Testing CSL222 (AAV5-hFIXco-Padua) for hemophilia b
Official title: Efficacy and Safety of CSL222 (Etranacogene Dezaparvovec) Gene Therapy in Adults With Hemophilia B With Pretreatment Adeno-associated Virus Serotype 5 (AAV5) Neutralizing Antibodies (Nabs)
Phase 3b, Open-label, Multicenter, Single-dose Study Investigating Efficacy and Safety of CSL222 (Etranacogene Dezaparvovec) Gene Therapy Administered to Adult Subjects With Severe or Moderately Severe Hemophilia B With Detectable Pretreatment AAV5 Neutralizing Antibodies
- Phase 3
- 1 group
- One site, in Hamilton
- Recruiting
Interventions
- Genetic therapy
CSL222 (AAV5-hFIXco-Padua)
Administered as a single IV infusion.
Canadian Sites (1)
1 of 1 recruiting
- Recruiting
McMaster University - Hamilton
Hamilton, Ontario
Eligibility Criteria
See who this study is looking for24 criteria
The trial’s own eligibility text, word for word from the registry. Only the trial site can say who takes part.
Inclusion
- +Considered legally an adult, as defined by country regulations.
- +Has congenital hemophilia B with known severe or moderately severe FIX deficiency (less than or equal to \[\<=\] 2% of normal circulating FIX) for which the participant is on continuous routine FIX prophylaxis.
- +Has 2 consecutive detectable AAV5 NAb titer results between ScreeningScreeningThe checks done before joining, to see whether a study fits.Read more → and Visit L-Final using a validated AAV5 NAb assay (based on central laboratory results).
- +Has greater than (\>) 150 previous exposure days to FIX replacement therapy.
- +Has been on stable FIX prophylaxis for at least 2 months before Screening.
- +Has demonstrated capability to independently, accurately, and in a timely manner complete the eDiary during the Lead-in PeriodRun-in periodA short trial period before the study proper begins.Read more →, as judged by the investigatorPrincipal investigatorThe doctor or researcher responsible for running the study at a site.Read more →.
- +Able to provide informed consentInformed consentThe process of being told what taking part involves, then choosing freely.Read more → after receipt of verbal and written information about the study.
- +Investigator believes that the participant (or the participant's legally acceptable representative\[s\]) understands the nature, scope, and possible consequences of the study and is able to adhere to the study procedures.
- +Acceptance to adhere to contraception guidelines.
Exclusion
- −Known history of allergy to corticosteroids or known medical condition that would require chronic administration of oral corticosteroids.
- −Known uncontrolled allergic conditions or allergy / hypersensitivity to any component of the CSL222 excipients (ie, sucrose, potassium chloride, potassium dihydrogen phosphate, sodium chloride, and disodium hydrogen phosphate).
- −Any uncontrolled or untreated infection (human immunodeficiency virus \[HIV\], hepatitis B virus \[HBV\] and hepatitis C virus \[HCV\], or any other significant concurrent, uncontrolled medical condition including, but not limited to, renal, hepatic, cardiovascular, hematological, gastrointestinal, endocrine, pulmonary, neurological, cerebral or psychiatric disease, alcoholism, drug dependency, or any other psychological disorder evaluated by the investigatorPrincipal investigatorThe doctor or researcher responsible for running the study at a site.Read more → to interfere with adherence to the clinical study protocolProtocolThe detailed plan a study must follow.Read more → procedures or with the degree of tolerance to CSL222.
- −History of FIX inhibitors or positive FIX inhibitor test at Prescreening, ScreeningScreeningThe checks done before joining, to see whether a study fits.Read more → or Visit L-Final (based on central laboratory results).
- −Screening or Visit L-Final laboratory values (based on central laboratory results) of total bilirubin \> 2 × the upper limit of normal (ULN) (except if caused by Gilbert's syndrome).
- −Screening or Visit L-Final laboratory values (based on central laboratory results) of any of the following laboratory abnormalities:
- −ALT \> 2 × the ULN
- −AST \> 2 × the ULN
- −Alkaline phosphatase \> 2 × the ULN
- −Serum creatinine \> 2 × the ULN
- −Hemoglobin less than (\<) 8 g/dL
- −Any condition other than hemophilia B resulting in an increased bleeding tendency.
- −Thrombocytopenia, defined as a platelet count \<50 × 10\^9/L, at Screening or Visit L Final (based on central laboratory results).
- −Previous AAV5 gene therapy treatment.
- −Receipt of an experimental agent or device within 60 days before Screening until the end of the study.
In plain language
Assembled directly from this trial’s registry record. Every sentence traces to a field below — nothing here is generated or interpreted.
What this study is
This study is testing a treatment for a condition.
Phase 3Phase 3A large study comparing a treatment against the current standard.Read more → — a large study comparing this against the current standard, usually across many hospitals.
From the trial registry
Built from these fields:
- designModule.designInfo.primaryPurpose
- designModule.phases
Who receives what
Everyone in this study is in one group and receives CSL222 (AAV5-hFIXco-Padua).
From the trial registry
Built from these fields:
- armsInterventionsModule.armGroups[].label
- armsInterventionsModule.armGroups[].type
- armsInterventionsModule.armGroups[].interventionNames
How the study is run
There is only one group in this study, so there is no assignment to different treatments.
