The implication of anti-Ro60 with or without anti-Ro52 antibody in patients with systemic lupus erythematosus.

OBJECTIVES

Anti-Ro60 and anti-Ro52 autoantibodies are frequently used as diagnostic biomarkers for Sjögren's disease, but their clinical significance in systemic lupus erythematosus (SLE) is not well characterized.

METHODS

Patients fulfilling SLE classification criteria were studied according to their anti-Ro status. We defined Ro positivity (Ro+) as those who have either anti-Ro60 or anti-Ro52 positivity. Patient characteristics and disease outcomes, including High Disease Activity Status (HDAS) defined as an ever attainment of SLEDAI2K ≥10, adjusted mean SLEDAI (AMS), and time-adjusted mean clinical SLEDAI (excluding serologic activities) were compared using linear or logistic regressions. Furthermore, isolated or dual positivity of anti-Ro60 and anti-Ro52 were studied.

RESULTS

Out of 409 patients, 47.2% were Ro+. Ro+ patients were predominantly Asian, had positive dsDNA and hypocomplementemia. They showed a higher likelihood of HDAS (OR 1.65, 95% CI 1.10-2.48, P = 0.015), AMS >4 (OR 1.84, 1.18-2.88, P = 0.007) and more frequent use of glucocorticoids (OR 1.87, 1.16-3.03, P = 0.011) and immunosuppressants (OR 2.0, 1.26-3.17, P = 0.003). Additionally, 24.4% of Ro+ patients experienced sicca symptoms, and hypergammaglobulinemia was significantly more common. Multivariate analysis confirmed that Asian ethnicity, severe flares, AMS, hypocomplementemia, rheumatoid factor, proteinuria, leucopenia and sicca symptoms were significantly linked to Ro positivity.

CONCLUSION

Anti-Ro positivity is associated with higher disease activity and increased treatment needs. Ro positivity correlates with laboratory abnormalities such as hypocomplementemia and leucopenia. These findings highlight the importance of anti-Ro60/Ro52 testing in the clinical evaluation of SLE.