The objectives of this study are to analyze the association between anti-
nuclear matrix protein 2 (NXP2)
autoantibody and
idiopathic inflammatory myopathies (IIMs) and to assess the diagnostic and prognostic relevance of anti-NXP2
autoantibody in patients with IIMs. A systematic search was performed in PubMed, Web of Science, EMBASE, the Cochrane Library, and Scopus to identify studies published as of February 29, 2020. Data was analyzed using Stata 12.0 and Meta-DiSc 1.4. Twenty-eight studies (4764 patients with IIMs and 1981 controls) were included in the meta-analysis. Anti-NXP2
autoantibody showed a significant association with IIMs (odds ratio (OR) = 26.36, 95% confidence interval (CI): 12.05-57.67, P < 0.001), especially juvenile IIMs (OR = 62.48, 95% CI: 16.97-229.98, P < 0.001). The pooled sensitivity, specificity, and area under the curve were 0.19 (95% CI = 0.16-0.21), 1.00 (95% CI = 1.00-1.00), and 0.95 for patients with juvenile IIMs versus controls. Anti-NXP2
autoantibody was associated with an increased risk of developing five characteristics (
edema,
muscle weakness,
myalgia/myodynia,
dysphagia, and
calcinosis) and reduced risk of
interstitial lung disease (ILD) (P < 0.001). Anti-NXP2
autoantibody showed no association with increased risk of death in IIMs (P = 0.463). These findings suggest that anti-NXP2
autoantibody is specially related to IIMs and is related to
edema,
muscle weakness,
myalgia/myodynia,
dysphagia,
calcinosis, and ILD in patients with IIMs. However, there is no evidence to suggest that the presence of anti-NXP2
autoantibody confers a poor prognosis with respect to overall survival. Key Points • This study summarized the diagnostic and prognostic accuracies of anti-NXP2
autoantibody for patients with IIMs. Anti-NXP2
autoantibody is related to
edema,
muscle weakness,
myalgia/myodynia,
dysphagia,
calcinosis, and ILD in patients with IIMs.