This is a phase 3 study that will evaluate subcutaneous (SC) VGA039 in patients with von Willebrand Disease (VWD)

This Phase 3 multicenter, open-label, single-sequence cross-over study will investigate the safety and efficacy of subcutaneous administration of VGA039 as prophylaxis for bleeding in patients with every type of VWD. The study consists of an Observational Period of at least 24 weeks followed by an Active Treatment Period of approximately 49 weeks of VGA039 treatment. Bleeding data and details of treatments used will be collected from each patient during both study periods. The number, duration, location, and types of bleeds experienced, as well as treatments for bleeds, will be recorded in patient diaries. Adverse events will also be monitored and recorded throughout both study periods.

Key Inclusion Criteria

• 12 to 75 years of age, inclusive
• No clinically significant laboratory, ECG, or vital signs results
• Documented diagnosis consistent with VWD of any type
• Historical annualized bleeding rate (ABR; excluding menstrual bleeds and bleeds under the skin) of both untreated and treated bleeds ≥12 per year
• Patients with VWD who are judged by the investigator to be suitable candidates for routine prophylaxis to reduce the frequency of bleeding episodes
• Hemoglobin level ≥ 8 g/dL and platelet count ≥ 100 x 109/L at Screening

Key Exclusion Criteria

• Use of routine prophylaxis of VWF-containing concentrates defined as at least 1 VWF-containing concentrate infusion to prevent or reduce bleeding per week during the previous 6 months prior to screening
• Planning to initiate routine prophylaxis with VWF-containing concentrates or any other hemostatic treatment during the study
• Patients with pro-thrombotic disorders or abnormal findings on laboratory thrombophilia evaluation performed at screening or previously documented
• 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
• Baseline FVIII activity > lower limit of normal (LLN)

IPD will not be shared due to legal, ethical, or regulatory restrictions related to the study population or data use agreements.