- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT04590950
Dosage and PD Study of Eftrenonacog-alfa (BIOPAL)
Monitoring and Pharmacodynamics Effect of Recombinant Factor IX Fc in Severe Haemophilia B Patients: a Real-life Study
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
A recent European survey showed that increasing number of hemophilia B patients was switched from standard to extended half-life drugs. While some clinicians currently prefer to treat empirically rather than based on laboratory results, adoption of replacement therapy based on extended half-life products such as eftrenonacog-alfa may increase the interest in individualized pharmacokinetic assessments allowing the development of an initial dosing regimen. Thus inaccurate FIX activity measurements might be critical, especially when FIX trough level is used to tailor patient dosing regimens. It is therefore important that FIX activity levels are accurately determined allowing adequate recovery without increasing the cost of medical management of hemophilia B patients due to unnecessary dose corrections.
With the expansion of the prescription of eftrenonacog-alfa, the problem of accurately measuring its recovery has risen within hemostasis laboratories. Chronometric one-stage assays (OSA) are currently the most widely performed tests for FIX activity measurement. They are based on activated partial thromboplastin time (aPTT) reagent and factor-deficient plasma. Various aPTT reagents are commercialized. They could lead to a substantial variability in FIX results. Chromogenic two-stage assays (CSA) are less frequently used in clinical laboratories. They present fewer reagent choice compared to OSA. Several studies have evaluated OSA and CSA performances in samples spiked with eftrenonacog-alfa and have evidenced that some commonly used aPTT reagents would not be suitable for accurately monitoring this product. Whether these results are commutable to post-infusion samples collected from real-life patients remains unclear.
Unlike the measurement of a unique coagulation factor activity, thrombin generation assay (TGA) is a dynamic global test that explores the coagulation cascade as well as the anticoagulant pathways. TGA could be therefore a valuable tool to monitor replacement therapy in hemophilia B patients.
Hence the investigators sought in a real-life setting to compare 2 CSA and 1 OSA reagents to a product specific OSA in severe hemophilia B patients supplemented with eftrenonacog-alfa. The investigators also aimed to evaluate the pharmacodynamics (PD) of eftrenonacog-alfa using TGA.
Study Type
Enrollment (Anticipated)
Contacts and Locations
Study Contact
- Name: Georges JOURDI, PharmD, PhD
- Phone Number: 00 33 1 58 41 20 05
- Email: georges.jourdi@aphp.fr
Study Locations
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-
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Paris, France, 75014
- Service d'hématologie biologique - Hôpital Cochin
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Sampling Method
Study Population
Description
Inclusion Criteria:
- severe haemophilia B patients
- treated with eftrenonacog-alfa
Exclusion Criteria:
- any other haemostatic or replacement therapy
Study Plan
How is the study designed?
Design Details
Cohorts and Interventions
Group / Cohort |
Intervention / Treatment |
---|---|
Single-group study
Severe haemophilia B patients substituted with eftrenonacog-alfa
|
Non interventional study
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
FIX activity levels
Time Frame: One month
|
2 chromogenic assays (Bio phen FIX and Rox FIX) and 2 chronometric assays (CK Prest with standard human plasma or FIX deficient plasma supplemented with eftrenonacog-alfa as calibrators)
|
One month
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Thrombin generation assay
Time Frame: One month
|
Thrombin generation assay is performed using a microplate fluorometer. Plasma samples are run using 20 μL low phospholipids reagent (PPP-reagent) (1 μM tissue factor and 4 micromoles (μM )phospholipid vesicles) or 20 μL Thrombin Calibrator. Assay is initiated by auto dispensing 20 μL of Fluo-Substrate solution containing calcium ions and fluorogenic substrate, Z-Gly-Gly-Arg-7-amino-4-methylcoumarin. Generated thrombin cleaves the substrate and fluorescence increase is monitored at 37 °C for 60 min with a measurement every 20 seconds. Thrombin scope®, version 5.0.0.742 is used to calculate the amount of thrombin generated over time taking into account for each sample the calibrator activity. Consequently, five parameters are reported by the Thrombin scope® the fist is lag time (LT; in min) |
One month
|
Thrombin generation assay
Time Frame: One month
|
microplate fluorometer, time to peak
|
One month
|
Thrombin generation assay
Time Frame: One month
|
microplate fluorometer, peak height
|
One month
|
Thrombin generation assay
Time Frame: One month
|
microplate fluorometer, endogenous thrombin potential
|
One month
|
Thrombin generation assay
Time Frame: One month
|
microplate fluorometer, velocity
|
One month
|
Collaborators and Investigators
Publications and helpful links
General Publications
- Srivastava A, Brewer AK, Mauser-Bunschoten EP, Key NS, Kitchen S, Llinas A, Ludlam CA, Mahlangu JN, Mulder K, Poon MC, Street A; Treatment Guidelines Working Group on Behalf of The World Federation Of Hemophilia. Guidelines for the management of hemophilia. Haemophilia. 2013 Jan;19(1):e1-47. doi: 10.1111/j.1365-2516.2012.02909.x. Epub 2012 Jul 6.
- Peyvandi F, Garagiola I, Boscarino M, Ryan A, Hermans C, Makris M. Real-life experience in switching to new extended half-life products at European haemophilia centres. Haemophilia. 2019 Nov;25(6):946-952. doi: 10.1111/hae.13834. Epub 2019 Aug 16.
- Sommer JM, Buyue Y, Bardan S, Peters RT, Jiang H, Kamphaus GD, Gray E, Pierce GF. Comparative field study: impact of laboratory assay variability on the assessment of recombinant factor IX Fc fusion protein (rFIXFc) activity. Thromb Haemost. 2014 Nov;112(5):932-40. doi: 10.1160/TH13-11-0971. Epub 2014 Aug 21.
- Kitchen S, Tiefenbacher S, Gosselin R. Factor Activity Assays for Monitoring Extended Half-Life FVIII and Factor IX Replacement Therapies. Semin Thromb Hemost. 2017 Apr;43(3):331-337. doi: 10.1055/s-0037-1598058. Epub 2017 Mar 6.
- Dargaud Y, Beguin S, Lienhart A, Al Dieri R, Trzeciak C, Bordet JC, Hemker HC, Negrier C. Evaluation of thrombin generating capacity in plasma from patients with haemophilia A and B. Thromb Haemost. 2005 Mar;93(3):475-80. doi: 10.1160/TH04-10-0706.
- Bowyer AE, Shepherd MF, Kitchen S, Maclean RM, Makris M. Measurement of extended half-life recombinant factor IX products in clinical practice. Int J Lab Hematol. 2019 Apr;41(2):e46-e49. doi: 10.1111/ijlh.12953. Epub 2018 Dec 7. No abstract available.
- Collins PW, Fischer K, Morfini M, Blanchette VS, Bjorkman S; International Prophylaxis Study Group Pharmacokinetics Expert Working Group. Implications of coagulation factor VIII and IX pharmacokinetics in the prophylactic treatment of haemophilia. Haemophilia. 2011 Jan;17(1):2-10. doi: 10.1111/j.1365-2516.2010.02370.x. Epub 2010 Aug 22.
Study record dates
Study Major Dates
Study Start (Anticipated)
Primary Completion (Anticipated)
Study Completion (Anticipated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- APHP191124
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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