Exploratory evaluation of pharmacodynamics, pharmacokinetics and safety of rivaroxaban in children and adolescents: an EINSTEIN-Jr phase I study

Download
Author
Kubitza, D; Willmann, S; Becka, M; Thelen, K; Young, G; Brandao, LR; Monagle, P; Male, C; Chan, A; Kennet, G; ...Date
2018-12-04Source Title
Thrombosis JournalPublisher
BMCUniversity of Melbourne Author/s
Monagle, PaulAffiliation
Paediatrics (RCH)Metadata
Show full item recordDocument Type
Journal ArticleCitations
Kubitza, D., Willmann, S., Becka, M., Thelen, K., Young, G., Brandao, L. R., Monagle, P., Male, C., Chan, A., Kennet, G., Martinelli, I., Saracco, P. & Lensing, A. W. A. (2018). Exploratory evaluation of pharmacodynamics, pharmacokinetics and safety of rivaroxaban in children and adolescents: an EINSTEIN-Jr phase I study. THROMBOSIS JOURNAL, 16 (1), https://doi.org/10.1186/s12959-018-0186-0.Access Status
Open AccessAbstract
Background: The EINSTEIN-Jr program will evaluate rivaroxaban for the treatment of venous thromboembolism (VTE) in children, targeting exposures similar to the 20 mg once-daily dose for adults. Methods: This was a multinational, single-dose, open-label, phase I study to describe the pharmacodynamics (PD), pharmacokinetics (PK) and safety of a single bodyweight-adjusted rivaroxaban dose in children aged 0.5-18 years. Children who had completed treatment for a venous thromboembolic event were enrolled into four age groups (0.5-2 years, 2-6 years, 6-12 years and 12-18 years) receiving rivaroxaban doses equivalent to 10 mg or 20 mg (either as a tablet or oral suspension). Blood samples for PK and PD analyses were collected within specified time windows. Results: Fifty-nine children were evaluated. In all age groups, PD parameters (prothrombin time, activated partial thromboplastin time and anti-Factor Xa activity) showed a linear relationship versus rivaroxaban plasma concentrations and were in line with previously acquired adult data, as well as in vitro spiking experiments. The rivaroxaban pediatric physiologically based pharmacokinetic model, used to predict the doses for the individual body weight groups, was confirmed. No episodes of bleeding were reported, and treatment-emergent adverse events occurred in four children and all resolved during the study. Conclusions: Bodyweight-adjusted, single-dose rivaroxaban had predictable PK/PD profiles in children across all age groups from 0.5 to 18 years. The PD assessments based on prothrombin time and activated partial thromboplastin time demonstrated that the anticoagulant effect of rivaroxaban was not affected by developmental hemostasis in children. Trial registration: ClinicalTrials.gov number, NCT01145859.
Export Reference in RIS Format
Endnote
- Click on "Export Reference in RIS Format" and choose "open with... Endnote".
Refworks
- Click on "Export Reference in RIS Format". Login to Refworks, go to References => Import References