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PF-06741086

Phase 3

Hemophilia A | Small molecule | Hematology |Pfizer, Inc.|Last Updated: Aug 14, 2026

Target and mechanism

Molecular targetTFPI
Target classProtein
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLEDDMC
Total Trials2
Total Enrollment433

FDA Designations

No designations recorded

Clinical trial landscape

PF-06741086 · 6 trials · 5 indications

Phase 3 2Phase 2 2Phase 1 2
NCT05145127Open-Label Extension Study of Marstacimab in Hemophilia Participants With or Without InhibitorsHemophilia A
RECRUITING245 Analytics
NCT03938792Study of the Efficacy and Safety PF-06741086 in Adult and Teenage Participants With Severe Hemophilia A or Moderately Severe to Severe Hemophilia BHemophilia A
COMPLETED188 Analytics
PHASE3RECRUITING
Open-Label Extension Study of Marstacimab in Hemophilia Participants With or Without Inhibitors
Hemophilia AUnlock trial analytics
PHASE3COMPLETED
Study of the Efficacy and Safety PF-06741086 in Adult and Teenage Participants With Severe Hemophilia A or Moderately Severe to Severe Hemophilia B
Hemophilia AUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of subject reporting Adverse Events
Baseline up to 7 years
Number of subjects reporting Serious Adverse Events
Baseline up to 7 years
Incidence and severity of thrombotic events
Baseline up to 7 years
Incidence and severity of thrombotic microangiopathy
Baseline up to 7 years
Number of subjects reporting Disseminated intravascular coagulalopathy/consumption coagulopathy
Baseline up to 7 years
Incidence of clinically significant persistent NAb against marstacimab
Baseline up to 7 years
Incidence and severity of injection site reaction
Baseline up to 7 years
Clinically significant changes in vital signs from baseline
Baseline up to 7 years
Incidence of clinically significant laboratory value abnormalities
Baseline up to 7 years
Incidence of severe hypersensitivity and anaphylactic reactions
Baseline up to 7 years
Model-Based Annualized Bleeding Rate (ABR) of Treated Bleeding Events: Inhibitor Cohort (Participants With Prior OD Therapy at OP)
OP reporting group: Up to 6 months; ATP reporting group: up to 12 months

ABR is defined as number of bleeding episodes per year. ABR was calculated as number of bleeds requiring treatments/ (days on treatment period/365.25). If a participant did not complete a treatment period, days on treatment ended at last dosing date + 6 days. Treated bleed: If a bleed was treated with factor replacement or bypass agents within 48 hours of start of bleeding, regardless of the type of treatment (preventive, prophylaxis or OD medication). A model-based ABR using a repeated measures negative binomial model is reported for this outcome measure.

Model-Based ABR of Treated Bleeding Events: Non-Inhibitor Cohort (Participants With Prior OD Therapy at OP)
OP reporting group: Up to 6 months; ATP reporting group: up to 12 months

ABR is defined as number of bleeding episodes per year. ABR was calculated as number of bleeds requiring treatments/ (days on treatment period/365.25). If a participant did not complete a treatment period, days on treatment ended at last dosing date + 6 days. Treated bleed: If a bleed was treated with factor replacement or bypass agents within 48 hours of start of bleeding, regardless of the type of treatment (preventive, prophylaxis or OD medication). A model-based ABR using a repeated measures negative binomial model is reported for this outcome measure.

Model-Based ABR of Treated Bleeding Events: Non-Inhibitor Cohort (Participants With RP at OP)
OP reporting group: Up to 6 months; ATP reporting group: up to 12 months

ABR is defined as number of bleeding episodes per year. ABR was calculated as number of bleeds requiring treatments/ (days on treatment period/365.25). If a participant did not complete a treatment period, days on treatment ended at last dosing date + 6 days. Treated bleed: If a bleed was treated with factor replacement or bypass agents within 48 hours of start of bleeding, regardless of the type of treatment (preventive, prophylaxis or OD medication). A model-based ABR using a repeated measures negative binomial model is reported for this outcome measure.

Number of Participants With Adverse Events (AEs): Inhibitor and Non-Inhibitor Cohort
OP reporting group: Up to 6 months; ATP reporting group: up to 13 months (includes 28-35 days of safety follow-up post last dose of study drug)

An AE was any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. AEs included both serious AEs and all other AEs.

Number of Participants With Serious Adverse Events (SAEs): Inhibitor and Non-Inhibitor Cohort
OP reporting group: Up to 6 months; ATP reporting group: up to 13 months (includes 28-35 days of safety follow-up post last dose of study drug)

AE: any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. SAE: any untoward medical occurrence at any dose that resulted in any of the following outcomes: death; life-threatening; required inpatient hospitalization or prolongation of existing hospitalization; persistent or significant disability/incapacity; congenital anomaly/birth defect; or that was considered as an important medical event.

Number of Participants With Thrombotic Events: Inhibitor and Non-Inhibitor Cohort
OP reporting group: Up to 6 months; ATP reporting group: up to 13 months (includes 28-35 days of safety follow-up post last dose of study drug)

Thrombotic events are when a blood clot (thrombus) forms in a blood vessel in the arm, leg, lung, or head and can be life-threatening. A thrombus can occur in veins (venous thrombosis) or arteries (arterial thrombosis).

Number of Participants With Thrombotic Microangiopathy: Inhibitor and Non-Inhibitor Cohort
OP reporting group: Up to 6 months; ATP reporting group: up to 13 months (includes 28-35 days of safety follow-up post last dose of study drug)

Thrombotic microangiopathy: pathological state where micro-vessels are occluded by platelet rich thrombi leading to thrombocytopenia (low platelets) and microangiopathic haemolytic anaemia (red blood cell destruction) and potential end organ damage.

