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ZL-1109

Phase 3

Thyroid Eye Disease (TED) | Small molecule | Endocrine |Zai Lab Limited|Last Updated: Dec 29, 2025

Target and mechanism

ModalitySmall molecule

Also known as ZL-1109 (VRDN-003)

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment99

FDA Designations

No designations recorded

Clinical trial landscape

ZL-1109 · 1 trial · 1 indication

Phase 3 1
NCT07211776A Study to Assess the Efficacy and Safety of ZL-1109 in Chinese Participants With Active Thyroid Eye DiseaseThyroid Eye Disease (TED)
RECRUITING99 Analytics
PHASE3RECRUITING
A Study to Assess the Efficacy and Safety of ZL-1109 in Chinese Participants With Active Thyroid Eye Disease
Thyroid Eye Disease (TED)Unlock trial analytics

Study Endpoints

Primary Endpoints

Proptosis Responder Rate in the study eye
At Week 24

Proportion of participants with a ≥2 mm reduction from baseline in proptosis in the study eye \[without a corresponding increase of ≥2 mm in the fellow eye\]

Secondary Endpoints

Change from baseline in proptosis in the study eye
At Week 24
Overall Responder Rate in the study eye
At Week 24
Change from baseline in Clinical Activity Score (CAS) in the study eye
At Week 24
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Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Randomized controlled period: ZL-1109 every 4 weeksEXPERIMENTALParticipants will receive ZL-1109 per protocol defined dosing regimen.
Randomized controlled period: ZL-1109 every 8 weeksEXPERIMENTALParticipants will receive ZL-1109 and placebo per protocol defined dosing regimen.
Randomized controlled period: Placebo every 4 weeksPLACEBO_COMPARATORParticipants will receive placebo per protocol defined dosing regimen.
OLE treatment period: ZL-1109 every 4 weeksOTHERParticipants who not responded would receive ZL-1109 per protocol defined dosing regimen.

Interventions

NameTypeDescription
ZL-1109 (VRDN-003)DRUGZL-1109 subcutaneous injection
PlaceboDRUGMatching placebo subcutaneous injection
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Eligibility Criteria

Age Range18 Years to 75 Years
SexALL
Healthy VolunteersNo
Study Sites27

Key Inclusion Criteria: 1. Have moderate to severe TED 2. