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efanesoctocog alfa

Phase 4

Factor VIII Deficiency | Monoclonal antibody | Hematology |Sanofi|Trials Updated: Jul 28, 2026

efanesoctocog alfa development status

Highest phase Phase 4 (NCT06941870)
Phase scored for SNYPhase 3
Registered trials 4 across 1 sponsor since Sep 2021

efanesoctocog alfa target and mechanism

Molecular targetF8
Target classExogenous Protein
ModalityMonoclonal antibody

Also known as efanesoctocog alfa (BIVV001), BIVV001

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials6
Total Enrollment529

FDA Designations

No designations recorded

efanesoctocog alfa clinical trials

efanesoctocog alfa · 6 trials · 3 indications

Phase 3 3Phase 1 3
NCT04644575Long-term Safety and Efficacy of Efanesoctocog Alfa (BIVV001) in Previously Treated Patients With Hemophilia AHemophilia A
ACTIVE NOT_RECRUITING261 Analytics
NCT04759131Safety, Efficacy and PK of BIVV001 in Pediatric Patients With Hemophilia AHemophilia A
COMPLETED74 Analytics
NCT04161495A Phase 3 Open-label Interventional Study of Intravenous Recombinant Coagulation Factor VIII Fc-von Willebrand Factor-XTEN Fusion Protein, Efanesoctocog Alfa (BIVV001), in Patients With Severe Hemophilia AFactor VIII Deficiency
COMPLETED159 Analytics
PHASE3ACTIVE NOT_RECRUITING
Long-term Safety and Efficacy of Efanesoctocog Alfa (BIVV001) in Previously Treated Patients With Hemophilia A
Hemophilia AUnlock trial analytics
PHASE3COMPLETED
Safety, Efficacy and PK of BIVV001 in Pediatric Patients With Hemophilia A
Hemophilia AUnlock trial analytics
PHASE3COMPLETED
A Phase 3 Open-label Interventional Study of Intravenous Recombinant Coagulation Factor VIII Fc-von Willebrand Factor-XTEN Fusion Protein, Efanesoctocog Alfa (BIVV001), in Patients With Severe Hemophilia A
Factor VIII DeficiencyUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of participants with the occurrence of inhibitor development (neutralizing antibodies detected against factor VIII [FVIII])
Baseline to month 48

The number of participants with the occurrence of inhibitor development (neuatralizing antibodies detected against factor VIII \[FVIII\]) as determined via the Nijmegen modified Bethesda assay.

Number of Participants With Neutralising Antibodies (Development of Inhibitors) Directed Against Factor VIII
Baseline up to Week 52

Inhibitor development was defined as an inhibitor result of greater than or equal to (\>=0.6) Bethesda units (BU/mL) that was confirmed by a second test result from a separate sample, drawn 2 to 4 weeks following the date when the original sample was drawn. Both tests must have been performed by the central laboratory using the Nijmegen modified Bethesda assay.

Estimated Annualized Bleeding Rate (ABR) in Arm A: Prophylaxis
Baseline to Week 52

ABR is annualized number of treated bleeding episodes (BE) per participant per year. Treated Bleeding episode: any occurrence of hemorrhage that required administration of BIVV001. It started from 1st sign of bleed and ended no more than 72 hours after last injection to treat bleeding episode, any subsequent bleeding at same location/injections administered less than or equal to (\<=) 72 hours apart from previous injection were considered same bleeding episode. ABR=number of treated BE during efficacy period (EP)/number of days during EP\*365.25. EP reflects the sum of all intervals of time during which participants were treated with BIVV001 according to the study arms and treatment regimens. This outcome measure (OM) presents estimated results (i.e., results estimated by fitting negative binomial \[NB\] regression model on data collected during EP).

