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Study identifier: NCT07285460 Synced from ClinicalTrials.gov · July 29, 2026
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A Study to Investigate the Efficacy and Safety of Fitusiran Prophylaxis in Male Participants Aged 1 to Less Than 12 Years With Hemophilia A or B

Condition: Hemophilia  ·  Sponsor: Sanofi

PhasePhase 3
Planned participants85
Who can joinMale, 1 Year to 11 Years
Healthy volunteersNo

About this study

This is a parallel, Phase 3, two-arm, open-label study to evaluate the efficacy and safety of treatment with fitusiran prophylaxis administered to male pediatric participants (aged 1 to \<12 years) who have severe hemophilia A or B, with or without inhibitory antibodies to FVIII or FIX. Number of participants: Approximately 85 participants will be enrolled into the study: * Approximately 60 fitusiran-naïve participants with severe hemophilia A or B, with or without inhibitors (fitusiran-naïve arm), and * Approximately 25 participants with severe hemophilia A or B with inhibitors rolling over from the EFC15467\* dose confirmation study (roll-over arm). * Fitusiran has been investigated in the pediatric population in study EFC15467, which enrolled male participants aged 1 to \<12 years with hemophilia A or B with inhibitors to examine the safety and tolerability of fitusiran in the pediatric population. Participants will be enrolled into 1 of 2 arms: * Fitusiran-naïve: these participants have not previously received fitusiran, and they will undergo screening and study eligibility assessments. Once enrolled, they will go through a 24-week standard of care (SOC) period before starting fitusiran prophylaxis. * Roll-over participants from the EFC15467 study: only participants who are still on active treatment in study EFC15467 and consenting to study EFC17905 will be eligible to roll over. They will not need to undergo screening or further eligibility assessments. They will…

This description comes directly from the study's public registry record.

Talk to the study team

Trial Transparency email recommended (Toll free for US & Canada)  ·  800-633-1610  ·  Contact-US@sanofi.com

Always discuss trial participation with your own doctor first.

Locations (30)

The Luskin Orthopaedic Institute for Children- Site Number : 8400013Los Angeles, California, United StatesRecruiting
The Center for Inherited Blood Disorders- Site Number : 8400009Orange, California, United StatesRecruiting
Cure 4 The Kids Foundation- Site Number : 8400001Las Vegas, Nevada, United StatesRecruiting
Hackensack Meridian Health - Hackensack University Medical Center- Site Number : 8400008Hackensack, New Jersey, United StatesRecruiting
University of Texas - Southwestern Medical Center- Site Number : 8400015Dallas, Texas, United StatesRecruiting
Investigational Site Number : 0560002Brussels, BelgiumRecruiting
Investigational Site Number : 0560001Brussels, BelgiumRecruiting
Hospital das Clinicas da Faculdade de Medicina de Ribeirao Preto- Site Number : 0760003Ribeirão Preto, São Paulo, BrazilRecruiting
Hospital das Clinicas da Faculdade de Medicina da Universidade de Sao Paulo- Site Number : 0760004São Paulo, BrazilRecruiting
Investigational Site Number : 1240001Hamilton, Ontario, CanadaRecruiting
Investigational Site Number : 1240003Montreal, Quebec, CanadaRecruiting
Investigational Site Number : 1560001Beijing, ChinaRecruiting

+ 18 more locations — full list on the registry record.

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Source record: clinicaltrials.gov/study/NCT07285460