A Study to Test a Medicine (Fitusiran) for Preventing Bleeds in People With Severe Hemophilia Who Previously Received Preventive Treatment With Emicizumab

Phase 4RecruitingNCT06145373

Sanofi20 enrolled

Overview

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.

Study Type

INTERVENTIONAL

Allocation

Purpose

TREATMENT

Masking

NONE

Enrollment

Conditions

Hemophilia A

Interventions

Eligibility

Sex: MALEMin age: 12 Years

Medical Language ↔ Plain English

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.

Outcomes

Primary Outcomes

Number of participants with Adverse events (AEs) during the fitusiran treatment

Incidence, severity, and seriousness, of AEs occurred during fitusiran treatment period will be reported

Time frame: From Day 1 up to Month 4

Secondary Outcomes

The peak thrombin generation (TG) - pre fitusiran treatment

Central laboratory assessments (peak TG) will be reported for pre-fitusiran period

Time frame: From Month -2 up to Day 1

The peak TG during fitusiran treatment

Central laboratory assessments (peak TG) will be reported for fitusiran treatment period

Time frame: From Day 1 up to Month 4

The antithrombin (AT) levels during pre-fitusiran treatment

Central laboratory assessments (AT) will be reported for pre-fitusiran treatment period

Time frame: From Month -2 up to Day 1

The AT levels during fitusiran prophylaxis

Central laboratory assessments (AT) will be reported for fitusiran treatment

Time frame: From Day 1 up to Month 4

Emicizumab concentrations in plasma

Emicizumab concentrations in plasma will be reported

Time frame: Up to Month 4 of fitusiran treatment

Number of participants with AEs from Day 1 to Month 18 of fitusiran treatment

Incidence, severity, and seriousness of AEs will be reported

Time frame: From Day 1 up to Month 18

Change in participants' overall treatment satisfaction during the fitusiran treatment period assessed via the Treatment Satisfaction Questionnaire for Medication (TSQM-9) domain scores

The three domains of effectiveness, convenience, and global satisfaction will be reported

Time frame: From approximately Month -2 to Month 19 [end of study (EoS) visit]

Participants' treatment preferences (via the Preference Questionnaire)

The Preference questionnaire Data will be reported

Time frame: At Month 12

Change in adult participants' pain intensity during the fitusiran treatment period over time

The PROMIS (Patient-Reported Outcomes Measurement Information System) Pain Intensity 3a v2.0 consists of three items measuring the worst, average, and current intensity of pain with a recall period of 7 days. Each question has five response options ranging from one ('no pain') to five ('very severe'). Adult participants (age ≥ 18 years) will self-complete the PROMIS Pain Intensity 3a v2.0 questionnaire.

Time frame: From approximately Month - 2 to Month 19 (EoS) visit

Change in adolescent participants' pain intensity during the fitusiran treatment period over time

The PROMIS Pediatric Numeric Rating Scale v.1.0 - Pain Intensity 1a consists of one item measuring the average intensity of pain with a recall period of 7 days. The question has ten response options ranging from one ('no pain') to ten ('worst pain'). Adolescent participants (age ≥12 years and \<17 years) will self-complete the PROMIS Pediatric Pain Intensity 1a v.1.0.

Time frame: From approximately Month - 2 to Month 19 (EoS) visit

Change in participants' physical functioning and physical activity during the fitusiran treatment period (via the International Physical Activity Questionnaire [IPAQ]) over time

Participants' physical functioning and physical activity data during the fitusiran treatment period will be collected via the International Physical Activity Questionnaire and reported

Time frame: From approximately Month - 2 to Month 19 (EoS) visit

Change in participants' joint health (via the Hemophilia Joint Health Score [HJHS]) during the fitusiran treatment period over time

HJHS during the fitusiran treatment period will be reported

Time frame: From approximately Month - 2 to Month 19 (EoS) visit

Annualized Bleeding Rate (ABR) while receiving fitusiran prophylaxis

The frequency of treated bleeding episodes will be reported

Time frame: From Month 4 up to Month 18 (14-month extension period)

A Study to Test a Medicine (Fitusiran) for Preventing Bleeds in People With Severe Hemophilia Who Previously Received Preventive Treatment With Emicizumab

Overview

Conditions

Interventions

Eligibility

Locations (2)

Outcomes

Primary Outcomes

Secondary Outcomes

Central Contacts