Clinical trial Recruiting at 36 sites Phase 3 Interventional Ages 18 and up Men only

Evaluating the safety and effectiveness of gene therapies for Hemophilia A and B

Official title: A PHASE 3, NON-INVESTIGATIONAL PRODUCT, MULTI COUNTRY COHORT STUDY TO DESCRIBE THE LONG-TERM SAFETY AND EFFECTIVENESS OF A PRIOR SINGLE-DOSE TREATMENT WITH INVESTIGATIVE GIROCTOCOGENE FITELPARVOVEC OR FIDANACOGENE ELAPARVOVEC IN PARTICIPANTS WITH HEMOPHILIA A OR HEMOPHILIA B, RESPECTIVELY

Run by Pfizer · NCT05568719 · Data updated 2026-11-12

This study is testing two gene therapies for Hemophilia A and B to see how safe and effective they are for patients who have already taken part in previous trials.

More Hemophilia A trials

Quick facts

PhasePhase 3
Study typeInterventional
Ages18 Years and up
SexMen only
Enrollment173 (estimated)
SponsorPfizer
Industry-sponsored
Locations39 sites (Rancho Cordova, California and 38 other locations)
StatusRecruiting
StartedDecember 28, 2022
Main results expectedFebruary 25, 2040
Study endsFebruary 25, 2040
Registry record updatedOctober 7, 2026
Trial IDNCT05568719 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are patients with Hemophilia A or B who have previously received investigational gene therapies in Pfizer-sponsored studies.

Probably not a fit

Patients who have not participated in prior Pfizer-sponsored studies involving these gene therapies may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This study investigates the long-term safety and efficacy of two gene therapies, giroctocogene fitelparvovec for Hemophilia A and fidanacogene elaparvovec for Hemophilia B, in patients who have previously participated in Pfizer-sponsored clinical trials. Participants will undergo regular assessments based on standard care protocols to monitor their health outcomes. The study aims to gather data on the integration of the adeno-associated virus vector in the liver and its impact on bleeding episodes.

Why it matters

Potential benefit: If successful, this study could significantly improve the management of Hemophilia A and B, potentially reducing bleeding episodes and enhancing patients' quality of life.

How similar studies have gone: Other studies involving gene therapies for hemophilia have shown promising results, indicating a potential for success in this approach.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

-Only participants who received investigational giroctocogene fitelparvovec or fidanacogene eleparvovec and were enrolled in a Pfizer-sponsored study (C0371002, C0371003, C0371005, C3731001, C3731003) are eligible.

Exclusion Criteria:

-None

Where it's running

  • The Regents of the University of California||UC Davis Health
    Rancho Cordova, California, United States
    Recruiting
  • UC Davis Health
    Sacramento, California, United States
    Recruiting
  • UC Davis Ambulatory Care Clinic
    Sacramento, California, United States
    Recruiting
  • UC Davis Hemophilia Treatment Center
    Sacramento, California, United States
    Recruiting
  • UC Davis Medical Center
    Sacramento, California, United States
    Recruiting
  • UCSF Outpatient Hematology Clinic
    San Francisco, California, United States
    Recruiting
Show 33 more locations
  • USF Health Morsani Center For Advanced Healthcare
    Tampa, Florida, United States
    Recruiting
  • The University of South Florida Board of Trustees
    Tampa, Florida, United States
    Recruiting
  • Innovative Hematology, Inc.
    Indianapolis, Indiana, United States
    Recruiting
  • Cornell University||Joan & Sanford I. Weill Medical College
    New York, New York, United States
    Recruiting
  • Weill Cornell Medical College-New York Presbyterian Hospital
    New York, New York, United States
    Recruiting
  • The Childrens Hospital of Philadelphia Division of Hematology
    Philadelphia, Pennsylvania, United States
    Recruiting
  • The Childrens Hospital of Philadelphia Division of Hematology
    Philadelphia, Pennsylvania, United States
    Recruiting
  • Washington Institute for Coagulation
    Seattle, Washington, United States
    Recruiting
  • Royal Prince Alfred Hospital
    Camperdown, New South Wales, Australia
    Recruiting
  • Sydney Local Health District (RPAH Zone)
    Camperdown, New South Wales, Australia
    Recruiting
  • The Alfred Hospital
    Melbourne, Victoria, Australia
    Recruiting
  • Unity Health Toronto, St. Michael's Hospital
    Toronto, Ontario, Canada
    Recruiting
  • Hospices Civils de Lyon - Hopital Louis Pradel
    Bron, Rhône, France
    Recruiting
  • Hôpital Universitaire Necker Enfants Malades
    Paris, France
    Recruiting
  • Universitätsklinikum Bonn
    Bonn, North Rhine-Westphalia, Germany
    Recruiting
  • General Hospital of Athens Laiko
    Athens, Greece
    Recruiting
  • Nagoya University Hospital
    Nagoya, Aichi-ken, Japan
    Recruiting
  • Sapporo Tokushukai Hospital
    Sapporo, Hokkaido, Japan
    Recruiting
  • Saitama Medical University Hospital
    Iruma-gun, Saitama, Japan
    Recruiting
  • Kyung Hee University Hospital at Gangdong
    Seoul, South Korea
    Recruiting
  • Hospital Universitario Rio Hortega
    Valladolid, Spain
    Recruiting
  • Skåne University Hospital
    Malmö, Sweden
    Recruiting
  • Changhua Christian Hospital
    Changhua, Taiwan
    Recruiting
  • Chung-Ho Memorial Hospital, Kaohsiung Medical University
    Kaohsiung City, Taiwan
    Recruiting
  • Taichung Veterans General Hospital
    Taichung, Taiwan
    Recruiting
  • National Taiwan University Hospital
    Taipei, Taiwan
    Recruiting
  • Ege Universitesi Hastanesi
    Izmir, İ̇zmir, Turkey (Türkiye)
    Recruiting
  • Acibadem Adana Hospital
    Adana, Turkey (Türkiye)
    Recruiting
  • Gaziantep Universitesi Sahinbey Arastirma ve Uygulama Hastanesi
    Gaziantep, Turkey (Türkiye)
    Recruiting
  • İstanbul Üniversitesi Onkoloji Enstitüsü
    Istanbul, Turkey (Türkiye)
    Recruiting
  • Mississippi Center For Advanced Medicine
    Madison, Mississippi, United States
    Terminated
  • King Faisal Specialist Hospital and Research Center
    Riyadh, Saudi Arabia
    Not yet recruiting
  • Chung Shan Medical University Hospital
    Taichung, Taiwan
    Not yet recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.