P60 Rituximab use within the Scottish paediatric and adolescent rheumatology network: a review of five years' experience.

Background Rituximab is an anti-CD20 chimeric monoclonal antibody that depletes pre-plasma B cells. It is used in paediatric rheumatology for conditions including juvenile systemic lupus erythematosus (jSLE), juvenile dermatomyositis (JDM), vasculitides and refractory juvenile idiopathic arthritis (JIA). We aim to describe the cohort of patients treated with rituximab in the Scottish Paediatric and Adolescent Rheumatology Network (SPARN) in a 5-year period, and assess the need for a network guideline. Methods A review of paper and electronic case records. Patients seen within the SPARN network who received Rituximab between 2014 and 2018 were included. Results Vasculitis Rituximab was given to 16 patients in 5 different SPARN centres between 2014 and 2018. Male: Female ratio was 1:4.3. Mean age at first dose of rituximab was 12.75 years. Mean disease duration pre rituximab was 1 year. 8 (50%) patients had jSLE, 7 multisystem and 1 isolated lupus nephritis. 3 had ANCA-positive vasculitis and 5 had other conditions. (1 had RF+ve JIA; 1 severe panuveitis; 1 had an unspecified autoinflammatory condition; 1 had COPA syndrome with severe interstitial lung disease and 1 had autoimmune polyendocrinopathy-candidiasis-ectodermal dystrophy (APECED). Documentation of pre-rituximab checks was poor. Baseline bloods were done in all 16 patients. 11 patients had lymphocyte subsets and 13 immunoglobulins documented. Disease-specific antibodies were measured in all patients in whom applicable (11). 11 had a chest x-ray prior to rituximab. In 9 cases a pre-rituximab pregnancy test was indicated: none were documented. In only 3 patients was a pre-rituximab history of recent infections documented. In 8 patients a discussion regarding treatment risks and benefits was documented. Post-infusion lymphocyte subset monitoring was variable but documented in 15. 1 patient was never B cell deplete. 9 never fully reconstituted. RTX dose information was available for 14. All received doses of 750mg/m2 with 6 having the dose capped at 1g. Dose frequency information was available for all. The majority (9) received 2 doses. Of the rest, 1 patient received a single dose. 3 received 3 doses, 2 had 4 and 1 had 5. All patients in whom information was available, received pre-medication with paracetamol, chlorphenamine and methylprednisolone (n = 14). 4 patients had side effects noted (rash/itch in 1, anaphylaxis in 1, facial flushing in 1 and post-infusion infection in 1). Clinical response was clearly documented in 8 patients, 7 of whom showed clinical improvement (2 had systemic jSLE, 2 had ANCA +ve vasculitis, 1 had isolated lupus nephritis, 1 had COPA syndrome and 1 had RF+ JIA). Conclusion Rituximab is used for a range of conditions and in a number of centres within SPARN. This review highlights variation in and poor documentation of pre-rituximab discussions and investigations, prescribing, monitoring and response. A SPARN rituximab protocol is being developed to address this. Conflicts of Interest The authors declare no conflicts of interest. [ABSTRACT FROM AUTHOR]