A Study of Bleeding and Treatment in Participants With Von Willebrand Disease

This is a prospective, screening study in participants with confirmed Type 1 VWD according to diagnostic guidelines. Participants with confirmed Type 1 VWD and associated bleeding symptoms will be enrolled. The study may also be opened to participants with Type 2 and Type 3 VWD with Sponsor approval. Up to a total of 200 participants may be enrolled in the study.

The study includes screening, a baseline evaluation, and an approximately 4 month observation period which will include every other week telemedicine check-ins (to monitor bleed diary entries and bleeding event treatments. There will be an optional extension to the observation period of up to a total of 12 months for participants wishing to continue.

Inclusion criteria

• Has the ability to provide informed consent to participate in the study, in accordance with applicable regulations.
• Has an understanding, ability, and willingness to comply with Study procedures and restrictions.
• Is 16 years and < 70 years at the time of screening.
• Weight 50 to 120 kg (±10%) at Screening and body mass index (BMI) <38.5 kg/m*2.
• Has Von Willebrand Disease: Type 1 VWD (including Type 1C VWD) or Type 2A VWD. All participants must have: Documented lab results confirming their diagnosis consistent with ISTH/ASH diagnostic guidelines; VWF Activity ≤30 IU/dL and FVIII activity ≤70 IU/dL during Screening.
• Has symptomatic disease as defined by a history of bruising or bleeding events, with an expected minimum of 3 bleeding episodes (including heavy menstrual bleeding) per year that require treatment to control bleeding symptoms, and/or has recurrent and ongoing episodes of heavy menstrual bleeding at the time of enrollment.

Exclusion criteria

• Has a history of clinically significant hypersensitivity associated with monoclonal antibody therapies.
• Has a personal history of venous or arterial thrombosis or thromboembolic disease, except for catheter-associated, superficial vein thrombosis events.
• Has a high-risk thrombophilia: Homozygous Factor V Leiden (FVL), compound heterozygous FVL/prothrombin gene mutation, antithrombin <50%, congenital protein C and protein S deficiency with levels <50%.
• Requires ongoing hemostatic (bleed-prophylaxis) treatment to prevent bleeding
• Has other known severe bleeding disorder(s) other than VWD.
• Planned major surgery during the study period.
• Has other conditions that substantially increase the risk of thrombosis either individually or in combination, at the discretion of the Investigator, including but not limited to: significant family history; BMI >30 and ≤38.5 kg/m² (moderately obese, adjusted for ethnicity and increased central adiposity); reduced mobility; active malignancy; major surgery within 6 weeks preceding Screening; or postpartum within 12 weeks preceding Screening.
• Is pregnant or plans to become pregnant within the next 6 months following informed consent sign off.
• Has clinically significant cardiovascular disease including, but not limited to: NYHA Class III or IV heart failure, coronary artery disease, uncontrolled arrythmia, moderate to severe valvular heart disease, peripheral vascular disease, and ischemic stroke.
• Has other combinations of conditions that substantially increase the risk of cardiovascular events at the discretion of the Investigator including, but not limited to, smoking, uncontrolled hyperlipidemia, and uncontrolled hypertension.
• Has any concurrent disease, treatment, medication (including but not limited to ongoing anticoagulation, antiplatelet therapy, or non-steroidal anti-inflammatory drugs or other drugs that affect hemostasis), condition, medication, or abnormality in clinical laboratory tests which may impact on the participant's bleeding symptoms or affect their ability to complete the study, in the Investigator's opinion.
• Has received any investigational product within 30 days prior to Screening. If the participant was enrolled and dosed in Velora Pioneer (study HMB-002-102; NCT06754852), they must have completed their End of Study Visit.