Journal List > J Rheum Dis > v.23(2) > 1064309

Kim, Lee, Kim, Park, Park, Kim, Hwang, Choi, and Park: Relationship between Neutrophil-lymphocyte, Platelet-lymphocyte Ratio and Rheumatoid Arthritis Activity

Abstract

Objective

Although previous trials suggested a relationship between neutrophil-lymphocyte ratio (NLR), platelet-lymphocyte ratio (PLR), and systemic inflammatory response, clinical utility of NLR and PLR in rheumatoid arthritis (RA) is not well defined. This study was conducted to assess the efficiency of NLR and PLR as an inflammatory index in patients with RA.

Methods

A total of 107 patients with newly diagnosed RA who had never used steroid and a control group of 50 age- and gender-matched healthy subjects whose high sensitive C-reactive protein (hsCRP) was within normal range were included. Those with cerebrovascular diseases, diabetes, malignancies, or any cardiovascular diseases were excluded from both groups. The patients were divided into two groups according to the Disease Activity Score of 28 joints (DAS28). Group 1 included patients with a DAS28 score of 3.2 and lower (low disease activity) and group 2 included patients with a score higher than 3.2 (moderate to high disease activity).

Results

NLR and PLR in the patient group were 2.99±2.04, 170.90±86.49, significantly higher than that of the control group. NLR and PLR in group 2 were 4.16±2.50, 225.23±93.21, significantly higher than those of group 1 patients (2.26±1.22, 137.15±61.92). NLR and PLR both showed correlation with rheumatoid factor, hsCRP, serum albumin, Korean Heath Assesment Questionnaire, and DAS28.

Conclusion

These data showed a positive correlation between NLR or PLR level and RA disease activity, suggesting that NLR or PLR can be used as an additional inflammatory marker in patients with RA.

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Table 1.
Subjects' characteristics
Characteristic RA patients (n=107) Controls (n=50) p-value
Age (yr) 56.28±11.99 58.60±9.02 0.181
Sex (male) 33 (30.8) 16 (32.0) 0.884
WBC count (×103/μ L) 7,587.85±2,630.90 5,978.00±1,548.18 <0.001
PML (%) 63.34±10.99 52.78±9.46 <0.001
Lymphocyte (%) 26.58±9.60 37.25±9.39 <0.001
NLR 2.99±2.04 1.64±1.10 <0.001
Monocyte 7.42±2.28 6.91±2.03 0.178
Eosinophil 2.11±2.36 2.53±2.14 0.285
Hemoglobin (g/dL) 12.71±1.49 13.84±1.58 <0.001
Platelet count (×103/μ L) 285.35±100.64 234.00±49.42 <0.001
PLR 170.90±86.49 117.01±43.40 <0.001
RF (IU/mL) 143.61±189.00 5.15±4.12 <0.001
hsCRP (mmol/L) 15.94±28.00 0.29±0.23 <0.001
Albumin (g/dL) 4.19±0.38 4.49±0.25 <0.001

Values are presented as mean±standard deviation or number (%). hsCRP: high sensitivity C-reactive protein, NLR: neutrophil-lymphocyte ratio, PLR: platelet-lymphocyte ratio, PML: polymorphonuclear leukocyte, RA: rheumatoid arthritis, RF: rheumatoid factor, WBC: white blood cell.

Table 2.
Subjects' characteristics according to the DAS28
Characteristic Group 1 (DAS28<3.2) Group 2 (DAS28≥3.2) p-value
Age (yr) 57.94±10.57 53.61±13.70 0.088
Duration (mo) 18.20±22.98 8.80±7.82 0.003
Sex (male) 18 (27.3) 15 (36.6) 0.311
RF (IU/ mL) 112.57±165.41 193.58±214.57 0.030
hsCRP (mmol/L) 2.99±4.50 36.78±36.37 <0.001
Albumin (g/dL) 4.29±0.28 4.03±0.45 0.001
Platelet (×103/μ L) 242.16±91.84 354.90±69.26 <0.001
NLR 2.26±1.22 4.16±2.50 <0.001
PLR 137.15±61.92 225.23±93.21 <0.001
KHAQ 1.17±0.48 2.01±0.34 <0.001

Values are presented as mean±standard deviation or number (%). DAS28: Disease Activity Score with 28 joints, hsCRP: high sensitivity C-reactive protein, KHAQ: Korean Health Assessment Questionnaire, NLR: neutrophil-lymphocyte ratio, PLR: platelet-lymphocyte ratio, RF: rheumatoid factor.

Table 3.
Correlation coefficients between clinical parameters and NLR, PLR
Characteristic NLR PLR
r p r p
Age 0.023 0.815 0.001 0.992
Duration −0.116 0.235 −0.185 0.057
RF 0.375 <0.001 0.380 <0.001
hsCRP 0.419 <0.001 0.371 <0.001
Albumin −0.370 <0.001 −0.359 <0.001
NLR Uncalculable Uncalculable 0.751 <0.001
PLR 0.751 <0.001 Uncalculable Uncalculable
KHAQ 0.520 <0.001 0.480 <0.001
DAS28 0.533 <0.001 0.486 <0.001

DAS28: Disease Activity Score with 28 joints, hsCRP: high sensitivity C-reactive protein, KHAQ: Korean Health Assessment Questionnaire, NLR: neutrophil-lymphocyte ratio, PLR: platelet-lymphocyte ratio, RF: rheumatoid factor.

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