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Standard of Care FIX Replacement therapy

Phase 3

Hemophilia B | Small molecule | Hematology |Pfizer, Inc.|Last Updated: Nov 6, 2025

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment212

FDA Designations

No designations recorded

Clinical trial landscape

Standard of Care FIX Replacement therapy · 1 trial · 2 indications

Phase 3 1
NCT03587116A Study to Evaluate Prospective Efficacy and Safety Data of Current FIX Prophylaxis Replacement Therapy in Adult Hemophilia B Subjects (FIX:C≤2%) or Current FVIII Prophylaxis Replacement Therapy in Adult Hemophilia A Subjects (FVIII:C≤1%)Hemophilia B
COMPLETED212 Analytics
PHASE3COMPLETED
A Study to Evaluate Prospective Efficacy and Safety Data of Current FIX Prophylaxis Replacement Therapy in Adult Hemophilia B Subjects (FIX:C≤2%) or Current FVIII Prophylaxis Replacement Therapy in Adult Hemophilia A Subjects (FVIII:C≤1%)
Hemophilia BUnlock trial analytics

Study Endpoints

Primary Endpoints

Annualized Bleeding Rate (ABR) for Treated Bleeds and All Bleeds During Prospective Data Collection Period in Hemophilia B Participants: Efficacy Analysis Set
During prospective data collection period (from baseline visit of the study [Day 1] up to end of study follow-up [maximum follow-up: 1269 days])

ABR per participant was calculated as number of bleeds over number of days from baseline visit (Day 1 of the study) to end of study multiplication(\*)365.25 days. All bleeds included treated and untreated bleeds. A treated bleed was defined as an event necessitating administration of coagulation factor within 72 hours of signs or symptoms of bleeding. An untreated bleed was defined as an event not necessitating administration of coagulation factor within 72 hours of signs or symptoms of bleeding. In this outcome measure, ABR for all and treated bleeds during prospective data collection period in hemophilia B participants per efficacy analysis set was reported. Abbreviations used: AAV6 = adeno-associated virus 6; AAV-Spark100 = Bioengineered AAV capsid, derived from a naturally occurring AAV serotype; nAb = neutralizing antibodies.

ABR for Treated Bleeds and All Bleeds During Prospective Data Collection Period in Hemophilia B Participants: Per-protocol Analysis Set
During prospective data collection period (from baseline visit of the study [Day 1] up to end of study follow-up [maximum follow-up: 1269 days])

ABR per participant was calculated as number of bleeds over number of days from baseline visit (Day 1 of the study) to end of study\*365.25 days. All bleeds included treated and untreated bleeds. A treated bleed was defined as an event necessitating administration of coagulation factor within 72 hours of signs or symptoms of bleeding. An untreated bleed was defined as an event not necessitating administration of coagulation factor within 72 hours of signs or symptoms of bleeding. In this outcome measure, ABR for all and treated bleeds during prospective data collection period in hemophilia B participants per protocol analysis set was reported.

ABR for Treated Bleeds and All Bleeds During Prospective Data Collection Period in Hemophilia B Participants: Protocol Amendment 5 Analysis Set
During prospective data collection period (from baseline visit of the study [Day 1] up to end of study follow-up [maximum follow-up: 1269 days])

ABR per participant was calculated as number of bleeds over number of days from baseline visit (Day 1 of the study) to end of study\*365.25 days. All bleeds included treated and untreated bleeds. A treated bleed was defined as an event necessitating administration of coagulation factor within 72 hours of signs or symptoms of bleeding. An untreated bleed was defined as an event not necessitating administration of coagulation factor within 72 hours of signs or symptoms of bleeding. In this outcome measure, ABR for all and treated bleeds during prospective data collection period in hemophilia B participants per protocol amendment 5 analysis set was reported.

ABR for Treated Bleeds and All Bleeds During Retrospective Data Collection Period in Hemophilia B Participants: Protocol Amendment 5 Analysis Set
During retrospective data collection period (12 months before screening collected in the hemophilia history case report form [CRF])

ABR per participant was calculated as number of bleeds over number of days from baseline visit (Day 1 of the study) to end of study\*365.25 days. All bleeds included treated and untreated bleeds. A treated bleed was defined as an event necessitating administration of coagulation factor within 72 hours of signs or symptoms of bleeding. An untreated bleed was defined as an event not necessitating administration of coagulation factor within 72 hours of signs or symptoms of bleeding. In this outcome measure, ABR for all and treated bleeds during retrospective data collection period in hemophilia B participants per protocol amendment 5 analysis set was reported.

