FRI0496 FRECUENCY OF POLYAUTOIMMUNITY IN RHEUMATOID ARTHRITIS AND SYSTEMIC LUPUS ERITHEMATOSUS

Background: Objectives: To study the frequency of polyautoinmunity and multiple autoinmune syndrome (MAS) in patients with rheumatoid arthritis (RA) and systemic lupus erithematosus (SLE). Methods: Study design: We performed a cross-sectional study in patients with RA and SLE, and compared them with healthy subjects. Cases: RA patients classified by ACR/EULAR 2010 criteria and SLE patients classified by ACR/EULAR 2019 criteria. SLE and RA patients were compiled consecutively from a rheumatology clinic of the Regional University hospital of Malaga. Controls: subjects without rheumatologic autoimmune disease (AD) from the same population area. Protocol: All subjects filled out a predesigned questionnaire for the collection of polyautoimmunity data on the cut-off date. Main variables: polyautoimmunity was defined as co-occurrence of SLE or RA and other AD. Secondary variables: Rheumatologic, cutaneous, endocrine, digestive and neurological AD. MAS was defined as presence of three or more AD. Family history of SLE, RA and other autoimmune diseases were also collected. Statistic analysis: descriptive analysis, bivariate analysis and multivariable analysis were done. (Dependent variable: Polyautoimmunity). Results: We recruited 109 patients with RA, 105 with SLE and 88 controls. Fifteen patients with RA (13.8%), 43 with SLE (41%) and 2 controls (2.2%) reported polyautoimmunity. Table 1 describes the epidemiological characteristics, comorbidities and polyautoimmunity in study population. The most frequent AD associated with RA was Sjogren’s syndrome (SS) (53.3%) and SS (55.8%) followed by the antiphospholipid syndrome (30.2%) were associated with SLE. Hashimoto’s thyroiditis and psoriasis were the next most frequent AD. According to family history, 5 patients with RA (33.3%) and 12 with SLE (27.9%) had a family history of first degree of other AD. Obesity was associated with polyautoimmunity in RA (OR = 3,362, p = 0.034). In SLE, joint damage (OR = 2.282, p = 0.038) and anti-RNP antibodies (OR = 5.095, p = 0.028) were factors associated with polyautoimmunity and taking hydroxychloroquine was a protective factor (OR = 0.190, p = 0.004). Conclusion: Polyautoimmunity in RA and especially in SLE is frequent. It was associated with obesity in RA and in SLE with joint damage and anti-RNP antibodies. The hydroxychloroquine appeared as a protective factor. Disclosure of Interests: None declared