trial publication, trial registration, and systematic review produce unstructured datasets that are insufficient for supporting evidence-based decision making.
  
  
  CONCLUSIONS
  The current situation is a hindrance to policy decision makers as it prevents fully transparent decision making and the development of more advanced decision support systems. Addressing the identified deficiencies would enable more efficient, informed, and transparent evidence-based medical decision making.
authors.affiliation: Department of Epidemiology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands. g.h.m.van.valkenhoef@rug.nl
authors.forename: Gert van
authors.initials: Gv
authors.lastname: Valkenhoef
authors.forename: Tommi
authors.initials: T
authors.lastname: Tervonen
authors.forename: Bert de
authors.initials: Bd
authors.lastname: Brock
authors.forename: Hans
authors.initials: H
authors.lastname: Hillege
mesh_terms: D002986:Clinical Trials as Topic; D062313:Databases, Pharmaceutical; D003657:Decision Making; D019317:Evidence-Based Medicine; D006801:Humans; D033181:Information Dissemination; D011050:Policy Making; D012042:Registries