Clinical utility of blood neutrophil-lymphocyte ratio in Japanese COPD patients
Open Access
- 2 May 2018
- journal article
- research article
- Published by Springer Science and Business Media LLC in BMC Pulmonary Medicine
- Vol. 18 (1), 1-11
- https://doi.org/10.1186/s12890-018-0639-z
Abstract
Neutrophil-to-lymphocyte ratio (NLR) is a biomarker of inflammation in chronic obstructive pulmonary disease (COPD) patients. But, a meaningful threshold and the longitudinal changes are unknown. We aimed to investigate the association between NLR and the clinical characteristics of COPD patients and to determine a meaningful threshold and the longitudinal changes for NLR. Keio University and its affiliate hospitals conducted an observational COPD cohort study over 3 years. We performed a blood examination and a pulmonary function test. Blood examination was completed at baseline and annually thereafter, at a time when the disease was stable. Two hundred seventy-four patients who had at least 3 blood examinations over 3 years were included. Baseline NLR was correlated with baseline C-reactive protein (CRP) (r = 0.18, p = 0.003) and SAA (r = 0.34, p < 0.001). We defined an NLR score of 2.7 as the arbitrary cut-off value based on upper quartile points. COPD patients with NLR ≥ 2.7 were older (p = 0.037), had a lower BMI (p = 0.005) and a lower %FEV1 (p = 0.0003) compared to patients with NLR < 2.7. Receiver-operating-characteristic (ROC) curves showed the optimal cutoff for the baseline NLR in the predicting moderate/severe exacerbation to be 2.7, which was same as the upper quartile points. Follow-up analysis over 3 years revealed that the differences in the trends of NLR among the three groups based on the categories of exacerbations (moderate or severe, mild, no exacerbation) were significant (p = 0.006). NLR is associated with COPD severity and exacerbations. For predicting exacerbations, we estimated the threshold of NLR to be 2.7 at baseline. Clinical trial registered with the University Hospital Medication Information Network (UMIN000003470, April 10, 2010).Keywords
This publication has 52 references indexed in Scilit:
- Comorbidity, systemic inflammation and outcomes in the ECLIPSE cohortRespiratory Medicine, 2013
- Role of the Neutrophil-Lymphocyte Count Ratio in the Differential Diagnosis between Pulmonary Tuberculosis and Bacterial Community-Acquired PneumoniaAnnals of Laboratory Medicine, 2013
- Global Strategy for the Diagnosis, Management, and Prevention of Chronic Obstructive Pulmonary DiseaseAmerican Journal of Respiratory and Critical Care Medicine, 2013
- Inflammatory Biomarkers Improve Clinical Prediction of Mortality in Chronic Obstructive Pulmonary DiseaseAmerican Journal of Respiratory and Critical Care Medicine, 2012
- Use of risk reclassification with multiple biomarkers improves mortality prediction in acute lung injuryCritical Care Medicine, 2011
- Predictors of Mortality in Elderly Subjects with Obstructive Airway Disease: The PILE ScoreAnnals of Epidemiology, 2010
- Development and first validation of the COPD Assessment TestEuropean Respiratory Journal, 2009
- Association Between Admission Neutrophil to Lymphocyte Ratio and Outcomes in Patients With Acute Coronary SyndromeThe American Journal of Cardiology, 2008
- From COPD to chronic systemic inflammatory syndrome?The Lancet, 2007
- Elevated MMP-12 protein levels in induced sputum from patients with COPDThorax, 2006