RT Conference Proceedings T1 Analysis of the state of immunity in patients with jia in treatment A1 Aranda-Valera, Inmaculada Concepcion A1 Pineda-Lourdes, Ladehesa A1 Ugalde-Pilar, Font A1 Lechuga-Elena, Fernandez de la Puebla A1 Marin-Sara, Copete A1 Collantes-Estevez, Eduardo A1 Molina-Rosa, Roldan K1 Arthritis, Juvenile K1 Cross-Sectional Studies K1 Rheumatology K1 Antirheumatic Agents K1 Flow Cytometry AB The correct indication for suspending treatment with DMARDs (FAMES) and biological therapy in pediatric patients with mild infectious diseases or during vaccination is a common dilemma in pediatric rheumatology. In patients with juvenile idiopathic arthritis (JIA), clinical reactivations—both joint and extra-articular—are frequently observed during these treatment “pauses,” yet there is a lack of sufficient studies in the pediatric population to clarify the impact of these treatments on the immune system and thus justify this clinical approach. The objective of this study was to analyze the levels of T, B, and NK lymphocyte subpopulations in JIA patients treated with DMARDs and biological therapy. A descriptive, cross-sectional study was conducted involving 39 patients from the Pediatric Rheumatology Unit of the Reina Sofía University Hospital, all diagnosed with JIA according to the ILAR 2001 criteria. Patients were categorized into four groups: 8 in clinical remission without treatment, 17 receiving DMARD monotherapy, 7 on biological monotherapy, and 7 receiving combination DMARD-biological therapy. Patients with systemic JIA were excluded due to their distinct pathogenic mechanisms. Immune profiling was performed by flow cytometry to measure CD3, CD4, CD8, and CD19 cell levels (acquired immunity), NK cells (innate immunity), and the CD4/CD8 index. PB BMJ publishing group SN 0003-4967 YR 2022 FD 2022-05-11 LK https://hdl.handle.net/10668/25904 UL https://hdl.handle.net/10668/25904 LA en NO Aranda-Valera IC, Lourdes LP, Pilar FU, De la Puebla Lechuga Elena F, Sara CM, Estevez EC, et al. AB0933 ANALYSIS OF THE STATE OF IMMUNITY IN PATIENTS WITH JIA IN TREATMENT. Annals Of The Rheumatic Diseases [Internet]. 1 de junio de 2019;1932.3-1933 DS RISalud RD Sep 21, 2025