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Diagnostic value of serum connective tissue growth factor in rheumatoid arthritis

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A Letter to the Editor to this article was published on 15 March 2021

Abstract

Serum connective tissue growth factor (CTGF) is reported to be a potential biomarker for the diagnosis of rheumatoid arthritis (RA). Our study aimed to investigate the prevalence of serum CTGF and the association with the clinical features in RA patients. Serum samples were obtained from 180 patients with RA, 168 patients with other rheumatic diseases, including 43 systemic lupus erythematosus (SLE), 34 osteoarthritis (OA), 17 primary Sjögren’s syndrome (pSS), 20 ankylosing spondylitis (AS), 23 psoriatic arthritis (PsA), 6 reactive arthritis (ReA), 20 systemic sclerosis (SSc), and 5 systemic vasculitis (SV), and 64 healthy individuals. The clinical and laboratory data of patients with RA were collected. Levels of CTGF in serum were measured by enzyme linked immunosorbent assay (ELISA). Associations between CTGF and the clinical features of RA were analyzed. The positivity of serum CTGF among RA patients (33.89%) was significantly higher than those of SLE (9.3%), OA (0%), AS (0%), pSS (0%), PsA (0%), ReA (0%), SSc (5%), SV (0%), and healthy controls (4.69%) (p < 0.0001). The mean concentration of serum CTGF in RA was also significantly higher than those in other rheumatic diseases and healthy controls (p < 0.001). At the cut-off value of 263.30 pg/ml, the sensitivity, specificity, positive predictive value, and negative predictive value of serum CTGF for RA were 33.89%, 96.55%, 88.41%, and 55.45%, respectively. Anti-cyclic citrullinated peptide (anti-CCP) antibody (p < 0.001), rheumatoid factor (RF) (p < 0.001), IgG (p = 0.025), and IgM (p = 0.004) in CTGF-positive patients were higher than those in CTGF-negative patients. Besides, the positive rate of serum CTGF was significantly higher in RA patients with interstitial lung disease (ILD) (53.1%, 26/49) than RA-non-ILD patients (26.7%, 35/131, p = 0.003). Serum CTGF, as a novel biomarker, has certain diagnostic value for RA. Further studies are necessary to get more knowledge for the diagnostic performance of CTGF in RA.

Key points

• Serum CTGF, as a novel biomarker, has certain diagnostic value for RA, the sensitivity, specificity, positive predictive value, and negative predictive value of which were 33.89%, 96.55%, 88.41%, and 55.45%, respectively.

• Serum CTGF was more common to be positive in RA-ILD patients (53.1%, 26/49) than RA-non-ILD patients (26.7%, 35/131, p = 0.003).

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Funding

This work was supported by the National Natural Science Foundation of China (No.81571573).

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Authors and Affiliations

  1. Department of Rheumatology and Immunology, Peking University Third Hospital, Beijing, 100191, China

    Jiaqi Ren, Lin Sun, Zhenzhen Ma, Xinyu Wang, Zhuo An & Jinxia Zhao

  2. Department of Rheumatology and Immunology, Peking University People’s Hospital, Beijing, 100044, China

    Xing Sun

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  1. Jiaqi Ren
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Correspondence to Jinxia Zhao.

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Ren, J., Sun, L., Sun, X. et al. Diagnostic value of serum connective tissue growth factor in rheumatoid arthritis. Clin Rheumatol 40, 2203–2209 (2021). https://doi.org/10.1007/s10067-020-05566-7

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