Persistent Systemic Inflammation is Associated with Poor Clinical Outcomes in COPD: A Novel Phenotype

A. Agusti, L.D. Edwards, S.I. Rennard, W. MacNee, R. Tal Singer, B.E. Miller, J. Vestbo, D.A. Lomas, P.M. Calverley, E.F.M. Wouters, C. Crim, J.C. Yates, E.K. Silverman, H.O. Coxson, P. Bakke, R.J. Mayer, B. Celli, the ECLIPSE Investigators

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

BACKGROUND: Because chronic obstructive pulmonary disease (COPD) is a heterogeneous condition, the identification of specific clinical phenotypes is key to developing more effective therapies. To explore if the persistence of systemic inflammation is associated with poor clinical outcomes in COPD we assessed patients recruited to the well-characterized ECLIPSE cohort (NCT00292552). METHODS AND FINDINGS: Six inflammatory biomarkers in peripheral blood (white blood cells (WBC) count and CRP, IL-6, IL-8, fibrinogen and TNF-alpha levels) were quantified in 1,755 COPD patients, 297 smokers with normal spirometry and 202 non-smoker controls that were followed-up for three years. We found that, at baseline, 30% of COPD patients did not show evidence of systemic inflammation whereas 16% had persistent systemic inflammation. Even though pulmonary abnormalities were similar in these two groups, persistently inflamed patients during follow-up had significantly increased all-cause mortality (13% vs. 2%, p<0.001) and exacerbation frequency (1.5 (1.5) vs. 0.9 (1.1) per year, p<0.001) compared to non-inflamed ones. As a descriptive study our results show associations but do not prove causality. Besides this, the inflammatory response is complex and we studied only a limited panel of biomarkers, albeit they are those investigated by the majority of previous studies and are often and easily measured in clinical practice. CONCLUSIONS: Overall, these results identify a novel systemic inflammatory COPD phenotype that may be the target of specific research and treatment.
Original languageEnglish
Article numbere37483
Number of pages10
JournalPLOS ONE
Volume7
Issue number5
DOIs
Publication statusPublished - 18 May 2012

Keywords

  • OBSTRUCTIVE PULMONARY-DISEASE
  • CARDIOVASCULAR-DISEASE
  • GLOBAL BURDEN
  • BIOMARKERS
  • FUTURE
  • PREVALENCE
  • ECLIPSE
  • MARKERS
  • POINTS
  • COHORT

Cite this

Agusti, A., Edwards, L. D., Rennard, S. I., MacNee, W., Tal Singer, R., Miller, B. E., Vestbo, J., Lomas, D. A., Calverley, P. M., Wouters, E. F. M., Crim, C., Yates, J. C., Silverman, E. K., Coxson, H. O., Bakke, P., Mayer, R. J., Celli, B., & ECLIPSE Investigators, T. (2012). Persistent Systemic Inflammation is Associated with Poor Clinical Outcomes in COPD: A Novel Phenotype. PLOS ONE, 7(5), [e37483]. https://doi.org/10.1371/journal.pone.0037483