NCT04083781

Research Study to Look at How Well the Drug Concizumab Works in Your Body if You Have Haemophilia With Inhibitors

Efficacy and Safety of Concizumab Prophylaxis in Patients With Haemophilia A or B With Inhibitors

• Status: Active Not Recruiting
• Phase: Phase 3
• Study type: Interventional
• Enrollment: 134 (actual)
• Sponsor: Novo Nordisk A/S · Industry
• Sex: Male
• Age: —
• Healthy volunteers: Not accepted

Summary

This study will test how well a new medicine called concizumab works in the body of people with haemophilia A or B with inhibitors. The purpose is to show that concizumab can prevent bleeds in the body and is safe to use. Participants who usually only take medicine to treat bleeds (on-demand) will be placed in one of two groups. In one group, participants will get study medicine from the start of the study. In the other group, participants will continue with their normal medicine and get study medicine after 6 months. Which treatment the participant gets is decided by chance. Participants who usually take medicine to prevent bleeds (prophylaxis treatment) or who are already being treated with concizumab (study medicine) will receive the study medicine from the start of the study. Participants will get 1 injection with the study medicine every day under the skin. This participants will have to do themselves and can be done at home. The study doctor will hand out the medicine in the form of a pen-injector. The pen-injector will contain the study medicine. The study will last for about seven years. The length of time the participants will be in the study depends on when they agreed to take part or when the medicine is available for purchase in their country (31 December 2026 at the latest). The time between visits will be approximately 4 weeks for the first 6 to 12 months, depending on the group participants are in and approximately 8 weeks for the rest of the study. Participants will be asked to record information into an electronic diary during the study and may also be asked to wear an activity tracker.

Conditions

• Haemophilia A With Inhibitors
• Haemophilia B With Inhibitors

Interventions

Type	Name	Description
DRUG	Concizumab	Concizumab will be administered daily subcutaneously (s.c., under the skin). When patients are randomised to concizumab prophylaxis they will receive a loading dose of 1.0 mg/kg concizumab at visit 2a (week 0: arm 2, 3 \& 4) or visit 9a (week 24: arm 1) followed by an initial daily dose of 0.20 mg/kg concizumab from treatment day 2. Within an initial 5-8-week dose adjustment period on 0.20 mg/kg concizumab, the patients can be increased or decreased in dose to 0.25 mg/kg or 0.15 mg/kg concizumab. A potential dose adjustment will take place at visit 4a.1 (week 6: arm 2, 3 \& 4) or 9a.3 (week 30: arm 1) and will be based on the concizumab exposure level measured at the previous visit 4a (week 4) or 9a.2 (week 28). Patients who have concizumab exposure levels of 200-4000 ng/mL will stay at 0.20 mg/kg concizumab. Patients in arm 1 will continue on-demand treatment with their usual bypassing product until visit 9a (week 24: end of main part for arm 1).

Timeline

• Start date: 2019-10-21
• Primary completion: 2021-12-27
• Completion: 2027-02-21
• First posted: 2019-09-10
• Last updated: 2026-03-24
• Results posted: 2025-04-27

Locations

99 sites across 29 countries: United States, Algeria, Australia, Austria, Bulgaria, Canada, Croatia, Czechia, Denmark, France, India, Italy, Japan, Malaysia, Mexico, Norway, Poland, Portugal, Russia, Serbia, Slovakia, South Africa, South Korea, Spain, Sweden, Thailand, Turkey (Türkiye), Ukraine, United Kingdom

Regulatory

• FDA-regulated drug study