Study of the Efficacy and Safety PF-06741086 in Adult and Teenage Participants With Severe Hemophilia A or Moderately Severe to Severe Hemophilia B

  • End date
    Aug 12, 2023
  • participants needed
  • sponsor
Updated on 26 September 2021
treatment regimen
replacement therapy
Factor VIII
coagulation factor
severe haemophilia a
antihemophilic factor
acute hemorrhage
acute bleeding


Treatment with PF-06741086 is anticipated to demonstrate a clinically relevant advantage and/or a major contribution to patient care in comparison to current methods of treatment for hemophilia A or B because it works differently than factor replacement products and will work in the presence of inhibitors. The potential for once weekly (QW) subcutaneous (SC) administration provides for treatment options in the absence of reliable vascular access, increased convenience and may enable better compliance. Combined, these qualities should result in a reduction of bleeding episodes.

Condition Hemophilia A, Factor IX Deficiency, Hemophilia, christmas disease, hema
Treatment PF-06741086
Clinical Study IdentifierNCT03938792
Last Modified on26 September 2021


Yes No Not Sure

Inclusion Criteria

Participants with a diagnosis of severe hemophilia A or moderately severe to severe hemophilia B with a minimum weight of 35 kg at screening
Participant or legally authorized representative, or participant's caregiver capable of giving signed informed consent (or minor assent, when applicable)
Participants who are enrolled into the Non-Inhibitor Cohort must also meet the
No detectable or documented history of inhibitors
Participants on FVIII/FIX routine prophylaxis who have demonstrated at least 80% compliance with scheduled prophylaxis regimen during 6 months prior to enrollment and are willing to continue to receive routine prophylaxis treatment with FVIII/FIX replacement during the Observational Phase
Participants with on-demand treatment regimen with 6 acute bleeding episodes (spontaneous or traumatic) that required coagulation factor infusion during the 6 months period prior to enrollment and willing to continue to receive on demand treatment during the Observational Phase
Participants who are enrolled into the Inhibitor Cohort must also meet the
Documentation of current high titer inhibitor (5 BU/mL) or current low titer inhibitor (<5 BU/mL) refractory to FVIII or FIX replacement and with FVIII or FIX recovery <60% of expected within previous 6 months prior to enrolment into the Observational Phase
Hemophilia A participants with on-demand treatment regimen with 6 bleeding episodes or hemophilia B participants with 4 bleeding episodes (spontaneous or traumatic) necessitating treatment with bypass factor during the 6 months prior to Enrollment into Observational Phase and willing to continue to receive on-demand treatment during the Observational Phase
Participants who have documented inhibitors while on factor-replacement therapy but who do not meet the quantitative inhibitor criteria described in the prior bullet at the time of Screening (eg, participant with a previously documented high-titer inhibitor (5 BU/mL) and whose condition precludes re-challenge with FVIII or FIX replacement) may be considered for eligibility on a case-by-case basis with prior agreement from the Pfizer Medical Monitor
Participants who meet the bleeding criteria noted above and who are on routine prophylaxis (defined as treatment by IV injection of bypass factor to prevent bleeding) and have demonstrated at least 80% compliance with scheduled prophylaxis regimen during the 6 months prior to enrollment, may be considered for eligibility on a case-by-case basis with discussion and agreement from the Pfizer medical monitor

Exclusion Criteria

Previous or current treatment for and/or history of coronary artery diseases, venous or arterial thrombosis or ischemic disease
Known planned surgical procedure during the planned study period
Known hemostatic defect other than hemophilia A or B
Abnormal renal or hepatic function
Current unstable liver or biliary disease
Abnormal hematologic parameters
Other acute or chronic medical or psychiatric condition or laboratory abnormality that may increase the risk associated with study participation or investigational product administration or may interfere with the interpretation of study results and, in the judgment of the investigator
Regular, concomitant therapy with immunomodulatory drugs
Current routine prophylaxis with bypassing agent or non-coagulation non-factorreplacement therapy, or any previous treatment with a gene therapy product for treatment of hemophilia (participants treated with prophylaxis using bypassing agents or who had prior treatment with non-factor products may be considered on a case-by-case basis)
Ongoing or planned use of immune tolerance induction during the Observational Phase or Active Treatment Phase, or prophylaxis with FVIII or FIX replacement at any time after initiation of treatment with study intervention during the Active Treatment Phase
Previous exposure to PF 06741086 during participation in studies B7841002 and B7841003
CD4 cell count 200/uL if human immunodeficiency virus (HIV)-positive
Participation in other studies involving investigational drug(s) or investigational vaccines within 30 days (or as determined by local requirements) or 5 half-lives prior to study entry and/or during study participation
Screening ECG that demonstrates clinically relevant abnormalities that may affect participant safety or interpretation of study results
Individuals with hypersensitivity or an allergic reaction to hamster protein or other components of the study intervention
Investigator site staff members directly involved in the conduct of the study and their family members, site staff members otherwise supervised by the investigator, or participants who are Pfizer employees, including their family members, directly involved in the conduct of the study
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