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Showing 1–9 of 9 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Fitusiran Clear all
Completed Phase 3 Interventional Results available

A Study of Fitusiran (ALN-AT3SC) in Severe Hemophilia A and B Patients Without Inhibitors

NCT03417245
View directory record Official record
Conditions
Hemophilia A, Hemophilia B
Interventions
fitusiran, factor concentrates
Drug
Lead sponsor
Genzyme, a Sanofi Company
Industry
Eligibility
12 Years and older · Male only
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
8
States / cities
Little Rock, Arkansas • Gainesville, Florida • Tampa, Florida + 5 more
Source: ClinicalTrials.gov public record
Updated Mar 27, 2022 · Synced Sep 1, 2026, 8:58 PM EDT
Active, not recruiting Phase 2Phase 3 Interventional

Fitusiran Prophylaxis in Male Pediatric Subjects Aged 1 to Less Than 12 Years With Hemophilia A or B

NCT03974113
View directory record Official record
Conditions
Hemophilia
Interventions
Fitusiran
Drug
Lead sponsor
Genzyme, a Sanofi Company
Industry
Eligibility
1 Year to 11 Years · Male only
Enrollment
32 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2026
U.S. locations
4
States / cities
Los Angeles, California • Hackensack, New Jersey • Cleveland, Ohio + 1 more
Source: ClinicalTrials.gov public record
Updated Jun 21, 2026 · Synced Sep 1, 2026, 8:58 PM EDT
Active, not recruiting Phase 3 Interventional

Long-term Safety and Efficacy Study of Fitusiran in Patients With Hemophilia A or B, With or Without Inhibitory Antibodies to Factor VIII or IX

NCT03754790
View directory record Official record
Conditions
Hemophilia
Interventions
Fitusiran
Drug
Lead sponsor
Genzyme, a Sanofi Company
Industry
Eligibility
12 Years and older · Male only
Enrollment
281 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2026
U.S. locations
10
States / cities
Phoenix, Arizona • Los Angeles, California • Orange, California + 7 more
Source: ClinicalTrials.gov public record
Updated Dec 16, 2025 · Synced Sep 1, 2026, 8:58 PM EDT
Completed Phase 3 Interventional Results available

A Study of Fitusiran (ALN-AT3SC) in Severe Hemophilia A and B Patients With Inhibitors

NCT03417102
View directory record Official record
Conditions
Hemophilia A, Hemophilia B
Interventions
fitusiran, Bypassing agents
Drug
Lead sponsor
Genzyme, a Sanofi Company
Industry
Eligibility
12 Years and older · Male only
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
12
States / cities
Phoenix, Arizona • Los Angeles, California • Orange, California + 9 more
Source: ClinicalTrials.gov public record
Updated Mar 27, 2022 · Synced Sep 1, 2026, 8:58 PM EDT
Completed Phase 1Phase 2 Interventional Results available

An Open-label Extension Study of an Investigational Drug, Fitusiran, in Patients With Moderate or Severe Hemophilia A or B

NCT02554773
View directory record Official record
Conditions
Hemophilia A, Hemophilia B
Interventions
Fitusiran (SAR439774)
Drug
Lead sponsor
Genzyme, a Sanofi Company
Industry
Eligibility
18 Years and older · Male only
Enrollment
34 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2023
U.S. locations
2
States / cities
Ann Arbor, Michigan • Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 4, 2024 · Synced Sep 1, 2026, 8:58 PM EDT
Completed Phase 3 Interventional Results available

A Study of Fitusiran in Severe Hemophilia A and B Patients Previously Receiving Factor or Bypassing Agent Prophylaxis

NCT03549871
View directory record Official record
Conditions
Hemophilia
Interventions
Fitusiran, BPA prophylaxis, Factor (FVIII or FIX) prophylaxis
Drug
Lead sponsor
Genzyme, a Sanofi Company
Industry
Eligibility
12 Years and older · Male only
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2022
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Feb 5, 2023 · Synced Sep 1, 2026, 8:58 PM EDT
Active, not recruiting Phase 3 Interventional

A Study to Test a Medicine (Fitusiran) Injected Under the Skin for Preventing Bleeding Episodes in Male Adolescent or Adult Participants With Severe Hemophilia

NCT05662319
View directory record Official record
Conditions
Hemophilia
Interventions
Fitusiran, Clotting factor concentrates (CFC) or bypassing agents (BPA), Antithrombin concentrate (ATIIIC)
Drug
Lead sponsor
Sanofi
Industry
Eligibility
12 Years and older · Male only
Enrollment
91 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2029
U.S. locations
8
States / cities
Orange, California • Minneapolis, Minnesota • Hackensack, New Jersey + 5 more
Source: ClinicalTrials.gov public record
Updated Feb 3, 2026 · Synced Sep 1, 2026, 8:58 PM EDT
Recruiting Phase 4 Interventional

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

NCT06145373
View directory record Official record
Conditions
Hemophilia A
Interventions
Fitusiran (SAR439774), Clotting factor concentrates (CFC) or bypassing agents (BPA), Antithrombin concentrate (ATIIIC), Emicizumab
Drug · Biological
Lead sponsor
Sanofi
Industry
Eligibility
12 Years and older · Male only
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2030
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jun 1, 2026 · Synced Sep 1, 2026, 8:58 PM EDT
Recruiting Phase 3 Interventional

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

NCT07285460
View directory record Official record
Conditions
Hemophilia
Interventions
Fitusiran, Clotting factor concentrates (CFC) or bypassing agents (BPA), Antithrombin concentrate (ATIIIC)
Drug · Biological
Lead sponsor
Sanofi
Industry
Eligibility
1 Year to 11 Years · Male only
Enrollment
85 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2031
U.S. locations
5
States / cities
Los Angeles, California • Orange, California • Las Vegas, Nevada + 2 more
Source: ClinicalTrials.gov public record
Updated Aug 16, 2026 · Synced Sep 1, 2026, 8:58 PM EDT