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AskBio009

Phase 1

Hemophilia B | Monoclonal antibody | Hematology |Takeda Pharmaceutical Company Limited|Trials Updated: Mar 20, 2026

AskBio009 development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Sep 2012

AskBio009 target and mechanism

Molecular targetFIX
ModalityMonoclonal antibody

Also known as BAX 335

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLEDDMC
Total Trials1
Total Enrollment30

FDA Designations

No designations recorded

AskBio009 clinical trials

AskBio009 · 1 trial · 1 indication

Phase 1 1
NCT01687608Open-Label Single Ascending Dose of Adeno-associated Virus Serotype 8 Factor IX Gene Therapy in Adults With Hemophilia BHemophilia B
ACTIVE NOT_RECRUITING30 Analytics
PHASE1ACTIVE NOT_RECRUITING
Open-Label Single Ascending Dose of Adeno-associated Virus Serotype 8 Factor IX Gene Therapy in Adults With Hemophilia B
Hemophilia BUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of patients experiencing treatment-related adverse events by dose group
Infusion to Week 3 and Infusion to end of study
Change from baseline in clinical laboratory evaluations
Change from baseline at week 3 and change from baseline at the end of study

Secondary Endpoints

Changes from Baseline in FIX activity levels, FIX protein levels, and Bleeding Episode Severity & Frequency
At multiple timepoints from pre-dose through up to 5 years post-dose
Immune Response to AskBio009
At multiple timepoints from pre-dose through up to 5 years post-dose
Detection of AskBio009 genomes in blood, saliva, urine, stool, and semen
At multiple timepoints from pre-dose through up to 1 years post-dose
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
AskBio009 Dose EscalationEXPERIMENTALSingle Dose of a Self-Complementing Optimized Adeno-associated Virus (AAV) Serotype 8 Factor IX Gene Therapy

Interventions

NameTypeDescription
AskBio009BIOLOGICALSingle dose IV injection
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Eligibility Criteria

Age Range18 Years to 75 Years
SexMALE
Healthy VolunteersNo
Study Sites15

Inclusion Criteria: * Males age 18-75 years, inclusive * Established hemophilia B with ≥3 hemorrhages per year requiring treatment with exogenous FIX OR use of FIX prophylaxis because of history of frequent bleeding episodes * Plasma FIX activity ≤2% (\<1% for first cohort; then per protocol) * Neg...

Countries:United States
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Frequently asked questions about AskBio009

What is AskBio009?

AskBio009 is an investigational monoclonal antibody being developed by Takeda Pharmaceutical Company Limited for the treatment of Hemophilia B. It is in Phase 1 clinical development and is designed to target factor IX (FIX). It has not been approved by the FDA and remains an experimental therapy under study.

What is AskBio009 used for in Hemophilia B?

AskBio009 is being studied for use in Hemophilia B, a bleeding disorder. The single Phase 1 trial enrolled 30 adult male participants with Hemophilia B in the United States. Because the trial is an open-label, single ascending dose study, AskBio009 is still investigational and is not an approved treatment for Hemophilia B.

What does AskBio009 target?

AskBio009 targets factor IX, also known as FIX. Factor IX is a clotting protein that is deficient or defective in people with Hemophilia B. By binding to FIX, the monoclonal antibody is intended to interact with this component of the coagulation pathway, though the clinical significance of this targeting is still being evaluated in Phase 1 testing.

Who is developing AskBio009?

AskBio009 is being developed by Takeda Pharmaceutical Company Limited, which trades under the ticker TAK. Takeda is the sponsor of the Phase 1 clinical program evaluating the monoclonal antibody in adults with Hemophilia B. The company holds the development rights for this investigational asset.

What phase is AskBio009 in?

AskBio009 is in Phase 1 clinical development. It is an investigational monoclonal antibody and has not been approved by the FDA for any indication. The Phase 1 program is designed to assess the drug in adults with Hemophilia B, and further development would depend on the results of this early-stage study.

What clinical trials is AskBio009 in?

AskBio009 is being evaluated in one clinical trial, NCT01687608, titled Open-Label Single Ascending Dose of Adeno-associated Virus Serotype 8 Factor IX Gene Therapy in Adults With Hemophilia B. The trial is Phase 1, active but not recruiting, and enrolled 30 adult male participants with Hemophilia B in the United States.