Number of Participants With Disseminated Intravascular Coagulation/ Consumption Coagulopathy: Inhibitor and Non-Inhibitor Cohort
OP reporting group: Up to 6 months; ATP reporting group: up to 13 months (includes 28-35 days of safety follow-up post last dose of study drug)

Disseminated intravascular coagulation is characterized by widespread clotting in small blood vessels, and consumption of platelets and clotting factors by the clots, leading to bleeding.

Number of Participants With Anti-drug Antibodies (ADA) and Neutralizing Antibodies (NAb) Against PF- 06741086: Inhibitor and Non-Inhibitor Cohort
During prophylaxis treatment in ATP (12 months)

ADA positive: A participant with \>=1 treatment induced or treatment-boosted ADA response. NAb positive: An ADA positive participant with \>=1 treatment induced or treatment boosted NAb response.

Number of Participants With Transient and Persistent ADA and NAb Against PF-06741086: Inhibitor and Non-Inhibitor Cohort
During prophylaxis treatment in ATP (12 months)

Persistent ADA: participant with treatment-induced or treatment-boosted ADA detected at 2 or more times during treatment including any follow-up, where first and last ADA positive samples separated by \>=16 weeks. Transient ADA: treatment-induced or treatment-boosted ADA detected at only 1 time during treatment or follow-up. Persistent NAb: NAb-positive participant with first and last positive NAb samples detected \>=16 weeks posttreatment, irrespective of any negative samples in between. Transient NAb: NAb-positive participant with (1) treatment-induced/treatment-boosted NAb sample detected at only 1 time posttreatment or (2) treatment-induced/treatment-boosted NAb samples detected at 2 or more times where first and last positive samples separated by \<16 weeks, and participant's last sample was NAb or ADA negative.

Number of Participants With Injection Site Reactions (ISRs): Inhibitor and Non-Inhibitor Cohort
During prophylaxis treatment in ATP (12 months)

ISR included: injection site haematoma, injection site pain, injection site bruising, injection site erythema, injection site induration, injection site oedema, Injection site pruritus and Injection site swelling. ISR graded according to Common Terminology Criteria for Adverse Events (CTCAE) version 5.0 where grade 1: tenderness with or without associated symptoms (warmth, erythema, itching), grade 2: pain, lipodystrophy, edema, phlebitis, grade 3: ulceration or necrosis, severe tissue damage, operative intervention indicated, grade 4: life-threatening consequences, urgent intervention indicated and grade 5: death. In this outcome measure only categories with non-zero values reported.

Number of Participants With Clinically Significant Changes in Physical Examinations: Inhibitor and Non-Inhibitor Cohort
OP reporting group: Up to 6 months; ATP reporting group: up to 13 months (includes 28-35 days of safety follow-up post last dose of study drug)

Physical examination included assessments of the head, ears, eyes, nose, mouth, skin, heart and lung examinations, lymph nodes, gastrointestinal, musculoskeletal, and neurological systems. Height and weight were also measured and recorded. Clinical significance in physical examinations was determined by investigator.

Number of Participants With Clinically Significant Changes in Vital Signs: Inhibitor and Non-Inhibitor Cohort
OP reporting group: Up to 6 months; ATP reporting group: up to 13 months (includes 28-35 days of safety follow-up post last dose of study drug)

Vital signs included temperature, pulse rate, respiratory rate, and blood pressure. Blood pressure and pulse rate were measured in a supine position using completely automated device after at least 5 minutes of rest for the participant in a quiet setting without distractions. Respiratory rate was measured by observing and counting the respirations of the participant for 30 seconds and multiplied by 2. Clinical significance of vital signs was determined by investigator.

Number of Participants With Clinically Significant Abnormalities in Laboratory Parameters: Inhibitor and Non-Inhibitor Cohort
OP reporting group: Up to 6 months; ATP reporting group: up to 13 months (includes 28-35 days of safety follow-up post last dose of study drug)

Hematology included: hemoglobin; leukocytes; neutrophils; and platelets. Chemistry included: potassium; aspartate aminotransferase; creatinine; alkaline phosphatase; total bilirubin; albumin; calcium corrected, estimated decreased; sodium; and calcium. Clinical significance of laboratory parameters was determined by investigator.

Number of Participants With Severe/ Systematic Hypersensitivity and Anaphylactic Reactions: Inhibitor and Non-Inhibitor Cohort
During prophylaxis treatment in ATP (12 months)

Systemic hypersensitivity is a complex immune response where the immune system reacts excessively to an antigen, often leading to severe allergic reactions, including widespread symptoms (which may affect multiple organs), such as rash, swelling of your face, lips, mouth, or tongue, trouble breathing, wheezing, dizziness, fainting, fast heartbeat, pounding in your chest or sweating. Anaphylaxis is a severe, potentially fatal, systemic allergic reaction that occurs suddenly after contact with an allergy causing substance.

