Abstract
Objective
To analyze the clinical features and outcomes of the patients with anti-glycyl tRNA synthetase (anti-EJ) syndrome in a large Chinese cohort.
Methods
The medical records, imaging, and serologic data of patients with anti-EJ antibodies from the China-Japan Friendship Hospital database were retrospectively investigated. Anti-EJ antibodies were identified using immunoblot assay. Long-term follow-up was conducted.
Results
Anti-EJ antibodies were present in 46 (19.7%) of the 234 patients with antisynthetase syndrome (ASS), preceded by anti-Jo-1 and anti-PL-7 antibodies. The mean age of disease onset was 51.2 ± 15.9 years, and 69.6% of these patients were female. The most prevalent clinical feature was interstitial lung disease (ILD) (96.7%), which was also the most common initial manifestation, followed by fever (60.9%), mechanic’s hands (56.5%), muscle involvement (50%), and Raynaud phenomenon (8.7%). Ten (21.7%) patients developed rapidly progressive ILD (RP-ILD). Organizing pneumonia (OP) on high-resolution computed tomography (HRCT) scans (OR = 37.5, p = 0.006) and a higher C-reactive protein-to-albumin ratio (CAR) (OR = 28.3, p = 0.01) were independent risk factors for RP-ILD. Muscular pathological features were heterogeneous. Concomitant infection was noted in 63.0% of the patients during the disease course. Hypoalbuminemia (OR = 0.759, p = 0.002) was an independent risk factor for concomitant infection. Patients responded well to glucocorticoid therapy. The 5- and 10-year survival rates of the patients with anti-EJ were 97.8% and 88%, respectively.
Conclusion
Anti-EJ syndrome was found to be a relatively common ASS subtype, with a favorable outcome. A notable proportion of the patients experienced RP-ILD, which was prone to OP on HRCT and a higher CAR, and needed aggressive management.
Key Points • ILD was the most common initial manifestation of anti-glycyl tRNA synthetase syndrome. • RP-ILD was notable in anti-EJ positive patients. • Anti-EJ positive patients possessed a favorable long-term prognosis, but easily relapsed. |
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Acknowledgments
The authors would like to thank Qinlin Peng, Lin Liang, Yamei Zhang, Lifang Ye, Yawen Shen, Hongxia Yang from China-Japan Friendship Hospital, Beijing, China, and Lili Jiang from Jiangxi Provincial People’s hospital, Nanchang, Jiangxi, China for their assistance and advice.
Funding
This study was supported by the National Natural Science Foundation of China (81571603), and Beijing Municipal Science and Technology Commission (Z181100001718063, Z171100001017208).
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Yinli Zhang, Xin Lu and Guochun Wang designed the study; Yinli Zhang and Yongpeng Ge enrolled subjects and collected data; Yinli Zhang, Hanbo Yang and He Chen analyzed the data; Xiaolan Tian and Zhenguo Huang reviewed the CT scans; Yinli Zhang, Shengyun Liu and Guochun Wang discussed the results and wrote the manuscript. All authors reviewed the manuscript.
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Zhang, Y., Ge, Y., Yang, H. et al. Clinical features and outcomes of the patients with anti-glycyl tRNA synthetase syndrome. Clin Rheumatol 39, 2417–2424 (2020). https://doi.org/10.1007/s10067-020-04979-8
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DOI: https://doi.org/10.1007/s10067-020-04979-8