Gene Therapy Study in Severe Hemophilia a Patients with Antibodies Against AAV5

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Trial Status Terminated

Trial Identifier

NCT03520712

Condition

Hemophilia A, Hemophilia a, Gene Therapy, Clotting Disorders, Blood Disorder

The below information is taken directly from public registry websites such as ClinicalTrials.gov, EuClinicalTrials.eu, ISRCTN.com, etc. and has not been edited.

Trial Summary

This study is being conducted by BioMarin Pharmaceutical Inc. as an open label, single dose study to determine the safety of valoctocogene roxaparvovec (an Adenovirus-Associated Virus (AAV) based gene therapy vector) in severe Hemophilia A patients with pre-existing antibodies against AAV5.

Eligibility Criteria

Birth Sex

Male

Age

From 18 Years

Healthy Volunteers

No

Drug/Treatment:

Valoctocogene Roxaparvovec

Phase:

Phase 1/Phase 2

Study Type:

Interventional

Number of Participants:

3

Study Started:

2018-04-03

Study Updated:

2024-09-25

Trial Locations

  • Kyung Hee University Hospital at Gangdong

    Seoul, , Korea, Republic of

  • Severance Hospital, Yonsei University Health System

    Seoul, , Korea, Republic of

  • Charlotte Maxeke Johannesburg Academic Hospital, Hemophilia Comprehensive Care Center

    Johannesburg, , South Africa

  • Kaohsiung Medical University Chung-Ho Memorial Hospital

    Kaohsiung, , Taiwan

  • Taichung Veterans General Hospital

    Taichung, , Taiwan

  • National Taiwan University Hospital

    Taipei, , Taiwan

  • Tri-Service General Hospital

    Taipei, , Taiwan

  • Royal Free Hospital

    London, , United Kingdom

  • University Hospital Southampton NHS Foundation Trust

    Southampton, , United Kingdom

Inclusion Criteria

1. Males ≥ 18 years of age with hemophilia A and residual FVIII levels ≤ 1 IU/dL as evidenced by medical history, at the time of signing the informed consent.
2. Detectable pre-existing antibodies against the AAV5 vector capsid as measured by AAV5 total antibody ELISA.
3. Subject must have been on prophylactic FVIII replacement therapy for at least 12 months prior to study entry.
4. No previous documented history of a detectable FVIII inhibitor, and results from a Bethesda assay or Bethesda assay with Nijmegen modification of less than 0.6 Bethesda Units (BU) (or less than 1.0 BU for laboratories with a historical lower sensitivity cutoff for inhibitor detection of 1.0 BU) on 2 consecutive occasions at least one week apart within the past 12 months (at least one of which should be tested at the central laboratory).
5. Sexually active participants must agree to use an acceptable method of effective contraception. Participants must agree to contraception use for at least 12 weeks post-infusion.

Exclusion Criteria

1. Any evidence of active infection including COVID-19, or any immunosuppressive disorder, except for HIV infection. HIV positive patients who meet all other eligibility criteria may be included if they have a CD4 count > 200/mm3 and an undetectable viral load (unquantifiable viral load as defined as less than the limit of quantification by the testing laboratory’s assay is permitted) while receiving an antiretroviral therapy (ART) regimen that does not contain efavirenz or another potentially hepatotoxic ART.
2. Evidence of liver dysfunction as assessed by liver tests and most recent, prior FibroScan or liver biopsy showing significant fibrosis of 3 or 4 as rated on a scale of 0-4 on the Batts-Ludwig (Batts 1995) or METAVIR (Bedossa 1996) scoring systems, or an equivalent grade of fibrosis if an alternative scale is used.
3. Chronic or active hepatitis B or C as evidenced by testing at screening.
4. Active malignancy, except non-melanoma skin cancer, or history of hepatic malignancy.
5. Any condition that, in the opinion of the investigator or Sponsor would prevent the patient from fully complying with the requirements of the study (including corticosteroid treatment and/or use of alternative immunosuppressive agents outlined in the protocol) and/or would impact or interfere with evaluation and interpretation of subject safety or efficacy result

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