Number of Participants With Treatment-Emergent Adverse Events (TEAEs), TEAEs by Severity, and Serious Adverse Events (SAEs) (All Causality and Treatment-Related)
Day 1 up to Day 393

An adverse event (AE) was any untoward medical occurrence in a clinical investigation participant administered a product; the event did not need to have a causal relationship with the treatment. A serious adverse event (SAE) was any untoward medical occurrence at any dose that resulted in death; was life threatening; required inpatient hospitalization or prolongation of existing hospitalization; resulted in persistent or significant disability/incapacity; resulted in congenital anomaly/birth defect. AEs included both SAEs and non-serious AEs. TEAEs were AEs occurred following the start of treatment or AEs increasing in severity during treatment. Treatment-related TEAEs were determined by the investigator. Grades 3 AEs were severe and undesirable adverse events. Grades 4 AEs were life threatening or disabling adverse events.

Number of Participants With Abnormal Laboratory Findings Without Regard to Baseline Abnormality (Including Hematology, Serum Chemistry, and Urinalysis)
Hematology and serum chemistry: Baseline, Days 1, 29, 57, 85, 169, 253, and 365 visits. Urinalysis: Baseline, Days 1, 85, 169, 253, and 365 visits.

Following parameters were analyzed for laboratory examination: hematology, clinical chemistry, and urinalysis. The hematology parameters and pre-defined criteria included: neutrophils (10\^3/millimeter\[mm\]\^3) \<0.8\*lower limit of normal (LLN), and basophils (10\^3/mm\^3) \>1.2\*upper limit of normal (ULN). The clinical chemistry parameter and pre-defined criteria included: bilirubin (milligrams \[mg\]/decilitre \[dL\]) \>1.5 ULN, aspartate aminotransferase (units \[U\]/liter \[L\]) \>3.0 ULN, glucose (mg/dL) \>1.5\*ULN. The urinalysis parameter and pre-defined criteria included: urine glucose ≥1, ketones (scalar) ≥1, urine protein ≥1, urine hemoglobin (scalar) ≥1, and hyaline casts per low power field (/LPF). Participants met criteria at any time point were included.

Number of Participants With Changes From Baseline in Vital Signs Measurements Meeting the Pre-Defined Categorical Summarization Criteria
Baseline, Days 1, 29, 57, 85, 113, 141, 169, 197, 225, 253, 281, 309, 337, 365 and 393 visits.

Following parameters were analyzed for vital sign examination: blood pressure (BP), pulse rate (PR), temperature, respiration rate. Categorical vital signs: Temperature \>38.5 degree(s) Celsius (℃), Supine PR: \<40 or \>120 beats per minute (BPM), Systolic BP: \<90 mm Hg, \>=30 mm Hg change from baseline, Diastolic BP: \<50 mm Hg, \>=20 mm Hg change from baseline.

Number of Participants With Change From Baseline in Electrocardiogram (ECG) Parameters Meeting the Pre-defined Categorical Summarization Criteria
Baseline, Days 1 and 29 visits

Baseline was defined as the average of triplicate ECG measurements collected prior to dosing on Day 1 in B7841003. Criteria for potentially clinically important changes in ECG were defined as: PR interval value \>=300 millisecond (msec); PR interval baseline \>200 msec and change \>=25%; PR interval baseline \<=200 msec and change \>=50%; QRS complex value \>=140 msec and change \>=50%; QTcF value \>=450 msec and change \>=30 msec. Only the number of participants meeting pre-defined criteria was reported below.

Number of Participants With Abnormalities in Physical Examination Findings
Day 1 to Day 393

Physical examinations were conducted by a physician, trained physician's assistant, or nurse practitioner as acceptable according to local regulation. A full physical examination included head, ears, eyes, nose, mouth, skin, heart and lung examinations, lymph nodes, gastrointestinal, musculoskeletal, and neurological systems. The limited or abbreviated physical examination was focused on general appearance, the respiratory and cardiovascular systems, as well as towards participant reported symptoms. For measuring weight, a scale with appropriate range and resolution was used and must have been placed on a stable, flat surface. Participants removed shoes, bulky layers of clothing, and jackets so that only light clothing remains. They also removed the contents of their pockets and remain still during measurement of weight.

Number of Participants With Injection Site Reactions
Day 1 to Day 365, and Day 393 visit.

Injection site reactions included but were not limited to: erythema, induration, ecchymosis, pain and pruritus. Grade of severity was defined as follows: Mild: Transient or mild discomfort (\< 48 hours); no medical intervention/therapy required. Moderate: Mild to moderate limitation in activity - some assistance may be needed; no or minimal medical intervention/therapy required. Severe: Marked limitation in activity, some assistance usually required; medical intervention/therapy required, hospitalizations possible.

Number of Participants With Treatment Emergent Adverse Events (TEAEs)
Study Day 1 to Day 113 Visit

An adverse event (AE) was any untoward medical occurrence in a clinical investigation participant administered a product; the event did not need to have a causal relationship with the treatment. A serious adverse event (SAE) was any untoward medical occurrence at any dose that resulted in death; was life threatening; required inpatient hospitalization or prolongation of existing hospitalization; resulted in persistent or significant disability/incapacity; resulted in congenital anomaly/birth defect. AEs included both SAEs and non-serious AEs. TEAEs were AEs occurred following the start of treatment or AEs increasing in severity during treatment. Severe TEAEs were TEAEs that interfered significantly with participants' usual function. Treatment-related TEAEs were determined by the investigator.

Number of Participants Discontinued From Study Due to TEAEs
Study Day 1 to Day 113 Visit

An AE was any untoward medical occurrence in a clinical investigation participant administered a product; the event did not need to have a causal relationship with the treatment. TEAEs were AEs occurred following the start of treatment or AEs increasing in severity during treatment. Treatment-related TEAEs were determined by the investigator.