Observed Annualized Bleeding Rate in Arm A: Prophylaxis
Baseline to Week 52

ABR is annualized number of treated bleeding episodes per participant per year. Treated Bleeding episode: any occurrence of hemorrhage that required administration of BIVV001. It started from 1st sign of bleed and ended no more than 72 hours after last injection to treat bleeding episode, any subsequent bleeding at same location/injections administered \<=72 hours apart from previous injection were considered same bleeding episode. ABR=number of treated bleeding episodes during EP/number of days during EP\*365.25. EP reflects the sum of all intervals of time during which participants were treated with BIVV001 according to the study arms and treatment regimens. This OM presents observed results (i.e., descriptive statistics values based on the data which was collected during EP).

Half-life of BIVV001
BIVV001 period: Predose, and post-dose from 0.17 hr to 336 hr, and at day 28
Half-life of SHL rFVIII
Advate® period: Predose, and post-dose from 0.17 hr to 72 hr
Half-Life of EHL rFVIII
Adynovi® period: Predose, and post-dose from 0.17 hr to 120 hr
Pharmacokinetic Parameter: Maximum plasma concentration observed (Cmax)
Day 1 to Day 10
Pharmacokinetic Parameter: Terminal half-life (t½z)
Day 1 to Day 10
Pharmacokinetic Parameter: Total Clearance (CL)
Day 1 to Day 10
Pharmacokinetic Parameter: Volume of distribution at steady state (Vss)
Day 1 to Day 10
Pharmacokinetic Parameter: Area under the activity time curve extrapolated to infinity (AUC∞)
Day 1 to Day 10
Pharmacokinetic Parameter: Mean residence time (MRT)
Day 1 to Day 10
Pharmacokinetic Parameter: Incremental recovery (IR)
Day 1 to Day 10
Number of Participants With Treatment Emergent Adverse Events (TEAE) and Treatment Emergent Serious Adverse Event (TESAE) During Advate Treatment Period
Up to Day 3 for Advate 25 IU/kg; up to Day 4 for Advate 65 IU/kg

AE was defined as any untoward medical occurrence in a participant who received study drug and did not necessarily had a causal relationship with the treatment. TEAE is defined as any AE that begins on or after the single dose of Advate but before the single dose of BIVV001. Serious AE (SAE) was defined as any AE resulting in death, immediate risk of death, inpatient hospitalization or prolongation of existing hospitalization, persistent or significant disability/incapacity, or a congenital/anomaly/birth defect, or any other medically important event.

Number of Participants With Treatment Emergent Adverse Events (TEAE) and Treatment Emergent Serious Adverse Event (TESAE) During BIVV001 Treatment Period
Up to 28 days after BIVV001 administration

AE was defined as any untoward medical occurrence in a participant who received study drug and did not necessarily had a causal relationship with the treatment. TEAE is defined as any AE that begins on or after the study treatment (BIVV001) and within 28 days after BIVV001 administration. SAE was defined as any AE resulting in death, immediate risk of death, inpatient hospitalization or prolongation of existing hospitalization, persistent or significant disability/incapacity, or a congenital/anomaly/birth defect, or any other medically important event.

Number of Participants With Clinically Significant Abnormalities in Laboratory Tests During Advate Treatment Period
Up to Day 3 for Advate 25 IU/kg; up to Day 4 for Advate 65 IU/kg

Number of Participants with Clinically Significant Abnormalities in Laboratory tests (including hematology, clinical chemistry, urinalysis, and coagulation and thrombosis markers) was reported.

Number of Participants With Clinically Significant Abnormalities in Laboratory Tests During BIVV001 Treatment Period
Up to 28 days after BIVV001 administration

Number of participants with clinically significant abnormalities (including hematology, clinical chemistry, urinalysis, and coagulation and thrombosis markers) was reported.

Percentage of Participants With Confirmed Inhibitor Development as Measured by the Nijmegen-Modified Bethesda Assay
Up to 28 days after BIVV001 administration

Development of an inhibitor was defined as a neutralizing antibody value of greater than or equal to (\>=) 0.6 Bethesda units per milliliter (BU/mL) identified and confirmed by a second test on an independent sample, collected within 2 to 4 weeks of the first positive sample, with both tests performed by the central laboratory using Nijmegen-modified Bethesda assay.

