First modern Russian plasma-derived coagulation factor VIII concentrate (Eytoplasm): Results of clinical study of pharmacokinetics, efficacy and safety

Introduction . Replacement therapy with coagulation factor VIII concentrates remains the standard of care for patients with hemophilia A. In 2023, the drug Eytoplasm, the first modern plasma-derived coagulation factor VIII concentrate developed in the Russian Federation, was authorized for medical use in the Russian Federation. Aim : to study the efficacy, safety, immunogenicity, and pharmacokinetic properties of Eytoplasm. Methods . A multicenter, prospective, open-label clinical trial was conducted in 55 patients over 12 years of age with severe hemophilia A who had previously received treatment with coagulation factor VIII concentrates (at least 150 exposure days). All patients received the drug for prophylactic treatment 2–3 times a week; the treatment duration was 6 months (at least 50 exposure days). In addition, the drug was used to treat bleeding. Ten patients underwent 10 surgical interventions (2 major and 8 minor). Pharmacokinetic parameters were determined after the first administration of the drug to patients and after 6 months of therapy. Results . Eytoplasm pharmacokinetics properties are comparable with other plasma-derived coagulation factor VIII concentrates. No bleeding was recorded in 75.9% of patients. In 92.3 % of patients, a single administration of the drug was sufficient to stop an episode of bleeding. In all participants who completed the study, the residual activity of coagulation factor VIII 48–72 hours after drug administration was at least 1 %. Positive dynamics of APTT was showed during the study. Serious adverse events, allergic reactions, thrombotic and thromboembolic complications were absent in patients. In 3 patients, 4 adverse events associated with the use of the drug were registered: 2 cases of increased serum concentration of direct bilirubin and 2 cases of headache. An inhibitor to coagulation factor VIII was not detected in any patient. In none of the patients who did not have antibodies to parvovirus B19 before the first dose of Eytoplasm, antibodies were detected after 6 months of therapy. Conclusion . Eytoplasm is an effective option for the prevention and treatment of bleeding, and during surgical interventions, including major ones, in patients with hemophilia A. The drug has a favorable safety profi le; its use was not associated with the formation of inhibitory antibodies, allergic reactions, thrombotic and thromboembolic complications.