Number of Participants With Abnormal Laboratory Findings-Hematology
Baseline to Study Day 113 Visit

Hematology evaluation included: hemoglobin, hematocrit, erythrocytes, platelets, leukocytes, lymphocytes, neutrophils, basophils, eosinophils and monocytes. Predefined criteria for hemoglobin and hematocrit: \<0.8\*lower limit of normal (LLN) or \<0.8\*Baseline(Baseline \<1.0\*LLN); for platelets: \<100,000\*10\^3/mm\^3 or \<= 0.77\*Baseline (Baseline \<1.0\*LLN).

Number of Participants With Abnormal Laboratory Findings-Clinical Chemistry
Baseline to Study Day 113

Clinical chemistry evaluation included bilirubin, direct and indirect bilirubin, aspartate aminotransferase, alanine aminotransferase, gamma glutamyl transferase, alkaline phosphatase, protein, albumin, urea nitrogen, creatinine, urate, triglycerides, sodium, potassium, chloride, calcium, bicarbonate, glucose, creatine kinase, troponin I, cholesterol and fibrinogen.

Number of Participants With Abnormal Laboratory Findings-Urinalysis
Baseline to Study Day 113 Visit

Urinalysis included: pH, urine glucose, ketones, urine protein, urine hemoglobin, urobilinogen, urine bilirubin, nitrite, leukocyte esterase, urine erythrocytes, urine leukocytes and bacteria.

Change From Baseline for Globulin by Dose Cohort
Baseline, Study Day 8, 15, 22, 29, 57, 85 and 113.

Blood samples were obtained to determine globulin level in serum, total globulin was derived as total protein other than albumin.

Change From Baseline for Prothrombin International Normalized Ratio (PT/INR) by Dose Cohort
Baseline, Study Day 8, 15, 22, 29, 57, 85 and 113.

Blood samples were obtained to evaluate this ratio. The prothrombin time (PT) is a test that helps evaluate your ability to appropriately form blood clots. The international normalized ratio (INR) is a calculation based on results of a PT that is used to monitor individuals who are being treated with the blood-thinning medication (anticoagulant) warfarin (Coumadin®).

Change From Baseline for Activated Partial Thromboplastin Time (aPTT) by Dose Cohort
Baseline, Study Day 8, 15, 22, 29, 57, 85 and 113.

The activated partial thromboplastin time (aPTT) is a screening test that helps evaluate a person's ability to appropriately form blood clots. It measures the number of seconds it takes for a clot to form in a sample of blood after substances (reagents) are added. Blood sample were obtained to evaluate aPTT.

Change From Baseline for Fibrinogen by Dose Cohort
Baseline, Study Day 8, 15, 22, 29, 57, 85 and 113.

Fibrinogen is a protein, specifically a clotting factor (factor I), that is essential for proper blood clot formation. Blood samples were obtained to evaluate the amount of fibrinogen.

Change From Baseline for Antithrombin III by Dose Cohort
Baseline, Study Day 8, 15, 22 and 29.

Antithrombin (AT) is a protein produced by the liver that helps regulate blood clot formation (i.e., a naturally-occurring mild blood thinner). Blood samples were collected to measure the activity (function) and the amount (quantity) of antithrombin in an individual's blood is used to evaluate the person for excessive blood clotting.

Change From Baseline for Troponin I by Dose Cohort
Baseline, Study Day 8, 15, 22, 29, 57 and 85.

Blood samples were collected to measure the level of cardiac-specific troponin I in the blood to help detect heart injury.

Number of Participants With Vital Signs Data Meeting Pre-specified Criteria
Baseline to Study Day 113 Visit

Criteria for potentially clinically important findings in vital signs data were defined as: 1) supine systolic blood pressure (BP): value \<90 mm Hg or change \>=30 mm Hg increase; 2) Supine diastolic BP: value \<50 mm Hg or change \>=20 mm Hg increase; 3) Supine pulse rate: value \<40 beats/min or \>120 beats/min.

Number of Participants With Electrocardiogram (ECG) Change Meeting Pre-specified Criteria
Baseline to Study Day 29 Visit.

Criteria for potentially clinically important changes in ECG were defined as: PR interval baseline \>200 msec and increase of \>=25%; PR interval baseline \<=200 msec and increase of \>=50%; QRS interval increase of \>=50%. Only the number of participants meeting pre-defined criteria was reported below.

Number of Participants With Clinically Significant Changes in Physical Examination Findings
Baseline to Study Day 113 Visit

Physical examination included head, ears, eyes, nose, mouth, skin, heart and lung examinations, lymph nodes, gastrointestinal, musculoskeletal, and neurological systems. Clinical significance was judged by the investigator.

Number of Participants With Infusion and Injection Site Reactions
Baseline to Study Day 113 Visit

Infusion and injection site reactions included: injection site bruising, injection site erythema, injection site haemorrhage, injection site induration, injection site pain, injection site pruritus, injection site swelling and injection site warmth. Grade of severity was defined as follows: Mild: Transient or mild discomfort (\< 48 hours); no medical intervention/therapy required. Moderate: Mild to moderate limitation in activity - some assistance may be needed; no or minimal medical intervention/therapy required. Severe: Marked limitation in activity, some assistance usually required; medical intervention/therapy required, hospitalizations possible.

