Primary objective

• To assess the half-life of BIVV001, Standard Half-Life (SHL) rFVIII and Extended Half-Life (EHL) rFVIII after a single intravenous (IV) injection

Secondary objectives

• To characterize additional pharmacokinetic (PK) parameters of BIVV001, SHL rFVIII and EHL rFVIII after a single IV injection
• To evaluate the safety and tolerability of a single IV injection of BIVV001

This is a Phase 1, single center, open-label, sequential treatment, 3-period fixed sequence study to assess PK profiles of BIVV001, SHL and EHL rFVIII after a single IV injection in male, previously treated patients, 18-65 years of age, with severe hemophilia A (defined as <1 IU/dL [<1%] endogenous FVIII).

The expected duration of the study is up to approximately 67 days including

• Screening and washout up to 28 days,
• Advate® dosing, PK sampling, including washout: approximately 4 days,
• Adynovi® dosing and PK sampling, including washout: approximately 7 days,
• BIVV001 dosing and PK sampling: approximately 14 days, Remainder of Safety Observation Period: approximately 14 days.

Inclusion Criteria:

• Severe hemophilia A, defined as <1 IU/dL (<1%) endogenous FVIII activity.
• Previous treatment for hemophilia A, defined as at least 150 days documented prior exposure to any recombinant and/or plasma-derived FVIII and/or cryoprecipitate products at Day 1.
• Platelet count ≥100,000 cells/µL at Screening.
• A participant known to be human immunodeficiency virus (HIV) antibody positive, either previously documented or identified from screening assessments, must have the following results prior to enrollment. (CD4 lymphocyte count >200 cells/mm³ - Viral load of <400 copies/mL).

Exclusion Criteria:

• Any concurrent clinically significant liver disease that, in the opinion of the Investigator, would make the participant unsuitable for enrollment. This may include, but is not limited to cirrhosis, portal hypertension, and acute hepatitis.
• Serious active bacterial, fungal or viral infection (other than chronic hepatitis or HIV) present within 30 days of Screening.
• Other known coagulation disorder(s) in addition to hemophilia A.
• History of hypersensitivity or anaphylaxis associated with any FVIII product.
• History of a positive inhibitor test defined as ≥0.6 BU/mL, or any value greater than or equal to the lower sensitivity cut-off for laboratories with cut-offs for inhibitor detection between 0.7 and 1.0 BU/mL, or clinical signs or symptoms of decreased response to FVIII administrations. Family history of inhibitors will not exclude the participant.
• Positive inhibitor result, defined as ≥0.6 BU/mL at Screening.
• Major surgery within 8 weeks of Screening.
• Sensitivity to any of the study interventions, or components thereof, or drug or other allergy.

The above information is not intended to contain all considerations relevant to a patient's potential participation in a clinical trial.

Qualified researchers may request access to patient level data and related study documents including the clinical study report, study protocol with any amendments, blank case report form, statistical analysis plan, and dataset specifications. Patient level data will be anonymized and study documents will be redacted to protect the privacy of trial participants. Further details on Sanofi's data sharing criteria, eligible studies, and process for requesting access can be found at: https://vivli.org