AB1201 Diversity in clinical manifestations of autoinflammatory syndromes in a french paediatric rheumatology referral center

Background The autoinflammatory syndromes (AISs) include monogenic and polygenic disorders characterized by primary dysfunction of the innate immune system. Objectives To describe the clinical spectrum, genetic background and therapy in a cohort of AIS patients followed in a reference Pediatric Rheumatology center. Methods Medical records of AIS patients followed until November 2010 and entered in the Eurofever Registry were studied. Results Fifty six patients were included: 17 CAPS, 4 TRAPS, 5 HIDS, 18 FMF, 6 CRMO, 2 SAPHO and 4 Behçet’s Disease (BD). The median follow-up was 2 years (0-14 years). The male/female ratio was 20/36. The median age was 2.5 years at disease onset and 4 years at diagnosis. Family history was positive in 34% of patients. Clinical manifestations included fever (79%), musculoskeletal (77%), gastrointestinal (63%), mucocutaneous (61%), neurological (41%), ocular (34%), cardiorespiratory (13%), and genitourinary (2%) findings, lymphadenopathy with/or hepatosplenomegaly (16%) and growth impairment (25%). The main organ system manifestations were arthralgia (70%), abdominal pain (50%), urticarial rash (34%), headache (34%), conjunctivitis (16%), generalized lymph node enlargement (13%), and chest pain (9%). Complications/sequelae developed in 45% of patients and involved the musculoskeletal (25%), neurological (21%), gastrointestinal (11%) and ocular (7%) systems. Six patients presented with severe/unusual manifestations: neonatal peritonitis (1 CAPS), pancreatitis (1 TRAPS), acute glomerulonephritis (1 FMF), complicated Henoch-Schonlein purpura (1 FMF), peritoneal adhesions with intestinal occlusion (1 FMF), periorbital pain (1 CRMO) and cerebral thrombosis (1 BD). AISs were associated with other diseases in 2 patients (FMF/Hénoch-Schönlein purpura and CRMO/enthesitis-related arthritis). One mutant allele was found in 16/17 CAPS, 4/4 TRAPS and 4/18 FMF patients. Two mutant allelles were present in 5/5 HIDS and 11/18 FMF patients.The most used therapeutic agents were biologics (54%) (anakinra, canakinumab, etanercept, adalimumab), NSAIDs (48%), colchicine (45%) and corticosteroids (29%). Anti-interleukin-1 therapy and colchicine proved efficacy in CAPS and FMF patients, respectively. In addition, favorable responses demonstrated anti-interleukin-1 therapy in TRAPS, HIDS and colchicine-resistant FMF patients, as well as etanercept in TRAPS, HIDS and CRMO patients non-responsive to NSAIDs. Fifty seven% and 41% of patients were in comple