Number of Participants With Treatment-Emergent Adverse Events (TEAEs)
Day 1 to Day 42

An adverse event (AE) was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship with study treatment. TEAEs=AEs that started during the effective duration of treatment regardless of whether a similar event existed at baseline. Grades of AEs were defined by National Cancer Institute Common Toxicity Criteria for Adverse Events (NCI CTCAE) version 5.0. Grade 1=asymptomatic/mild symptoms, clinical or diagnostic observations only, intervention not indicated;Grade 2=minimal, local or noninvasive intervention indicated, limiting age-appropriate instrumental activity of daily living (ADL);Grade 3=severe or medically significant but not immediately life-threatening, hospitalization of prolongation of hospitalization indicated; disabling limiting self-care ADL;Grade 4=events with life-threatening consequences, urgent intervention indicated;Grade 5= death related to AE.Treatment-related TEAEs were determined by investigator.

Number of Participants With Serious Adverse Events (SAEs)
Day 1 to Day 42

An SAE was any untoward medical occurrence at any dose that resulted in death; was life threatening; required inpatient hospitalization or prolongation of existing hospitalization; resulted in persistent disability/incapacity; was a congenital anomaly/birth defect. Treatment-related SAEs were determined by the investigator.

Number of Participants With Maximum Grade 3 or 4 or 5 TEAEs
Day 1 to Day 42

An AE was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship with study treatment. TEAEs=AEs that started during the effective duration of treatment regardless of whether a similar event existed in the baseline period. Grades of AEs were defined by NCI CTCAE version 5.0. Grade 1=asymptomatic/mild symptoms, clinical or diagnostic observations only, intervention not indicated; Grade 2=minimal, local or noninvasive intervention indicated, limiting age-appropriate instrumental activity of daily living (ADL); Grade 3=severe or medically significant but not immediately life-threatening, hospitalization of prolongation of hospitalization indicated; disabling limiting self-care ADL; Grade 4=events with life-threatening consequences, urgent intervention indicated; Grade 5= death related to AE. Treatment-related TEAEs were determined by the investigator.

Number of Participants With TEAEs Leading to Permanent or Temporary Discontinuation From Study
Day 1 to Day 42

An AE was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship with study treatment. TEAEs=AEs that started during the effective duration of treatment regardless of whether a similar event of equal or greater severity existed in the baseline period. Grades of AEs were defined by NCI CTCAE version 5.0. Grade 1=asymptomatic/mild symptoms, clinical or diagnostic observations only, intervention not indicated; Grade 2=minimal, local or noninvasive intervention indicated, limiting age-appropriate instrumental activity of daily living (ADL); Grade 3=severe or medically significant but not immediately life-threatening, hospitalization of prolongation of hospitalization indicated; disabling limiting self-care ADL; Grade 4=events with life-threatening consequences, urgent intervention indicated; Grade 5= death related to AE. Treatment-related TEAEs were determined by the investigator.

Number of Participants With Laboratory Abnormalities Without Regard to Baseline Abnormality
Day 1 to Day 28

Laboratory assessments included chemistry, hematology, Prothrombin Time/International Normalized Ratio (PT/INR), Activated Partial Thromboplastin Time (APTT), urinalysis, fibrinogen, Antithrombin III (ATIII) activity, and Cardiac Troponin I (cTnI). Laboratory test abnormalities reported by at least 1 participant are reported in this outcome measure. ULN = upper limit of normal.

Mean Absolute Value of Prothrombin Time (PT) / International Normalized Ratio (INR)
Day 1, Day 2, Day 7, Day 14, Day 21, Day 28

PT is one of the laboratory tests to evaluate the ability of blood clotting. The INR is derived from PT which is calculated as a ratio of a participant's PT to a control PT standardized for the potency of the thromboplastin reagent developed by the World Health Organization (WHO) using the following formula: INR = Participant PT / Control PT. Blood samples were obtained to evaluate PT/INR.

Change From Baseline in PT/INR at Days 2, 7, 14, 21 and 28
Baseline (Day 1), Day 2, Day 7, Day 14, Day 21, Day 28

PT is one of the laboratory tests to evaluate the ability of blood clotting. The INR is derived from PT which is calculated as a ratio of a participant's PT to a control PT standardized for the potency of the thromboplastin reagent developed by the WHO using the following formula: INR = Participant PT / Control PT. Blood samples were obtained to evaluate PT/INR.

Mean Absolute Value of Activated Partial Thromboplastin Time (APTT)
Day 1, Day 2, Day 7, Day 14, Day 21, Day 28

The APTT is a screening test that helps evaluate a person's ability to appropriately form blood clots. It measures the number of seconds it takes for a clot to form in a sample of blood after substances (reagents) are added. Blood samples were obtained to evaluate APTT.

Change From Baseline in APTT at Days 2, 7, 14, 21 and 28
Baseline (Day 1), Day 2, Day 7, Day 14, Day 21, Day 28

The APTT is a screening test that helps evaluate a person's ability to appropriately form blood clots. It measures the number of seconds it takes for a clot to form in a sample of blood after substances (reagents) are added. Blood samples were obtained to evaluate APTT.

Mean Absolute Value of Fibrinogen
Day 1, Day 2, Day 7, Day 14, Day 21, Day 28

Fibrinogen is a protein, specifically a clotting factor (factor I), that is essential for proper blood clot formation. Blood samples were obtained to evaluate the amount of fibrinogen.

Change From Baseline in Fibrinogen at Days 2, 7, 14, 21 and 28
Baseline (Day 1), Day 2, Day 7, Day 14, Day 21, Day 28

Fibrinogen is a protein, specifically a clotting factor (factor I), that is essential for proper blood clot formation. Blood samples were obtained to evaluate the amount of fibrinogen.