Secondary Endpoints

Annual bleeding rate (ABR)
Baseline to month 48
Annualized bleeding rate (ABR) by type of bleed
Baseline to month 48
Annualized bleeding rate (ABR) by location
Baseline to month 48
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Arm A: Previously treated in BIVV001 studyEXPERIMENTALThis arm includes participants who have completed study EFC16293 or study EFC16295, participants who have completed Arm B or Arm C of this study (LTS16294) and roll over into Arm A, and participants who have completed any other potential BIVV001 study. Participants in this arm will continue receiving BIVV001 prophylaxis treatment once weekly (QW) for a total of 100 exposure days (EDs) cumulative from the parent study and this study. Participants will have the opportunity to continue in this study for up to 4 years, unless BIVV001 is commercially available in their applicable participating country.
Arm B: Newly initiated (China Only) in BIVV001EXPERIMENTALThis arm includes Chinese participants of any age who will be newly initiated on BIVV001 prophylaxis treatment once-weekly (QW) for 52 weeks. After 52 weeks of treatment in this arm B, participants will be able to roll over into arm A.
Arm C: Newly initiated in BIVV001 with planned major surgeryEXPERIMENTALThis arm includes participants of any age who will be newly initiated on BIVV001 prophylaxis treatment once-weekly (QW) and will undergo planned major surgery after at least 6 initial EDs with BIVV001, and within 26 weeks from Day 1. After 52 weeks of treatment in arm C, participants will be able to roll into arm A.
BIVV001: Participants aged <6 YearsEXPERIMENTALParticipants aged less than (\<) 6 years received BIVV001 at a dose of 50 international units per kilogram (IU/kg) intravenous (IV) injection once-weekly (QW) prophylaxis for 52 weeks.
BIVV001: Participants aged 6 to <12 YearsEXPERIMENTALParticipants aged 6 to \<12 years received BIVV001 at a dose of 50 IU/kg IV injection QW prophylaxis for 52 weeks.
Arm A: ProphylaxisEXPERIMENTALParticipants who were on a prophylaxis treatment with a FVIII product prior to study EFC16293 including participants who rolled over from study OBS16221, received BIVV001 50 international units per kilogram (IU/kg) intravenous (IV) injection once-weekly (QW) for 52 weeks in the current study. Study OBS16221 participants with 6 months historical data on prophylaxis treatment with a marketed FVIII product prior to enrollment were analyzed as a subgroup (named as: Arm A: Historical Prophylaxis \[OBS16221\]) in the outcome measure analysis.
Arm B: On-Demand Then ProphylaxisEXPERIMENTALParticipants who were on an on-demand treatment regimen with a FVIII product prior to study EFC16293, including participants who rolled over from study OBS16221, received BIVV001 50 IU/kg IV injection as an on-demand treatment (as needed for the treatment of bleeding episodes) from Week 1 to Week 26 in current study. At Week 26, participants in Arm B were switched to prophylaxis treatment, and received BIVV001 50 IU/kg, IV injection QW until Week 52.
efanesoctocog alfa (BIVV001)EXPERIMENTALEach participant will be sequentially dosed with three single intravenous (IV) doses of first rFVIII (Advate®), second Polyethylene Glycol (PEG)-rFVIII (Adynovi® or Adynovate®), and lastly, BIVV001
Low Dose Cohort: Advate 25 IU/kg Then BIVV001 25 IU/kgEXPERIMENTALParticipants received a single intravenous (IV) dose of Advate 25 international units per kilogram (IU/kg) on Day 1 of Advate treatment period (3 days) followed by a single IV dose of BIVV001 25 IU/kg in BIVV001 treatment period (BTP) (28 days). Advate treatment period (ATP) consisted of a washout of at least 72 hours which was started from the time of Advate dosing.
High Dose Cohort: Advate 65 IU/kg Then BIVV001 65 IU/kgEXPERIMENTALParticipants received a single IV dose of Advate 65 IU/kg on Day 1 of ATP (4 days) followed by a single IV dose of BIVV001 65 IU/kg in BTP (28 days). ATP consisted of a washout of at least 96 hours which was started from the time of Advate dosing.

