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AskBio009

Phase 1

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

Target and mechanism

Molecular targetFIX
ModalityMonoclonal antibody

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment30

FDA Designations

No designations recorded

Clinical trial landscape

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 used for in Hemophilia B?

AskBio009 is an investigational gene therapy being studied for the treatment of Hemophilia B in adults. It is currently in Phase 1 clinical development and is not yet approved by regulatory authorities.

What does AskBio009 target?

AskBio009 targets Factor IX (FIX), the clotting protein that is deficient or defective in Hemophilia B. By delivering a functional copy of the Factor IX gene, the therapy aims to enable the body to produce the clotting factor.

Who is developing AskBio009?

AskBio009 is being developed by Takeda Pharmaceutical Company Limited (TSE: 4502, NYSE: TAK). The company is conducting a Phase 1 clinical trial to evaluate the therapy in adults with Hemophilia B.

What phase is AskBio009 in?

AskBio009 is in Phase 1 clinical development. It is an investigational therapy and has not received FDA approval. The ongoing Phase 1 trial is active but not recruiting participants.

What clinical trials is AskBio009 in?

AskBio009 is being studied in a single Phase 1 clinical trial with the identifier NCT01687608. This open-label, uncontrolled trial is evaluating a single ascending dose of the gene therapy in 30 adult males with Hemophilia B in the United States.

Is AskBio009 the same as an AAV8 Factor IX gene therapy?

AskBio009 is an adeno-associated virus serotype 8 (AAV8) Factor IX gene therapy. The clinical trial NCT01687608 is titled 'Open-Label Single Ascending Dose of Adeno-associated Virus Serotype 8 Factor IX Gene Therapy in Adults With Hemophilia B.'