ABR for Treated Bleeds and All Bleeds From the Combined Retrospective and Prospective Data Collection Period in Hemophilia B Participants: Protocol Amendment 5 Analysis Set
From start of retrospective data collection period (12 months before screening collected in hemophilia history CRF) up to end of prospective data collection follow-up of period (maximum follow-up:1269 days), for a total of approximately 4.5 years

ABR per participant was calculated as number of bleeds over number of days from baseline visit (Day 1 of the study) to end of study\*365.25 days. All bleeds included treated and untreated bleeds. A treated bleed was defined as an event necessitating administration of coagulation factor within 72 hours of signs or symptoms of bleeding. An untreated bleed was defined as an event not necessitating administration of coagulation factor within 72 hours of signs or symptoms of bleeding. In this outcome measure, ABR for all and treated bleeds during retrospective and prospective data collection period in hemophilia B participants per protocol amendment 5 analysis set was reported.

ABR for Treated Bleeds and All Bleeds During Prospective Data Collection Period in Hemophilia A Participants: Efficacy Analysis Set
During prospective data collection period (from baseline visit of the study [Day 1] up to end of study follow-up [maximum follow-up: 948 days])

ABR per participant was calculated as number of bleeds over number of days from baseline visit (Day 1 of the study) to end of study\*365.25 days. All bleeds included treated and untreated bleeds. A treated bleed was defined as an event necessitating administration of coagulation factor within 72 hours of signs or symptoms of bleeding. An untreated bleed was defined as an event not necessitating administration of coagulation factor within 72 hours of signs or symptoms of bleeding. In this outcome measure, ABR for all and treated bleeds during prospective data collection period in hemophilia A participants per efficacy analysis set was reported.

ABR for Treated Bleeds and All Bleeds During Prospective Data Collection Period in Hemophilia A Participants: Per-protocol Analysis Set
During prospective data collection period (from baseline visit of the study [Day 1] up to end of study follow-up [maximum follow-up: 948 days])

ABR per participant was calculated as number of bleeds over number of days from baseline visit (Day 1 of the study) to end of study\*365.25 days. All bleeds included treated and untreated bleeds. A treated bleed was defined as an event necessitating administration of coagulation factor within 72 hours of signs or symptoms of bleeding. An untreated bleed was defined as an event not necessitating administration of coagulation factor within 72 hours of signs or symptoms of bleeding. In this outcome measure, ABR for all and treated bleeds during prospective data collection period in hemophilia A participants per protocol analysis set was reported.

ABR for Treated Bleeds and All Bleeds During Prospective Data Collection Period in Hemophilia A Participants: Protocol Amendment 5 Analysis Set
During prospective data collection period (from baseline visit of the study [Day 1] up to end of study follow-up [maximum follow-up: 948 days])

ABR per participant was calculated as number of bleeds over number of days from baseline visit (Day 1 of the study) to end of study\*365.25 days. All bleeds included treated and untreated bleeds. A treated bleed was defined as an event necessitating administration of coagulation factor within 72 hours of signs or symptoms of bleeding. An untreated bleed was defined as an event not necessitating administration of coagulation factor within 72 hours of signs or symptoms of bleeding. In this outcome measure, ABR for all and treated bleeds during prospective data collection period in hemophilia A participants per protocol amendment 5 analysis set was reported.

ABR for Treated Bleeds and All Bleeds During Retrospective Data Collection Period in Hemophilia A Participants: Protocol Amendment 5 Analysis Set
During retrospective data collection period (12 months before screening collected in the hemophilia history CRF)

ABR per participant was calculated as number of bleeds over number of days from baseline visit (Day 1 of the study) to end of study\*365.25 days. All bleeds included treated and untreated bleeds. A treated bleed was defined as an event necessitating administration of coagulation factor within 72 hours of signs or symptoms of bleeding. An untreated bleed was defined as an event not necessitating administration of coagulation factor within 72 hours of signs or symptoms of bleeding. In this outcome measure, ABR for all and treated bleeds during retrospective data collection period in hemophilia A participants per protocol amendment 5 analysis set was reported.

