Abstract:Objectives To detect salivary macrophage migration inhibitory factor (MIF) level in patients with primary Sjögren′s syndrome (pSS) and investigate the correlation between MIF level and disease activity. Methods The pSS patients diagnosed in Beijing University of Chinese Medicine Third Affiliated Hospital (hereinafter referred to as "our hospital") from October 2009 to October 2018 were enrolled as pSS group (96 cases); the other age- and sex- matched healthy people were included as control group (70 people) during the same period of our hospital. The disease activity of patients with pSS were evaluated, and the salivary MIF level of each group were compared. The relationship between salivary MIF level and the incidence of pSS was evaluated, while the correlation between saliva MIF levels and EULAR Sjogren′s syndrome disease activity index (ESSDAI) were analyzed. Results The salivary MIF level in the pSS group was significantly higher than that in the control group, and the differences were highly statistically significant (P < 0.01). Salivary MIF level was the independent risk factors for pSS [OR(95%CI)=1.996(1.339-2.977),P < 0.01]. Salivary MIF level was positively correlated with ESSDAI (r = 0.276,P < 0.01). Conclusion Salivary MIF level is expected to be an important biomarkers for predicting the development of pSS.
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