This study is open-labelOpen-labelEveryone knows which treatment is being given — nothing is hidden.Read more →: everyone knows which treatment is being given, including you and the study team.
From the trial registry
Built from these fields:
- designModule.designInfo.allocation
- designModule.designInfo.maskingInfo.masking
Is there a placebo?
This study does not list a placeboPlaceboA dummy treatment with no active medicine, used for comparison.Read more → group.
From the trial registry
Built from these fields:
- armsInterventionsModule.armGroups[].type
- armsInterventionsModule.armGroups[].interventionNames
Who the study is looking for
The study lists a minimum age of 18 years, with no upper limit given.
The study is open to people of any sex.
The study does not accept healthy volunteersHealthy volunteerSomeone without the condition being studied who takes part anyway.Read more →.
These are the criteria the study lists. Only the trial siteTrial siteA hospital or clinic where a study is actually run.Read more → can decide whether someone can take part.
From the trial registry
Built from these fields:
- eligibilityModule.minimumAge
- eligibilityModule.sex
- eligibilityModule.healthyVolunteers
How big and how long
The study aims to enrol about 35 people.
The study is currently expected to finish around April 2032.
The main measurement is taken over: Months 7 to 18 after CSL222 treatment.
From the trial registry
Built from these fields:
- designModule.enrollmentInfo.count
- statusModule.completionDateStruct.date
- outcomesModule.primaryOutcomes[].timeFrame
What the study measures
Annualized Bleeding Rate (ABR) — measured over Months 7 to 18 after CSL222 treatment.
From the trial registry
Built from these fields:
- outcomesModule.primaryOutcomes[].measure
- outcomesModule.primaryOutcomes[].timeFrame
Source: NCT06003387 on ClinicalTrials.gov. The full registry text is further down this page — this summary never replaces it.
Not medical advice. What do these terms mean?
What is being tested — in plain terms
About CSL222 (AAV5-hFIXco-Padua)Genetic
Administered as a single IV infusion.
From the trial registry — its own words, unedited.
What a genetic is here: A gene-based treatment — such as gene transfer or gene editing — being studied.
Read the full explanation → · in clinical review
Common questions
Answered from this trial’s registry record. Where the record doesn’t say, these answers say so rather than filling the gap.
Am I eligible for this trial?
Only the trial siteTrial siteA hospital or clinic where a study is actually run.Read more → can decide whether someone can take part. Concord cannot make that determination, and neither can any tool that has not examined you.
What the study lists: a minimum age of 18 years.
The full inclusionInclusion criteriaThe things you must have or be for a study to consider you.Read more → and exclusion criteriaExclusion criteriaThe things that would prevent someone from taking part.Read more → are published on this page, exactly as the study team wrote them.
The useful next step is to bring this trial to your doctor. Answering a few questions first gives them something concrete to review.
From the trial registry
- eligibilityModule.minimumAge
- eligibilityModule.eligibilityCriteria
Is there a placebo?
This study does not list a placeboPlaceboA dummy treatment with no active medicine, used for comparison.Read more → group.
From the trial registry
- armsInterventionsModule.armGroups[].type
Would I know which treatment I am getting?
This study is open-labelOpen-labelEveryone knows which treatment is being given — nothing is hidden.Read more →: everyone knows which treatment is being given, including you and the study team.
There is only one group in this study, so there is no assignment to different treatments.
From the trial registry
- designModule.designInfo.maskingInfo.masking
- designModule.designInfo.allocation
Who can join?
The study lists a minimum age of 18 years, with no upper limit given.
It is open to people of any sex.
It does not accept healthy volunteersHealthy volunteerSomeone without the condition being studied who takes part anyway.Read more →.
Only the trial siteTrial siteA hospital or clinic where a study is actually run.Read more → can confirm whether a particular person can take part.
From the trial registry
- eligibilityModule.minimumAge
- eligibilityModule.sex
- eligibilityModule.healthyVolunteers
How long would this take?
The study's main measurement is taken over: Months 7 to 18 after CSL222 treatment.
The study as a whole is currently expected to finish around 2032-04-02.
How long any one person takes part can differ from the study length. The study team can tell you what the schedule looks like in practice.
From the trial registry
- outcomesModule.primaryOutcomes[].timeFrame
- statusModule.completionDateStruct.date
How many people are taking part?
The study aims to enrol about 35 people.
From the trial registry
- designModule.enrollmentInfo.count
Where is this happening?
This study lists 2 locations, including: Hamilton, Ontario, Canada; Ann Arbor, Michigan, United States.
Sites can open and close during a study, so confirm with the team before travelling.
From the trial registry
- trial_locations
About This Trial
The purpose of this study is to assess the risk of bleeding due to failure of expected pharmacological action of CSL222 in adults with severe or moderately severe hemophilia B with detectable pretreatment AAV5 Nabs.
Other Sites (1)
University of Michigan
Ann Arbor, Michigan, United States
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See if this trial could fit youThis page is for informational purposes only and does not constitute medical advice. Clinical trial eligibility can only be determined by the trial site after proper screening. Trial information is sourced from ClinicalTrials.gov and may not reflect the most current status. Always consult your healthcare provider before making decisions about clinical trial participation.