NCT05568459Active, not recruiting
A Trial That Evaluates Disease Characteristics in Hemophilia B Adult Male Participants Receiving Prophylaxis With Standard of Care Factor IX Protein (FIX) Replacement Therapy
A Prospective Study to Evaluate Disease Characteristics in Hemophilia B Participants Receiving Prophylaxis With Standard of Care FIX Replacement Therapy
Source: ClinicalTrials.gov · Last updated 7 Aug 2026
Brief summary (registry, in English)
This study is focused on males who have Hemophilia B and who need regular preventive treatment with factor IX protein (FIX) replacement therapy to prevent and also to control their bleeding events. The aim of the study is to gather at least 6 months of information on bleeding events for each individual participant while they continue to use their usual FIX replacement therapy. There is no experimental treatment being tested in this study. The study is informational, and part of a larger program to understand and treat Hemophilia B with a potential experimental new therapy in the future. There is no obligation to agree to taking part in this future study. The study is looking to answer several other research questions to help understand each participant's individual disease characteristics, including: * How often to use FIX replacement therapy, both on a regular basis (prophylaxis) and as needed to treat bleeding events * Measurement of FIX activity (factor IX is a clotting factor) by different laboratories using different types of tests in Hemophilia B participants * Possible complications from the FIX replacement therapy the patient receives (usual standard of care will continue to be used) * How quality of life is affected by Hemophilia B * How joint health is affected by Hemophilia B * How often the participant visits the emergency room, urgent care center, physician's office, hospital, or has a telemedicine visit as a result of bleeding events * Whether the body makes antibodies (a protein produced by the body's immune system) against the FIX replacement therapy you receive, which could make the drug less effective or could lead to side effects
- Status (registry)
- Active, not recruiting
- Study type
- Observational
- Enrollment
- 11 (actual)
- First submitted
- 23 Sept 2022
- Start date
- 17 Jan 2024
- Primary completion date
- 21 Aug 2026
- Lead sponsor
- Regeneron Pharmaceuticals
- Diseases
- Haemophilia
- NCT number
- NCT05568459
What you commit to
- Study type: Observational
- Participants enrolled: 11
- From 17 Jan 2024 to the primary completion date, 21 Aug 2026
- 17 sites in 4 countries
- Visits and tests: ask the trial team, the registry does not list them
Built from the registry fields of ClinicalTrials.gov. It describes the study, not your situation.
Who cannot take part
Copied verbatim from ClinicalTrials.gov and grouped by topic. Only the trial team decides who can take part.
Prior treatment
- Lack of adherence with documentation of bleeds and/or prophylaxis replacement therapy administration in the opinion of the investigator, based on medical history
- Any detectable pre-existing antibodies to the Adeno-associated virus serotype 8 (AAV8) capsid; as measured by an assay at prescreening, as defined in the protocol
- Previously received of any AAV-gene based therapy with a marketed gene therapy or in a clinical trial or intent to receive approved or investigational AAV-gene based therapy during the study period
- NOTE: Other Inclusion/Exclusion Protocol Defined Criteria Apply
Other illness
- History of any coagulation disorder; requires anticoagulant therapy
- Is positive for hepatitis B or C at screening, as defined in protocol
- If any of the following pre-existing diagnoses are documented:
- Cholestatic liver disease
- Liver cirrhosis
- Portal hypertension; or
- Splenomegaly; or
- Hepatic encephalopathy
- History of arterial or venous thrombo-embolic events, as defined in the protocol
- History of clinically significant cardiovascular, respiratory, hepatic, renal (including nephrotic syndrome), gastrointestinal (including protein-losing enteropathy), endocrine, hematological (including thrombophilia), psychiatric, or neurological disease, as assessed by the investigator that may confound the results of the study or poses an additional risk to the participant by study participation
Lab values
- History of FIX inhibitor (clinical or laboratory-based assessment) on 2 or more occasions, as defined in the protocol
- Bethesda inhibitor titer greater than the upper limit of normal (ULN) at screening
Who the study is looking for
- Previous experience with FIX therapy (≥50 documented exposure days to a FIX protein product such as recombinant, plasma-derived or extended half-life FIX product) with a current stable prophylaxis regimen for \>2 months prior to enrollment and intention to use FIX replacement therapy for the duration of the study
- No known hypersensitivity to FIX replacement product
- Willing to be contacted about a potential future clustered regularly interspaced short palindromic repeats (CRISPR)-based Factor 9 (F9) gene insertion clinical trial in which they may have the opportunity to screen for enrollment
Age in the registry: 16 years to - · Sex: Male · Does not accept healthy volunteers
Sites (17)
Sites in registry order. Pick your city on the disease page to sort them by distance.
| Site | City | Country | Site status |
|---|---|---|---|
| McMaster University Medical Centre, Hamilton Health Sciences Coordinator of this site? Confirm its status | Hamilton | Canada | Unknown status |
| Mcgill University Health Center (MUHC) Coordinator of this site? Confirm its status | Montreal | Canada | Unknown status |
| Klinikum der Johann Wolfgang Goethe-Universitaet Frankfurt Coordinator of this site? Confirm its status | Frankfurt | Germany | Unknown status |
| University hospital Hamburg Eppendorf Coordinator of this site? Confirm its status | Hamburg | Germany | Unknown status |
| University Hospital of Regensburg Coordinator of this site? Confirm its status | Regensburg | Germany | Unknown status |
| St Thomas Hospital Coordinator of this site? Confirm its status | London | United Kingdom | Unknown status |
| Barts Health NHS Trust, Royal London Hospital Coordinator of this site? Confirm its status | London | United Kingdom | Unknown status |
| Southampton General Hospital Coordinator of this site? Confirm its status | Southampton | United Kingdom | Unknown status |
| University of Michigan Coordinator of this site? Confirm its status | Ann Arbor | United States | Unknown status |
| University of Colorado Hemophilia and Thrombosis Center Coordinator of this site? Confirm its status | Aurora | United States | Unknown status |
| Rush University Medical Center Coordinator of this site? Confirm its status | Chicago | United States | Unknown status |
| Nationwide Children's Hospital Coordinator of this site? Confirm its status | Columbus | United States | Unknown status |
| University of Florida Coordinator of this site? Confirm its status | Gainesville | United States | Unknown status |
| University of Texas Health Science Center at Houston Coordinator of this site? Confirm its status | Houston | United States | Unknown status |
| Indiana Hemophilia and Thrombosis Center Coordinator of this site? Confirm its status | Indianapolis | United States | Unknown status |
| Yale HTC Coordinator of this site? Confirm its status | New Haven | United States | Unknown status |
| Georgetown University Medical Center Coordinator of this site? Confirm its status | Washington D.C. | United States | Unknown status |
This page is information, not medical advice. Discuss any trial with your doctor.