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Xyntha

Phase 3

Hemophilia A | Monoclonal antibody | Hematology |Pfizer, Inc.|Last Updated: Jun 12, 2025

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
UNCONTROLLED
Total Trials1
Total Enrollment53
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT00868530Study Evaluating On-Demand Treatment Of Xyntha In Chinese SubjectsPHASE3 COMPLETED 53Sep 1, 2008Dec 1, 2009Jun 12, 20256 China
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Study Endpoints
Primary Endpoints
Investigator Hemostatic Efficacy Assessment 8 Hours Post Infusion
8 hours post infusion

The Investigator Hemostatic Efficacy Assessment was based on a 4-point rating scale (Excellent = 1: definite pain relief or improvement in signs of bleeding, with no additional infusion, Good = 2: definite pain relief or improvement in signs of bleeding, Moderate = 3: probable or slight improvement, No Response = 4: no improvement at all between infusions).

Investigator Hemostatic Efficacy Assessment 24 Hours Post Infusion
24 hours post infusion

The Investigator Hemostatic Efficacy Assessment was based on a 4-point rating scale (Excellent = 1: definite pain relief or improvement in signs of bleeding, with no additional infusion, Good = 2: definite pain relief or improvement in signs of bleeding, Moderate = 3: probable or slight improvement, No Response = 4: no improvement at all between infusions).

Number of Participants With Factor VIII (FVIII) Inhibitor Development
Day 1 and Month 6 or Early Termination Visit

Incidence of FVIII inhibitor was defined as any result determined as positive at local laboratory, and confirmed at central laboratory. Incidence was stratified by participant exposure history: Minimally Treated Patients (MTPs): those who had received at least 1 prior FVIII infusion, and \<= 100 documented Exposure Days (EDs), while Previously Treated Patients (PTPs): those who had received \>100 documented prior EDs. When number of prior EDs for an individual was not known to be at least 100, participants were included in the MTP population.

Secondary Endpoints
FVIII Recovery : Change From Baseline in FVIII Concentration
Day 1 and Month 6 or Early Termination Visit
Number of Participants With Less Than Expected Therapeutic Effect (LETE)
24 hours after each of 2 successive infusion, up to 6 months
Number of Participants With Thrombosis Allergic-Type Reactions
Baseline up to 6 months
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Study Design & Arms
AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
XynthaEXPERIMENTALThis trial was an open-label and included assessments of safety, clinical efficacy, and Factor VIII (FVIII) recovery in Chinese subjects with hemophilia A. Subjects received on-demand treatments with Xyntha over a 6-month (calendar day) period.
Interventions
NameTypeDescription
XynthaBIOLOGICALXyntha for on-demand treatment of bleeding episodes were according to investigator prescription during the 6 months observation period. The recovery assessed by determining the Factor VIII (FVIII) concentration (FVIII:C) levels in individual subjects at the initial and final visits. The dose of Xyntha for recovery assessments is: single 50 IU/kg (±5 IU/kg) IV bolus infusion. All Xyntha administrations occurred in the clinic (hospital).
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Eligibility Criteria
Age Range6 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites6

Inclusion Criteria: * Subjects equal or more than 6 years of age with mild, moderate or severe hemophilia A (FVIII activity: more than 5%, 1-5%, or less than 1%, respectively) * Subjects with previous exposure to FVIII replacement therapy * If human immunodeficiency virus (HIV) positive, documented...

Countries:China
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