Interventions

NameTypeDescription
efanesoctocog alfa (BIVV001)DRUGPharmaceutical form:Solution for Injection Route of administration: Intravenous
Efanesoctocog alfaDRUGSolution for injection Intravenous
Octocog alfaDRUGSolution for injection Intravenous
Rurioctocog alfa pegolDRUGSolution for injection Intravenous
Advate (Low Dose)BIOLOGICALParticipants received a single IV low dose of Advate 25 IU/kg.
Advate (High Dose)BIOLOGICALParticipants received a single IV high dose of Advate 65 IU/kg.
BIVV001 (Low Dose)BIOLOGICALParticipants received single IV low dose of BIVV001 25 IU/kg.
BIVV001 (High Dose)BIOLOGICALParticipants received single IV high dose of BIVV001 65 IU/kg.
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Eligibility Criteria

Age RangeN/A to 11 Years
SexALL
Healthy VolunteersNo
Study Sites85

Inclusion criteria : * For participants rolling over into Arm A * Participants who have completed the studies EFC16923, EFC16925, Arm B or Arm C of the current study, or any other potential BIVV001 study. * Male or Female * For participants new to BIVV001 (Arm B and C) * Participants who ha...

Countries:United StatesArgentinaAustraliaBelgiumBrazilBulgariaCanadaChinaFranceGermanyGreeceHungaryIrelandItalyJapanNetherlandsSouth KoreaSpainSwedenSwitzerlandTaiwanTurkey (Türkiye)United KingdomMexico
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Recent Changes (Last 90 Days)

LOWAug 1, 2026NCT04644575lastUpdatePostDate: changed
LOWAug 1, 2026NCT04644575lastUpdatePostDate: changed
LOWAug 1, 2026NCT04644575lastUpdatePostDate: changed

Frequently asked questions about efanesoctocog alfa

What is efanesoctocog alfa used for?

Efanesoctocog alfa is an investigational therapy being studied for Factor VIII deficiency, Von Willebrand's Disease (VWD), and Hemophilia A. It is a monoclonal antibody being developed by Sanofi (SNY). The drug is currently in Phase 3 clinical development for these hematologic conditions.

What does efanesoctocog alfa target?

Efanesoctocog alfa targets the F8 gene product, which is coagulation factor VIII. It is classified as an exogenous protein therapy designed to address Factor VIII deficiency. The drug is being evaluated in patients with severe Hemophilia A and other related bleeding disorders.

Who makes efanesoctocog alfa?

Efanesoctocog alfa is being developed by Sanofi, a company traded under the ticker SNY. The drug is also known as efanesoctocog alfa (BIVV001). Sanofi is conducting clinical trials to evaluate the safety and efficacy of this investigational therapy.

What phase is efanesoctocog alfa in?

Efanesoctocog alfa is in Phase 3 clinical development. It is an investigational drug and has not been approved by regulatory authorities. The Phase 3 trials are studying the drug in patients with severe Hemophilia A and Factor VIII deficiency.

What clinical trials is efanesoctocog alfa in?

Efanesoctocog alfa has been studied in several clinical trials. NCT04161495 is a completed Phase 3 study in patients with severe Hemophilia A. NCT04644575 is an active Phase 3 long-term safety study in Hemophilia A. NCT04770935 and NCT05042440 are completed Phase 1 studies in Von Willebrand's Disease and Hemophilia A.

Is efanesoctocog alfa the same as BIVV001?

Yes, efanesoctocog alfa is also known as efanesoctocog alfa (BIVV001). The drug is referred to by both names in clinical trial documentation. Sanofi is developing this therapy under the code name BIVV001 for the treatment of bleeding disorders.