title: A novel protein glycan biomarker and future cardiovascular disease events.
abstract: BACKGROUND
  Glycosylated proteins partake in multiple cellular processes including inflammation. We hypothesized that GlycA, a novel biomarker of protein glycan N-acetyl groups, is related to incident cardiovascular disease (CVD), and we compared it with high-sensitivity C-reactive protein (hsCRP).
  
  
  RESULTS
  In 27 491 initially healthy women, baseline GlycA was quantified by nuclear magnetic resonance spectroscopy and hsCRP by an immunoturbidimetric assay. During median follow-up of 17.2 years, 1648 incident CVD events occurred (myocardial infarction, ischemic stroke, coronary revascularization, and CVD death). GlycA and hsCRP were moderately correlated (Spearman r=0.61, P<0.0001). In Cox regression models that included age, ethnicity, smoking, blood pressure, medications, menopausal status, body mass index, and diabetes, hazard ratios for CVD across quartiles 1 to 4 of GlycA were 1.00, 1.10 (95% CI, 0.92 to 1.30), 1.34 (95% CI, 1.13 to 1.58), and 1.64 (95% CI, 1.39 to 1.93), similar to hsCRP, for which hazard ratios were 1.00, 1.18 (95% CI, 0.99 to 1.41), 1.35 (95% CI, 1.14 to 1.61), and 1.75 (95% CI, 1.47 to 2.09) (both Ptrend<0.0001). Associations were attenuated after additionally adjusting for lipids: the hazard ratio of quartile 4 versus 1 for GlycA was 1.23 (95% CI, 1.04 to 1.46; Ptrend=0.002) and for hsCRP was 1.44 (95% CI, 1.20 to 1.72; Ptrend<0.0001). Further adjustment for the other biomarker resulted in a hazard ratio of quartile 4 versus 1 for GlycA of 1.03 (95% CI, 0.85 to 1.24; Ptrend=0.41) and for hsCRP of 1.29 (95% CI, 1.06 to 1.56; Ptrend=0.001).
  
  
  CONCLUSIONS
  In this prospective study of initially healthy women, baseline GlycA was associated with incident CVD, consistent with a possible role for protein glycans in inflammation and CVD.
  
  
  BACKGROUND
  http//clinicaltrials.gov/. Unique identifier NCT00000479.
authors.affiliation: Division of Preventive Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (A.O.A., J.E.B., P.R., S.M.).
authors.forename: Akintunde O
authors.initials: AO
authors.lastname: Akinkuolie
authors.affiliation: Division of Preventive Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (A.O.A., J.E.B., P.R., S.M.).
authors.forename: Julie E
authors.initials: JE
authors.lastname: Buring
authors.affiliation: Division of Preventive Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (A.O.A., J.E.B., P.R., S.M.) Division of Cardiovascular Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (P.R., S.M.).
authors.forename: Paul M
authors.initials: PM
authors.lastname: Ridker
authors.affiliation: Division of Preventive Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (A.O.A., J.E.B., P.R., S.M.) Division of Cardiovascular Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (P.R., S.M.).
authors.forename: Samia
authors.initials: S
authors.lastname: Mora
mesh_terms: D017677:Age Distribution; D000368:Aged; D015415:Biomarkers / Q000097:blood; D002097:C-Reactive Protein / Q000032:analysis*; D002318:Cardiovascular Diseases / Q000097:blood* / Q000453:epidemiology* / Q000503:physiopathology; D016001:Confidence Intervals; D018572:Disease-Free Survival; D004311:Double-Blind Method; D005260:Female; D006031:Glycosylation; D006801:Humans; D015994:Incidence; D053208:Kaplan-Meier Estimate; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008875:Middle Aged; D018579:Patient Selection; D011134:Polysaccharides / Q000097:blood*; D011237:Predictive Value of Tests; D011379:Prognosis; D016016:Proportional Hazards Models; D011446:Prospective Studies; D018570:Risk Assessment; D012720:Severity of Illness Index; D015996:Survival Rate; D016387:Women's Health
chemical_list: D015415:Biomarkers; D011134:Polysaccharides; D002097:C-Reactive Protein
keywords: cardiovascular; epidemiology; glycoproteins; inflammation