Study of VGA039 in Healthy Volunteers and Patients With Von Willebrand Disease (VIVID)

This first-in-human study consists of 5 parts based on the subject population. Part 1 is a randomized, double-blind, placebo-controlled, single-ascending dose (SAD) evaluation of IV or SC VGA039 or placebo in up to 8 cohorts in healthy volunteers. Part 2 is an open-label, SAD of SC or IV VGA039 in up to 8 cohorts in subjects diagnosed with VWD. All participants will be enrolled, treated, and followed up for 15 weeks (IV SAD) or 8 weeks(SC SAD). Part 3 is an open-label, Phase 1b study of SC multiple doses (MD) of VGA039 in up to 4 cohorts. Part 4 is an open-label, Phase 2 study of SC single, surgical prophylaxis (SP) doses of VGA039 administered prior to a minor surgical procedure in subjects diagnosed with VWD in up to 2 cohorts. Part 5 is an open-label extension (OLE) study of SC MD of VGA039 in eligible subjects diagnosed with VWD who have previously participated in a VGA039 interventional trial.

Key Inclusion Criteria (All Subjects)

• Subjects, 18 to 60 years of age, inclusive for Parts 1 and 2
• Subjects, 12 to 60 years of age, inclusive for Parts 3 and 5
• No clinically significant laboratory, ECG, or vital signs results.

Additional Key Inclusion Criteria (for Subjects in Part 1 Only) • Body mass index of 18-32 kg/m2

Additional Key Inclusion Criteria (for Subjects in Part 2 Only)

• Subjects with VWD who are symptomatic, defined as having a history of bleeding or bruising.
• Hemoglobin level ≥ 8 g/dL and platelet count ≥ 150 × 109/L at Screening.

Exclusion Key Criteria (All Subjects)

• Use of hormonal contraceptives within 56 days prior to administration of the study drug.
• Subjects with detection of FV Leiden or Prothrombin G20210A mutation, protein C or S deficiency, antithrombin deficiency, or antiphospholipid antibody syndrome at Screening.
• Subjects with other known pro-thrombotic disorders or abnormal findings in any prior laboratory thrombophilia evaluation.
• History of arterial or venous thrombosis, including superficial thrombophlebitis, or embolism.
• Evidence of renal, hepatic, central nervous system, respiratory, cardiovascular disease, cerebrovascular disease, peripheral vascular disease, or metabolic dysfunction.

Additional Key Exclusion Criterion (Subjects in Part 1 Only)

• Baseline FVIII activity > 150 IU/dL.

Additional Key Exclusion Criteria (Subjects in Parts 2, 3, 4 and 5 Only)

• Baseline FVIII activity > 50 IU/dL.
• Any acute, clinically significant bleeding event requiring surgical or procedural intervention within 7 days prior to receiving study drug.