Mean Absolute Value of Antithrombin III (ATIII)
Day 1, Day 2, Day 7, Day 14, Day 21, Day 28

ATIII is a nonvitamin K-dependent protease that inhibits coagulation by lysing thrombin and factor Xa. The antithrombin activity test measures how well the protein inhibits thrombin, with a reference range of 75% - 125%. Blood samples were obtained to evaluate ATIII activity.

Change From Baseline in ATIII at Days 2, 7, 14, 21 and 28
Baseline (Day 1), Day 2, Day 7, Day 14, Day 21, Day 28

ATIII is a nonvitamin K-dependent protease that inhibits coagulation by lysing thrombin and factor Xa. The antithrombin activity test measures how well the protein inhibits thrombin, with a reference range of 75% - 125%. Blood samples were obtained to evaluate ATIII activity.

Mean Absolute Value of Cardiac Troponin I (cTnI)
Day 1, Day 2, Day 4

cTnI is one of the cardiac regulatory proteins that control the calcium mediated interaction between actin and myosin, and is considered a specific marker for cardiac damage. Blood samples were obtained to evaluate the amount of cTnI.

Change From Baseline in cTnI at Days 2 and 4
Baseline (Day 1), Day 2, Day 4

cTnI is one of the cardiac regulatory proteins that control the calcium mediated interaction between actin and myosin, and is considered a specific marker for cardiac damage. Blood samples were obtained to evaluate the amount of cTnI.

Number of Participants With Vital Signs Data Meeting Categorical Criteria of Potential Clinical Concern
Day 1 to Day 28

Vital signs measurements included blood pressure (BP), pulse rate, respiratory rate and oral temperature. Categorical classes for vital signs of potential clinical concern included: (1) systolic BP - minimum (min) value \<90 mmHg, maximum (max) decrease/increase from baseline \>=30 mmHg; (2) diastolic BP - min value \<50 mmHg, max decrease/increase from baseline \>=20 mmHg; (3) supine pulse rate - min \<40 beat per minute (bpm) or max \>120 bpm; (4) standing pulse rate - min \<40 bpm or max \>140 bpm; (5) oral temperature \> 38.5 celsius degree (°C). BPs were measured in a supine position so standing BPs were not evaluated and not reported.

Change From Baseline in Supine Systolic BP at Days 1, 2, 3, 4, 7, 14, 21 and 28
Day 1 pre-dose (baseline); 1 hour, 2 hours, 4 hours, 8 hours and 12 hours post Day 1 dosing; Day 2; Day 3; Day 4; Day 7; Day 14; Day 21; Day 28.

BPs were assessed in a supine position with a completely automated device. Categorical classes for supine systolic BP of potential clinical concern included min value \<90 mmHg, max decrease/increase from baseline \>=30 mmHg.

Change From Baseline in Diastolic Systolic BP at Days 1, 2, 3, 4, 7, 14, 21 and 28
Day 1 pre-dose (baseline); 1 hour, 2 hours, 4 hours, 8 hours and 12 hours post Day 1 dosing; Day 2; Day 3; Day 4; Day 7; Day 14; Day 21; Day 28.

BPs were assessed in a supine position with a completely automated device. Categorical classes for supine diastolic BP of potential clinical concern included min value \<50 mmHg, max decrease/increase from baseline \>=20 mmHg.

Change From Baseline in Supine Pulse Rate at Days 1, 2, 3, 4, 7, 14, 21 and 28
Day 1 pre-dose (baseline); 1 hour, 2 hours, 4 hours, 8 hours and 12 hours post Day 1 dosing; Day 2; Day 3; Day 4; Day 7; Day 14; Day 21; Day 28.

Pulse rates were assessed in a supine position with a completely automated device. Categorical classes for supine pulse rate of potential clinical concern included min value \<40 bpm or max value \>120 bpm.

Change From Baseline in Oral Temperature at Days 1, 2, 3, 4, 7, 14, 21 and 28
Day 1 pre-dose (baseline); 1 hour, 2 hours, 4 hours, 8 hours and 12 hours post Day 1 dosing; Day 2; Day 3; Day 4; Day 7; Day 14; Day 21; Day 28.

No eating, drinking, or smoking was allowed for 15 minutes prior to the measurement of oral temperature. The criterion for oral temperature of potential clinical concern was oral temperature \> 38.5°C.

Change From Baseline in Respiratory Rate at Days 1, 2, 3, 4, 7, 14, 21 and 28
Day 1 pre-dose (baseline); 1 hour, 2 hours, 4 hours, 8 hours and 12 hours post Day 1 dosing; Day 2; Day 3; Day 4; Day 7; Day 14; Day 21; Day 28.

Respiratory rate measurement was preceded by at least 5 minutes of rest for the participant in a quiet setting without distractions. Respiratory rate was measured in terms of "breaths per minute", and was measured by observing and counting the respirations of the participant for 30 seconds and multiplied by 2.

Number of Participants With Electrocardiogram (ECG) Data Meeting Categorical Criteria of Potential Clinical Concern
Day 1 to Day 28

Single 12-lead ECGs were performed for all participants in a supine position using an ECG machine that automatically calculated heart rate and measured PR, QRS and QT intervals. If a single time point ECG was abnormal, a triplicate ECG was required and obtained approximately 2-4 minutes apart; the average of triplicate ECG measurements collected at pre-dose Day 1 served as each participant's baseline value. Categorical classes for ECG data of potential clinical concern included: (1) QTcF - 450 millisecond (msec)≤ max value \<480 msec, 480 msec ≤ max value \<500 msec, max value ≥500 msec; 30 msec ≤ QTcF max increase from baseline \<60 msec; max increase from baseline ≥60 msec; (2) PR interval - max value ≥300 msec, baseline value\>200 and max increase from baseline ≥25%, baseline value ≤200 and max increase from baseline ≥50%; (3) QRS interval - max value ≥140 msec, increase from baseline ≥50%.

