Immune Tolerance Induction in Haemophilia A Patients Using Wilate or Nuwiq

Immune Tolerance Induction in Haemophilia A Patients Using Wilate or Nuwiq - A Canadian Study

Uncontrolled, multi-centre, non-interventional study with a prospective and a retrospective cohort, to evaluate the efficacy of Wilate or Nuwiq in achieving complete or partial immune tolerance induction (ITI) success in severe and moderate haemophilia A patients with inhibitors

Inclusion Criteria:

• Male patients of any age with moderate or severe haemophilia A.
• Patients with a first occurrence of inhibitors, inhibitors refractory to previous ITI attempt(s), or relapsed inhibitors to FVIII, with an inhibitor titre of ≥0.6 BU measured on 2 separate occasions at least 2 weeks apart.
• Informed written consent from the patient and/or the patient's parent(s) or legal guardian(s)

For patients in the prospective cohort:

• Patients who are currently on Wilate or Nuwiq ITI, have just initiated ITI, or are planned to initiate ITI treatment with Wilate or Nuwiq.

For patients in the retrospective cohort:

• Patients having received Wilate or Nuwiq ITI before entry into this study. Retrospective data will be collected for a maximum of 3 years before enrolment into the study. To be eligible, the following information is needed:
• Wilate or Nuwiq treatment details (start date, dose, treatment frequency, and dose change).
• Reliably documented bleeding frequency.
• FVIII inhibitor titres.
• FVIII half-life.
• FVIII IVR.

Exclusion Criteria:

Patients who meet any of the following criteria are not eligible for the study:

• Congenital or acquired bleeding disorders other than haemophilia A.
• A history of hypersensitivity to blood products and/or plasma-derived FVIII concentrates.
• Inability to speak/read English or French well enough to provide consent and adhere to the study.
• People who are receiving other non-factor therapies, e.g. concizumab