title: Classification of osteoarthritis biomarkers: a proposed approach.
abstract: OBJECTIVE
  Osteoarthritis (OA) biomarkers are needed by researchers and clinicians to assist in disease diagnosis and assessment of disease severity, risk of onset, and progression. As effective agents for OA are developed and tested in clinical studies, biomarkers that reliably mirror or predict the progression or amelioration of OA will also be needed.
  
  
  METHODS
  The NIH-funded OA Biomarkers Network is a multidisciplinary group interested in the development and validation of OA biomarkers. This review summarizes our efforts to characterize and classify OA biomarkers.
  
  
  RESULTS
  We propose the "BIPED" biomarker classification (which stands for Burden of Disease, Investigative, Prognostic, Efficacy of Intervention and Diagnostic), and offer suggestions on optimal study design and analytic methods for use in OA investigations.
  
  
  CONCLUSIONS
  The BIPED classification provides specific biomarker definitions with the goal of improving our ability to develop and analyze OA biomarkers, and to communicate these advances within a common framework.
authors.affiliation: Department of Medicine, University of California, San Francisco, CA 94107, USA. dbauer@psg.ucsf.edu
authors.forename: D C
authors.initials: DC
authors.lastname: Bauer
authors.forename: D J
authors.initials: DJ
authors.lastname: Hunter
authors.forename: S B
authors.initials: SB
authors.lastname: Abramson
authors.forename: M
authors.initials: M
authors.lastname: Attur
authors.forename: M
authors.initials: M
authors.lastname: Corr
authors.forename: D
authors.initials: D
authors.lastname: Felson
authors.forename: D
authors.initials: D
authors.lastname: Heinegård
authors.forename: J M
authors.initials: JM
authors.lastname: Jordan
authors.forename: T B
authors.initials: TB
authors.lastname: Kepler
authors.forename: N E
authors.initials: NE
authors.lastname: Lane
authors.forename: T
authors.initials: T
authors.lastname: Saxne
authors.forename: B
authors.initials: B
authors.lastname: Tyree
authors.forename: V B
authors.initials: VB
authors.lastname: Kraus
mesh_terms: D001175:Arthrography; D015415:Biomarkers / Q000032:analysis; D018450:Disease Progression; D006801:Humans; D016017:Odds Ratio; D010003:Osteoarthritis / Q000145:classification* / Q000000981:diagnostic imaging / Q000628:therapy; D011379:Prognosis; D012219:Rheumatology; D012307:Risk Factors; D016896:Treatment Outcome
chemical_list: D015415:Biomarkers