Abstract
This study aimed to investigate the clinical, immunological, and radiologic predictors of response to tumor necrosis factor (TNF)-α antagonist therapy in Chinese rheumatoid arthritis (RA). Ninety RA patients were divided into two groups according to their responsiveness to TNF-α antagonist therapy at 1 month: group A (responders) and group B (non-responders). After 3 months of therapy, all the 90 patients were re-assessed and re-divided into another two groups: group C (responders) and group D (non-responders). Serum samples and clinical characteristics as well as radiographic features were collected at baseline, first month, and third month post-initial administration of TNF-α antagonist. Serum TNF-α, interleukin (IL)-6, IL-8, IL-34, and matrix metalloproteinase (MMP)-3 were measured by enzyme-linked immunosorbent assay (ELISA). Disease activity and Sharp score were evaluated. (1) Comparisons between groups A and B: subjects in group A showed a lower level of erythrocyte sedimentation rate (ESR) and a higher level of albumin (ALB) at baseline than that of group B (p < 0.05). The cutoff value of ALB for prediction was ≥34.9 g/l and that of ESR was ≤55.5 mm/h. (2) Comparisons between groups C and D: group C showed lower levels of ESR, health assessment questionnaire (HAQ), and IL-34 at baseline (p < 0.05). The threshold for prediction were as follows: ESR ≤60 mm/h, HAQ ≤1.3125, and IL-34 ≤194.12 pg/ml. (3) The serum cytokines were positively correlated with C-reactive protein (CRP) and disease activity index, while ALB was negatively correlated with CRP and disease activity. Baseline ALB ≥34.9 g/l or ESR ≤55.5 mm/h might predict a good response at 1-month treatment of TNF-α antagonist, while baseline ESR ≤60 mm/h, HAQ ≤1.3125, and IL-34 ≤194.12 pg/ml might predict a good response at 3-month treatment.
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Acknowledgments
This project was supported by the grants from the Science & Technology Ministry ‘11th and 12th Five-Year Plan’ to support science and technology of China (No.2008BAI59B01 and No.2014BAI07B00).
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Authors’ contributions
Liqi Bi and Rui Ding designed the study, analyzed the data, and wrote and revised the manuscript. Ping Li collected the clinical characteristics. Ding Song and others scored the van der Heijde-modified Sharp score. Rui Ding performed the experiments. Xin Zhang collected and stored the serum samples.
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Ding, R., Li, P., Song, D. et al. Predictors of response to TNF-α antagonist therapy in Chinese rheumatoid arthritis. Clin Rheumatol 34, 1203–1210 (2015). https://doi.org/10.1007/s10067-015-2973-3
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DOI: https://doi.org/10.1007/s10067-015-2973-3