A Study to Test a Medicine (Fitusiran) for Preventing Bleeds in People With Severe Hemophilia Who Previously Received Preventive Treatment With Emicizumab
Sanofi · NCT06145373
Opens the official ClinicalTrials.gov record, with the study team’s contacts. Bored Studies doesn’t enroll anyone.
Key facts
- Compensation
- Not posted. Ask the study team before screening.
- Who can join
- Ages 12+ · Men only
- Healthy volunteers
- Not accepted (a condition is required)
- Study type
- Interventional · Phase 4
- Target enrollment
- 20
- US sites recruiting
- 2
- Study start
- March 1, 2024
- Record last updated
- September 23, 2026
Status re-checked against ClinicalTrials.gov within the last 12 hours.
What the study is about
This is an exploratory, single group, Phase 4, study to assess treatment with fitusiran prophylaxis after switching from emicizumab prophylaxis.
This study aims to evaluate the safety and tolerability of switching to fitusiran after a transition period from the last dose of emicizumab. The study will be conducted in male participants with severe hemophilia A, with or without inhibitors, aged ≥12 years, who were previously receiving emicizumab prophylaxis.
Study details include
- The study duration will be up to approximately 28 months:
- There will be an approximately 2-month screening period.
- There will be an approximately 2-month period before fitusiran treatment starts (pre-fitusiran treatment period)
- The fitusiran treatment duration will be up to 18-months (fitusiran treatment period)
- The antithrombin (AT) follow-up (FU) period will be approximately 6 months after the last dose of fitusiran (during which the AT activity level will be monitored at approximately monthly intervals following the final fitusiran dose until AT activity levels return to at least 60%).
- The study site visits are scheduled at monthly/ every 2 months intervals of 28 days (4 weeks) / 56 days (8 weeks), respectively, during the fitusiran treatment period.
Being studied: Fitusiran (SAR439774); Clotting factor concentrates (CFC) or bypassing agents (BPA); Antithrombin concentrate (ATIIIC); Emicizumab
Conditions: Hemophilia A
Eligibility criteria
Copied from the official record. The study team makes the final decision at screening.
Show full criteria
Inclusion Criteria
- Male participants must be ≥12 years of age inclusive, at the time of signing the informed consent
- Diagnosis of severe congenital hemophilia A (FVIII \< 1%) as evidenced by a central laboratory measurement at screening or documented medical record evidence.
- Inhibitor titer of ≥0.6 BU/mL at Screening, or
- Inhibitor titer of \<0.6 BU/mL at Screening with medical record evidence of 2 consecutive titers ≥0.6 BU/mL, or
- Inhibitor titer of \<0.6 BU/mL at Screening with medical record evidence of anamnestic response.
- Participants who are currently on the full labeled dose of emicizumab prophylaxis, irrespective of inhibitor/non-inhibitor status.
- Signed informed consent/assent which includes compliance with the requirements and restrictions listed in the informed consent form (ICF) and in this protocol.
Exclusion Criteria
Participants are excluded from the study if any of the following criteria apply:
- Known coexisting bleeding disorders
- History of antiphospholipid antibody syndrome.
- History of arterial or venous thromboembolism, atrial fibrillation, significant valvular disease, myocardial infarction, angina, transient ischemic attack, or stroke. Participants who have experienced thrombosis associated with indwelling venous access may be enrolled.
- Presence of clinically significant liver disease
- Current or prior participation in a fitusiran trial
- Current or prior participation in a gene therapy trial
- AT activity \<60% at Screening, as determined by central laboratory measurement
- Coexisting thrombophilic disorder - Hepatitis C virus antibody positive, except participants who have negative Hepatitis C viral load and no evidence of cirrhosis
- Presence of acute hepatitis, ie, hepatitis A, hepatitis E.
- Presence of acute or chronic hepatitis B infection
- Known to be HIV positive with CD4 count \<200 cells/μL.
- Reduced renal function
The above information is not intended to contain all considerations relevant to a patient's potential participation in a clinical trial.
Recruiting US locations
Children's Hospital Los Angeles- Site Number : 8400005
Los Angeles, CA 90027
Southern Specialty Research- Site Number : 8400011
Flowood, MS 39232
Study contacts (from the official record)
- Trial Transparency email recommended (Toll free for US & Canada) · 800-633-1610 · Contact-US@sanofi.com