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BAY2599023

Phase 1

Hemophilia A | Small molecule | Hematology |Bayer AG|Last Updated: Jul 6, 2026

Target and mechanism

ModalitySmall molecule

Also known as BAY2599023 (DTX201)

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLEDDMC
Total Trials1
Total Enrollment11

FDA Designations

No designations recorded

Clinical trial landscape

BAY2599023 · 1 trial · 1 indication

Phase 1 1
NCT03588299Study to Test the Safety and How Well Patients With Severe Hemophilia A Respond to Treatment With BAY 2599023 (DTX 201), a Drug Therapy That Delivers a Healthy Version of the Defective Factor VIII Gene Into the Nucleus of Liver Cells Using an Altered, Non-infectious Virus (AAV) as a "Shuttle"Hemophilia A
ACTIVE NOT_RECRUITING11 Analytics
PHASE1ACTIVE NOT_RECRUITING
Study to Test the Safety and How Well Patients With Severe Hemophilia A Respond to Treatment With BAY 2599023 (DTX 201), a Drug Therapy That Delivers a Healthy Version of the Defective Factor VIII Gene Into the Nucleus of Liver Cells Using an Altered, Non-infectious Virus (AAV) as a "Shuttle"
Hemophilia AUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of patients with adverse events (AEs), treatment-emergent adverse events (TEAEs), serious adverse events (SAEs) and AEs/SAEs of special interest
Up to 5 years.

Secondary Endpoints

Expression pattern of FVIII activity.
Up to 5 years
Proportion of patients in the respective dose step, that reached an expression of FVIII above 5%
At 6 months and 12 months following the IV administration of BAY2599023
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
BAY2599023 / (DTX201)EXPERIMENTALAdult patients with severe hemophilia A, who have been previously treated with FVIII products

Interventions

NameTypeDescription
BAY2599023 (DTX201)DRUGSingle escalating doses with 4 dose steps; Single intravenous (IV) administration.
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Eligibility Criteria

Age Range18 Years to N/A
SexMALE
Healthy VolunteersNo
Study Sites13

Inclusion Criteria: * Males age 18 years or older. * Confirmed diagnosis of hemophilia A as evidenced by their medical history with plasma FVIII activity levels \< 1% of normal or at screening. * Have \>150 exposure days (EDs) to FVIII concentrates (recombinant or plasma-derived). If on prophylaxi...

Countries:United StatesBulgariaFranceGermanyNetherlandsUnited Kingdom
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Recent Changes (Last 90 Days)

LOWJul 6, 2026NCT03588299lastUpdatePostDate: changed
LOWJul 6, 2026NCT03588299lastUpdatePostDate: changed

Frequently asked questions about BAY2599023

What is BAY2599023 used for?

BAY2599023 is an investigational small molecule being developed for the treatment of hemophilia A. It is currently in Phase 1 clinical development and is not yet approved by regulatory authorities. The drug is designed to deliver a healthy version of the defective factor VIII gene into liver cells using an altered, non-infectious virus as a shuttle.

What does BAY2599023 target?

BAY2599023 targets the factor VIII gene, delivering a healthy copy into the nucleus of liver cells using an adeno-associated virus (AAV) vector. This approach aims to address the underlying genetic defect in hemophilia A, a condition characterized by deficient or defective factor VIII protein.

Who makes BAY2599023?

BAY2599023 is being developed by Bayer AG, a multinational pharmaceutical company. Bayer's stock is traded over-the-counter under the ticker symbol BAYRY. The drug is currently in Phase 1 clinical trials for hemophilia A.

What phase is BAY2599023 in?

BAY2599023 is in Phase 1 clinical development. It is an investigational drug and has not been approved by the FDA or any other regulatory agency. The ongoing Phase 1 trial is active but not recruiting participants, and the drug remains in early-stage clinical testing.

What clinical trials is BAY2599023 in?

BAY2599023 is being studied in one Phase 1 clinical trial with the identifier NCT03588299. This trial is testing the safety and response to treatment in patients with severe hemophilia A. The study is active but not recruiting, with an enrollment of 11 male participants aged 18 years and older.

Is BAY2599023 the same as DTX201?

Yes, BAY2599023 is also known as DTX201. The drug is referred to by both names in clinical research, with the Phase 1 trial title using the designation BAY 2599023 (DTX 201). Both names refer to the same investigational therapy for hemophilia A.