Real-world safety and efficacy of rADAMTS13 in the treatment of congenital thrombotic thrombocytopenic purpura in pediatric patients in Poland

Background: Congenital thrombotic thrombocytopenic purpura (cTTP) is an ultrarare microvascular disease caused by the deficiency of the metalloprotease ADAMTS13 (a disintegrin and metalloprotease with thrombospondin motifs 13). Approximately half of all cases remain undiagnosed until a triggering event in adulthood; therefore, the prevalence rates may be underestimated. The current standard of care is based on regular transfusions of fresh frozen plasma, which often lead to allergic reactions in patients. Recombinant ADAMTS13 (rADAMTS13) is a novel treatment for cTTP, which has been approved for use in the USA, Europe, and Japan.

Objectives: The primary objective of this real-world data collection was to comprehensively analyze the clinical data of pediatric patients with cTTP and to provide real-world evidence of the effectiveness of rADAMTS13 treatment in the pediatric population.

Methods: Nine pediatric patients with cTTP were treated with an intravenous infusion of rADAMTS13 every 2 weeks.

Results: The results showed an increase in platelet count and a decrease in lactate dehydrogenase levels compared with baseline. None of the patients experienced any adverse events or complications as a result of treatment. Patients reported an improved quality of life due to fewer hospital visits and a reduced number of recurrent episodes of cTTP.

Conclusion: Treatment with rADAMTS13 resulted in the normalization of laboratory parameters in all pediatric patients with cTTP.