Frequency of ANA/DFS70 in relatives of patients with rheumatoid arthritis compared to patients with rheumatoid arthritis and a healthy population, and its association with health status

Abstract

IntroductionDFS70 ANAs have attracted interest due to their frequency in individuals with no clinical evidence of systemic autoimmune rheumatic disease (SARD), groups with genetic risk for rheumatoid arthritis (RA) were not assessed. ObjectiveTo determine the frequency of ANA and DFS70 ANA in blood relatives (BR) of people with RA compared to patients with early RA (ERA), and control individuals, and its association with health status. MethodologyA cross-sectional study with an analytical component. Sixty ERA patients, 60 BR and 120 control individuals paired by age and sex were studied. Hep2-ANA and DFS70 ANA were studied. The absolute and relative frequencies and associations were established using logistic regression models, with a significance level of 95% Results43% ANA in ERA, 30% in BR, and 25%-8% in control individuals 1:80. The fine dense granular pattern based on conventional Hep2 was found in 12%-9% of the positive samples, and 1.66% of the total samples. There was no detection of DFS70 ANAs in patients with ERA. In ERA there was an association between the presence of ANA and inflamed joints (P = .02), CRP (P = .01), DAS28CRP (P = .03) and HAQ (P = .04). There was an association between ANA and elevated CRP (P = .05) in the BR. In the control individuals, there was an association between ANA and painful joints (P = .02). In DFS70 ANA individuals we observed an association between a normal ESR P = .032, BR (-), P = .044 and absence of painful joints, p = .039 ConclusionsThe frequency of DFS70 ANA in the groups studied was low, none of the patients with ERA was positive. The presence of DFS70 ANA was only confirmed in systemically healthy individuals.