5PSQ-175 Cytotoxic T lymphocyte antigen 4 mutations on T reg and abatacept: a paediatric case report
Abstract
Background and importance The lymphoproliferative autoimmune syndrome caused by cytotoxic T lymphocyte antigen 4 (CTLA-4) insufficiency is characterised by immune dysregulation, haploinsufficiency and multiorgan disorders. This condition is classified as a rare disease and no drugs are yet registered for treatment. Abatacept, an antirheumatic agent that prevents T lymphocyte activation, was proposed. Aim and objectives To report the clinical record of a 15-year-old female patient with autoimmune disorders. Material and methods In 2015, the patient showed Gilbert pityriasis rosea with significant and diffused lymphoadenopathy, and levothyroxine was prescribed for her hypothyroidism. In July 2018, the patient had chronic urticaria and angio-oedema with a low antihistamine response. In April 2019, she showed persistent fever, asthenia and splenomegaly, associated with multiple lymphoadenopathies, compatible with a lymphoproliferative autoimmune syndrome.1 Functional tests evidenced a significant reduction in CTLA-4 expression on T reg lymphocytes. In November 2019, omalizumab was started instead of levocetirizine with benefit. In February 2020, clinicians from the paediatric infections unit proposed to the internal pharmaceutical committee the use of intravenous abatacept as off-label chronic treatment to manage autoimmune disorders related to CTLA-4 mutations. As the patient was suffering from a rare disease, the pharmacists suggested compassionate use of the drug, as for the…
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