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Clinical utility of blood neutrophil-lymphocyte ratio in Japanese COPD patients.

Abstract：

BACKGROUND: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. METHODS: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. RESULTS: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). CONCLUSIONS:NLR is associated with COPD severity and exacerbations. For predicting exacerbations, we estimated the threshold of NLR to be 2.7 at baseline. TRIAL REGISTRATION:Clinical trial registered with the University Hospital Medication Information Network ( UMIN000003470 , April 10, 2010).

journal_name

BMC Pulm Med

journal_title

BMC pulmonary medicine

authors

Sakurai K,Chubachi S,Irie H,Tsutsumi A,Kameyama N,Kamatani T,Koh H,Terashima T,Nakamura H,Asano K,Betsuyaku T

doi

10.1186/s12890-018-0639-z

subject

Has Abstract

pub_date

2018-05-02 00:00:00

pages

issue

issn

1471-2466

pii

10.1186/s12890-018-0639-z

journal_volume

pub_type

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Clinical utility of blood neutrophil-lymphocyte ratio in Japanese COPD patients.