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US Food and Drug Administration documents can provide unpublished evidence relevant to systematic reviews.
MedLine Citation:
PMID:  23856190     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
OBJECTIVES: A key systematic review (SR) methodology is comprehensive searching. The Drug Effectiveness Review Project (DERP) SRs search US Food and Drug Administration (FDA) documents to identify unpublished evidence. This study evaluates the success of those efforts.
STUDY DESIGN AND SETTING: We examined DERP reports published since 2003 for the use of FDA preapproval and postmarketing documents. We categorized evidence as (1) unique unpublished studies, (2) supplemental unpublished data, or (3) FDA postmarketing data analysis. Three reviewers independently assigned predetermined impact categories (e.g., qualitative or quantitative usage, fills gaps, confirms findings, and alters conclusions), resolving disagreements through consensus.
RESULTS: Among 114 DERP reports, 19% included unpublished studies and/or supplemental data and 10% included postmarketing analyses. From 175 preapproval documents, 14% provided eligible unpublished studies and 4.0% supplemental unpublished data that helped confirm previous findings, identify important harms, and fill gaps in knowledge about understudied subpopulations, outcomes, and comparisons. Report conclusion statements changed in 9 of 33 instances of premarketing documents compared with 4 of 12 postmarketing analyses.
CONCLUSIONS: The FDA documents can provide important unpublished evidence for SRs, although in a small proportion of cases. Future research should identify attributes that predict which reviews may benefit most from review of FDA documents.
Authors:
Marian S McDonagh; Kim Peterson; Howard Balshem; Mark Helfand
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-7-12
Journal Detail:
Title:  Journal of clinical epidemiology     Volume:  -     ISSN:  1878-5921     ISO Abbreviation:  J Clin Epidemiol     Publication Date:  2013 Jul 
Date Detail:
Created Date:  2013-7-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8801383     Medline TA:  J Clin Epidemiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2013 Elsevier Inc. All rights reserved.
Affiliation:
Department of Medical Informatics & Clinical Epidemiology, and Oregon Evidence-Based Practice Center, Oregon Health & Science University, Portland, OR, USA. Electronic address: mcdonagh@ohsu.edu.
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