Change From Baseline in ECG Mean Heart Rate at Days 1, 2, 3, 4, 7, 14, 21 and 28
Day 1 pre-dose (baseline); 1 hour, 2 hours, 4 hours, 8 hours and 12 hours post Day 1 dosing; Day 2; Day 3; Day 4; Day 7; Day 14; Day 21; Day 28.

Heart rate was measured in terms of "beats per minute". Single 12-lead ECGs were performed for all participants in a supine position using an ECG machine that automatically calculated the heart rate and measured PR, QRS, and QT intervals. If a single time point ECG was abnormal, a triplicate ECG was required, which were obtained approximately 2-4 minutes apart; the average of the triplicate ECG measurements collected at pre-dose Day 1 served as each participant's baseline value.

Change From Baseline in PR Interval at Days 1, 2, 3, 4, 7, 14, 21 and 28
Day 1 pre-dose (baseline); 1 hour, 2 hours, 4 hours, 8 hours and 12 hours post Day 1 dosing; Day 2; Day 3; Day 4; Day 7; Day 14; Day 21; Day 28.

Single 12-lead ECGs were performed for all participants in a supine position using an ECG machine that automatically calculated the heart rate and measured PR, QRS, and QT intervals. Categorical classes for PR interval data of potential clinical concern included: max value ≥300 ms, baseline value\>200 and max increase from baseline≥25%, baseline value ≤200 and max increase from baseline ≥50%.

Change From Baseline in QRS Interval at Days 1, 2, 3, 4, 7, 14, 21 and 28
Day 1 pre-dose (baseline); 1 hour, 2 hours, 4 hours, 8 hours and 12 hours post Day 1 dosing; Day 2; Day 3; Day 4; Day 7; Day 14; Day 21; Day 28.

Single 12-lead ECGs were performed for all participants in a supine position using an ECG machine that automatically calculated the heart rate and measured PR, QRS, and QT intervals. Categorical classes for QRS interval data of potential clinical concern included: max value ≥140 ms, increase from baseline ≥50%.

Change From Baseline in QT Interval at Days 1, 2, 3, 4, 7, 14, 21 and 28
Day 1 pre-dose (baseline); 1 hour, 2 hours, 4 hours, 8 hours and 12 hours post Day 1 dosing; Day 2; Day 3; Day 4; Day 7; Day 14; Day 21; Day 28.

Single 12-lead ECGs were performed for all participants in a supine position using an ECG machine that automatically calculated the heart rate and measured PR, QRS, and QT intervals.

Change From Baseline in QT Interval Corrected at Days 1, 2, 3, 4, 7, 14, 21 and 28
Day 1 pre-dose (baseline); 1 hour, 2 hours, 4 hours, 8 hours and 12 hours post Day 1 dosing; Day 2; Day 3; Day 4; Day 7; Day 14; Day 21; Day 28.

Single 12-lead ECGs were performed for all participants in a supine position using an ECG machine that automatically calculated the heart rate and measured PR, QRS, and QT intervals. The corrected QT interval (QTc) estimates the QT interval at a standard heart rate of 60 bpm.

Change From Baseline in Corrected QT Interval (Fridericia Method) (QTcF Interval) at Days 1, 2, 3, 4, 7, 14, 21 and 28
Day 1 pre-dose (baseline); 1 hour, 2 hours, 4 hours, 8 hours and 12 hours post Day 1 dosing; Day 2; Day 3; Day 4; Day 7; Day 14; Day 21; Day 28.

Single 12-lead ECGs were performed for all participants in a supine position using an ECG machine that automatically calculated the heart rate and measured PR, QRS, and QT intervals. QTcF = QT interval corrected using the Fridericia method. Categorical classes for QTcF data of potential clinical concern included: 450 ms≤ max value \<480 ms, 480≤ max value \<500 ms, max value ≥500 ms; 30 ms ≤ QTcF max increase from baseline \<60 ms; max increase from baseline ≥60 ms.

Number of Participants With Physical Examination Findings
Screening (Day -35 to Day -2), Day -1, Day 1 (for general appearance, heart, lungs), Day 7 (for general appearance, heart, lungs), Day 28 (for general appearance, heart, lungs)

A complete PE included assessments of the head, ears, eyes, nose, mouth, skin, heart and lung examinations, lymph nodes, gastrointestinal, musculoskeletal, and neurological systems. A brief PE included assessments of the general appearance, the respiratory and cardiovascular systems, as well as participant reported symptoms. The full PE planned for Screening may have been performed on Day -1 before dosing at the discretion of the Investigator. If a full PE was done at Screening visit, a brief PE was to be conducted on Day-1. After Day -1, brief examinations based on signs and symptoms may have been performed if clinically indicated at the discretion of the Investigator to assess changes from baseline/previous visits of any ongoing symptoms.