ABR for Treated Bleeds and All Bleeds From the Combined Retrospective and Prospective Data Collection Period in Hemophilia A Participants: Protocol Amendment 5 Analysis Set
From start of retrospective data collection period (12 months before screening collected in hemophilia history CRF) up to end of prospective data collection follow-up of period (maximum follow-up:948 days), for a total of approximately 3.6 years

ABR per participant was calculated as number of bleeds over number of days from baseline visit (Day 1 of the study) to end of study\*365.25 days. All bleeds included treated and untreated bleeds. A treated bleed was defined as an event necessitating administration of coagulation factor within 72 hours of signs or symptoms of bleeding. An untreated bleed was defined as an event not necessitating administration of coagulation factor within 72 hours of signs or symptoms of bleeding. In this outcome measure, ABR for all and treated bleeds during retrospective and prospective data collection period in hemophilia A participants per protocol amendment 5 analysis set was reported.

Secondary Endpoints

Annualized Infusion Rate (AIR) During Prospective Data Collection Period in Hemophilia B Participants: Efficacy Analysis Set
During prospective data collection period (from baseline visit of the study [Day 1] up to end of study follow-up [maximum follow-up: 1269 days])
AIR During Prospective Data Collection Period in Hemophilia B Participants: Per-protocol Analysis Set
During prospective data collection period (from baseline visit of the study [Day 1] up to end of study follow-up [maximum follow-up: 1269 days])
AIR During Prospective Data Collection Period in Hemophilia B Participants: Protocol Amendment 5 Analysis Set
During prospective data collection period (from baseline visit of the study [Day 1] up to end of study follow-up [maximum follow-up: 1269 days])
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeOTHER

Treatment Arms

ArmTypeDescription
Standard of Care FIX replacement therapyOTHER -
Standard of Care FVIII replacement therapyOTHER -

Interventions

NameTypeDescription
Standard of Care FIX Replacement therapyDRUGThere is no investigational product being administered. Subjects will be administering their own standard of care FIX replacement therapy.
Standard of Care FVIII Replacement therapyDRUGThere is no investigational product being administered. Subjects will be administering their own standard of care FVIII replacement therapy.
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Eligibility Criteria

Age Range18 Years to 64 Years
SexMALE
Healthy VolunteersNo
Study Sites75

Inclusion Criteria: Hemophilia B Population: 1. Evidence of a signed and dated informed consent document indicating that the participant has been informed of all pertinent aspects of the study. 2. Willing and able to comply with scheduled visits, FIX prophylaxis treatment plan, laboratory tests an...

Countries:United StatesAustraliaBelgiumBrazilCanadaFranceGermanyGreeceIsraelItalyJapanSaudi ArabiaSouth KoreaSpainSwedenTaiwanTurkey (Türkiye)United Kingdom
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Frequently asked questions about Standard of Care FIX Replacement therapy

What is Standard of Care FIX Replacement therapy used for?

Standard of Care FIX Replacement therapy is used for hemophilia B, a bleeding disorder caused by a deficiency of clotting factor IX. It is an investigational replacement therapy being studied in adult patients with hemophilia B and factor IX levels of 2% or less. The therapy is intended to provide the missing clotting factor to help prevent bleeding episodes.

Who makes Standard of Care FIX Replacement therapy?

Standard of Care FIX Replacement therapy is being developed by Pfizer, Inc., a biopharmaceutical company traded on the New York Stock Exchange under the ticker symbol PFE. Pfizer is conducting clinical research to evaluate the efficacy and safety of this factor IX replacement therapy in patients with hemophilia B.

What phase is Standard of Care FIX Replacement therapy in?

Standard of Care FIX Replacement therapy is in Phase 3 clinical development. It is an investigational therapy, meaning it has not yet been approved by regulatory authorities. The Phase 3 study has been completed, and the therapy remains under evaluation for its efficacy and safety in adult patients with hemophilia B.

What clinical trials is Standard of Care FIX Replacement therapy in?

Standard of Care FIX Replacement therapy was studied in a Phase 3 clinical trial registered as NCT03587116. This completed study evaluated prospective efficacy and safety data of current factor IX prophylaxis replacement therapy in adult hemophilia B subjects with factor IX levels of 2% or less. The trial enrolled 212 male participants aged 18 years and older across multiple countries.

Is Standard of Care FIX Replacement therapy the same as factor IX replacement therapy?

Standard of Care FIX Replacement therapy is a factor IX replacement therapy. The term FIX refers to clotting factor IX, and the therapy is designed to replace this deficient clotting factor in patients with hemophilia B. It is administered as prophylaxis to prevent bleeding episodes in adult patients with severe or moderately severe hemophilia B.