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A Phase 3, single-arm, multicenter, multinational, open-label, one-way crossover study to investigate the efficacy and safety of fitusiran prophylaxis in male participants aged ≥ 12 years with severe hemophilia A or B with or without inhibitory antibodies to factor VIII or IX

Status
Active, not recruiting
Phases
Phase 3
Study type
Interventional
Source
EU CTIS
Registry ID
CTIS2022-500221-33-01
Acronym
EFC17574 (ATLAS-NEO)
Enrollment
17
Registered
2023-06-20
Start date
2023-07-28
Completion date
Unknown
Last updated
2025-08-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Hemophilia

Brief summary

Annualized Bleeding Rate (ABR) in the fitusiran primary efficacy period

Detailed description

Annualized bleeding rate (ABR) while on fitusiran prophylaxis in the fitusiran primary efficacy period and ABR while on prophylaxis standard of care (SOC) in the SOC period, Annualized bleeding rate (ABR) while on fitusiran prophylaxis in the fitusiran primary efficacy period and ABR while on on-demand standard of care (SOC) in the SOC period, Annualized spontaneous bleeding rate in the fitusiran primary efficacy period and in the SOC period, Annualized joint bleeding rate in the fitusiran primary efficacy period and in the SOC period, Change in Haem-A-QOL physical health score and total score during SOC and during fitusiran prophylaxis, Annualized bleeding rate (ABR) in the fitusiran 18-month efficacy period, Annualized bleeding rate (ABR) in the fitusiran 36-month treatment period, Annualized weight-adjusted consumption of CFC/BPA, Number of participants with adverse events

Interventions

Sponsors

Sanofi-Aventis Recherche & Developpement
Lead SponsorINDUSTRY

Eligibility

Sex/Gender
Male
Age
0 Years to No maximum

Design outcomes

Primary

MeasureTime frame
Annualized Bleeding Rate (ABR) in the fitusiran primary efficacy period

Secondary

MeasureTime frame
Annualized bleeding rate (ABR) while on fitusiran prophylaxis in the fitusiran primary efficacy period and ABR while on prophylaxis standard of care (SOC) in the SOC period, Annualized bleeding rate (ABR) while on fitusiran prophylaxis in the fitusiran primary efficacy period and ABR while on on-demand standard of care (SOC) in the SOC period, Annualized spontaneous bleeding rate in the fitusiran primary efficacy period and in the SOC period, Annualized joint bleeding rate in the fitusiran primary efficacy period and in the SOC period, Change in Haem-A-QOL physical health score and total score during SOC and during fitusiran prophylaxis, Annualized bleeding rate (ABR) in the fitusiran 18-month efficacy period, Annualized bleeding rate (ABR) in the fitusiran 36-month treatment period, Annualized weight-adjusted consumption of CFC/BPA, Number of participants with adverse events

Countries

France, Germany, Greece, Italy, Poland, Spain

Outcome results

None listed

Source: EU CTIS · Data processed: Feb 4, 2026