Frequency, severity and causal relationship of treatment emergent adverse events (TEAEs) and withdrawals due to TEAEs
Day 1 up to Day 84
Percentage of subjects with laboratory abnormalities
Day 1 up to Day 84
Number of subjects with change from baseline in vital signs
Day 1 up to Day 84

blood pressure, pulse rate, temperature, respiration rate

Number of subjects with change from baseline in electrocardiogram (ECG) parameters
Day 1 to Day 84
Percentage of subjects with changes from baseline in physical examination
Day 1 to Day 84
Percentage of subjects with infusion site reactions
Day 1 up to Day 7
Percentage of subjects with injection site reactions
Day 1 to Day 7

Secondary Endpoints

Annualized rate of bleeding episodes
Baseline up to 7 years
Total coagulation factor product consumption
Baseline up to 7 years
Incidence of joint bleeds
Baseline up to 7 years
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
PF-06741086EXPERIMENTALFor participants aged ≥12 years 300 milligrams(mg) subcutaneous (sc) loading dose followed by 150 mg sq once weekly (qw). 300 mg sc qw is prescribed for participants who meet dose escalation criteria. For participants aged ≥6 to \<12 years is marstacimab 150 mg SC for initial loading dose followed by 75 mg SC QW. 150 mg sc qw is prescribed for participants who meet dose escalation criteria.
PF-06741086 (Cohort 1)EXPERIMENTAL -
PF-06741086 (Cohort 2)EXPERIMENTAL -
PF-06741086 (Cohort 3)EXPERIMENTAL -
PF-06741086 (Cohort 4)EXPERIMENTAL -
PF-06741086 (Cohort 5)EXPERIMENTAL -
PF-06741086 (Cohort 6)EXPERIMENTAL -
single armEXPERIMENTALPF-06741086 300mg subcutaneous(SC)
Cohort 1 (subcutaneous [SC]) PF-06741086, PlaceboEXPERIMENTAL -
Cohort 2 (SC) PF-06741086, PlaceboEXPERIMENTAL -
Cohort 3 (SC) PF-06741086, PlaceboEXPERIMENTAL -
Cohort 4 (Intravenous [IV]) PF-06741086, PlaceboEXPERIMENTAL -
Cohort 5 (IV) PF-06741086, PlaceboEXPERIMENTAL -
Cohort 6 (IV) PF-06741086, PlaceboEXPERIMENTAL -
Cohort 7 (IV) PF-06741086, PlaceboEXPERIMENTAL -
Cohort 8 (subcutaneous [SC]) PF-06741086EXPERIMENTAL -

Interventions

NameTypeDescription
PF-06741086DRUGFor participants aged ≥12 years 300 milligrams(mg) subcutaneous (sc) loading dose followed by 150 mg sq once weekly (qw). 300 mg sc qw is prescribed for participants who meet dose escalation criteria. For participants aged ≥6 to \<12 years is marstacimab 150 mg SC for initial loading dose followed by 75 mg SC QW. 150 mg sc qw is prescribed for participants who meet dose escalation criteria.
PlaceboDRUGPlacebo for PF-06741086, single dose
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Eligibility Criteria

Age Range1 Year to 74 Years
SexMALE
Healthy VolunteersNo
Study Sites75

Inclusion Criteria: * All participants will have a minimum body weight as defined by parent studies * Participants who are willing and able to comply with all scheduled visits, treatment plan, laboratory tests, and other study procedures. * Participants have successfully completed participation in ...

Countries:United StatesArgentinaAustraliaBrazilCanadaChinaCroatiaDenmarkFranceHong KongIndiaIsraelItalyJapanMexicoOmanSerbiaSlovakiaSouth AfricaSouth KoreaSpainTaiwanTurkey (Türkiye)United KingdomBulgariaRussiaSaudi ArabiaChilePolandSwitzerlandBelgium
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Recent Changes (Last 90 Days)

LOWJul 2, 2026NCT05145127lastUpdatePostDate: changed
LOWJul 2, 2026NCT05145127lastUpdatePostDate: changed
LOWJul 2, 2026NCT05145127lastUpdatePostDate: changed
LOWJul 2, 2026NCT05145127lastUpdatePostDate: changed

Frequently asked questions about PF-06741086

What is PF-06741086 used for?

PF-06741086 is an investigational monoclonal antibody being developed for hemophilia A and hemophilia B, including severe forms of these conditions. It is also studied in healthy volunteers. The drug is designed for subcutaneous administration and is being evaluated in clinical trials for the treatment of bleeding disorders.

What does PF-06741086 target?

PF-06741086 targets TFPI, which stands for tissue factor pathway inhibitor, a protein that regulates blood clotting. By targeting TFPI, the drug aims to enhance clot formation in patients with hemophilia. This mechanism is being studied in clinical trials for hemophilia A and B.

Who makes PF-06741086?

PF-06741086 is developed by Pfizer, Inc., a multinational pharmaceutical company listed on the New York Stock Exchange under the ticker symbol PFE. Pfizer is conducting clinical trials to evaluate the drug's safety and efficacy in patients with hemophilia.

What phase is PF-06741086 in?

PF-06741086 is in Phase 3 clinical development. It has completed Phase 2 trials and is currently being studied in a Phase 3 open-label extension trial. The drug is investigational and not yet approved by regulatory authorities for commercial use.

What clinical trials is PF-06741086 in?

PF-06741086 has been studied in several clinical trials, including NCT02974855 and NCT03363321, which were Phase 2 studies in severe hemophilia. A Phase 3 trial, NCT03938792, evaluated efficacy and safety, and an ongoing Phase 3 open-label extension study, NCT05145127, is currently recruiting participants.

Is PF-06741086 the same as marstacimab?

Yes, PF-06741086 is also known as marstacimab. The ongoing Phase 3 open-label extension study, NCT05145127, is titled 'Open-Label Extension Study of Marstacimab in Hemophilia Participants With or Without Inhibitors,' confirming that PF-06741086 and marstacimab refer to the same drug.