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Antithrombin III

Phase 2

ATIII Deficiency | Small molecule | Other |Grifols, S.A.|Trials Updated: May 14, 2025

Antithrombin III development status

Highest phase Phase 2
Registered trials 4 across 4 sponsors since Jan 2009

Antithrombin III target and mechanism

Molecular targetF10, F2
Target classInhibitor
ModalitySmall molecule

Also known as Thrombate III, Anbinex, ATIII

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials3
Total Enrollment559

FDA Designations

No designations recorded

Antithrombin III clinical trials

Antithrombin III · 3 trials · 6 indications

Phase 2 3
NCT05794165Antithrombin to Improve Thromboprophylaxis and Reduce the Incidence of Trauma-Related Venous ThromboembolismTrauma Injury
ENROLLING BY_INVITATION314 Analytics
NCT02103114Anti-thrombin III (ATIII) vs Placebo in Children (<7mo) Undergoing Open Congenital Cardiac SurgeryATIII Deficiency
COMPLETED45 Analytics
NCT00823082Use of Antithrombin in Cardiac Surgery With Cardiopulmonary BypassAcquired Antithrombin III Deficiency
COMPLETED200 Analytics
PHASE2ENROLLING BY_INVITATION
Antithrombin to Improve Thromboprophylaxis and Reduce the Incidence of Trauma-Related Venous Thromboembolism
Trauma InjuryUnlock trial analytics
PHASE2COMPLETED
Anti-thrombin III (ATIII) vs Placebo in Children (<7mo) Undergoing Open Congenital Cardiac Surgery
ATIII DeficiencyUnlock trial analytics
PHASE2COMPLETED
Use of Antithrombin in Cardiac Surgery With Cardiopulmonary Bypass
Acquired Antithrombin III DeficiencyUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of participants with incidences of venous thromboembolism (VTE )
14 days post hospital admission
Number of participants with incidence of antifactor Xa (anti-FXa) of ≥0.2 IU/mL
14 days post hospital admission
Difference in the Mean and Standard Deviation (SD) of the Calibrated Automated Thrombography (CAT) Measurements of the Control and ATIII Groups at Time 5 (on Arrival in ICU)
Time 5 (on arrival in ICU)

Evidence of decreased activation of the coagulation and fibrinolytic systems represented by a difference in the mean and Standard Deviation (SD) of the Calibrated Automated Thrombography (CAT) measurements of the control and ATIII groups at Time 5 (on arrival in ICU).

Postoperative ATIII Levels at the ICU Admission
ICU admission

Measurement of postoperative ATIII functional activity at ICU admission

Percentage of Subjects With ATIII Levels of 58% or Higher at ICU Admission
ICU admission

Percentage of subjects with ATIII levels of 58% functional activity or higher at ICU admission

Secondary Endpoints

Time taken to achieve anti-FXa of ≥0.2 IU/mL
14 days post hospital admission
Number of enoxaparin dose escalations
from the time of hospital admission to the time of hospital discharge or 30 days (whichever occurs first)
Number of incidences of participants with other thrombotic complications (arterial thrombosis, myocardial infarction, stroke)
from the time of hospital admission to the time of hospital discharge or 30 days (whichever occurs first)
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Thrombate infusionEXPERIMENTAL -
PlaceboPLACEBO_COMPARATOR -
Anti-thrombin IIIEXPERIMENTAL -
Antithrombin III treatment groupEXPERIMENTALPreoperative ATIII supplementation administered immediately after anesthesia induction
Control groupNO_INTERVENTIONNo preoperative ATIII supplementation administered

Interventions

NameTypeDescription
Thrombate infusionDRUGBolus intravenous infusion of Thrombate will be given to achieve antithrombin (AT) activity levels at 150% before the 3rd dose of Enoxaparin. The dose will be based on patient weight.
PlaceboDRUGNormal Saline will be given as one time IV before the 3rd dose of Enoxaparin. The dose will be based on patient weight.
Anti-thrombin IIIDRUGIntraoperatively- (correcting to 100%) according to the following formula: Units required = ((100%- baseline ATIII level\*%) X body weight)/1.4 * expressed as a % normal level based on functional ATIII assay
Antithrombin IIIDRUGSingle dose of antithrombin III sufficient to achieve a preoperative level of 120%
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites4

Inclusion Criteria: * Admission to trauma service * Polytraumatic injuries OR pelvic/long bone fracture * Planned admission to trauma ICU or step-down/SIMU setting (this includes STICU, SIMU/TIMU, BICU, and BIMU) * Informed consent obtained Exclusion Criteria: * Prisoners (defined as those direct...

Countries:United StatesItaly
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Frequently asked questions about Antithrombin III

What is Antithrombin III used for?

Antithrombin III is being studied for ATIII Deficiency and Acquired Antithrombin III Deficiency, including in children under seven months undergoing open congenital cardiac surgery and in adults having cardiac surgery with cardiopulmonary bypass. It is an investigational therapy in Phase 2 development and has not been approved for these uses.

What does Antithrombin III target?

Antithrombin III targets coagulation factors F10 and F2, also known as factor Xa and thrombin. It acts as an inhibitor of these clotting factors, which is the basis for its evaluation in patients with deficient or acquired antithrombin levels who are at risk of excessive clot formation.

Who is developing Antithrombin III?

Antithrombin III is being developed by Grifols, S.A., which trades under the ticker GRFS. The company is the sponsor associated with the clinical program evaluating the agent in ATIII Deficiency and Acquired Antithrombin III Deficiency.

What phase is Antithrombin III in?

Antithrombin III is in Phase 2 clinical development. It is investigational and has not been approved by the FDA. The program includes completed Phase 2 trials, and no active trials are currently listed.

What clinical trials is Antithrombin III in?

Antithrombin III has been studied in two completed Phase 2 trials. NCT02103114 compared Anti-thrombin III with placebo in children under seven months undergoing open congenital cardiac surgery in the United States. NCT00823082 evaluated antithrombin use in adults having cardiac surgery with cardiopulmonary bypass in Italy.

Is Antithrombin III the same as Anti-thrombin III?

Yes, Antithrombin III and Anti-thrombin III refer to the same agent. The two spellings are used interchangeably in trial titles and medical literature, so searches for either name lead to the same Grifols development program for ATIII Deficiency.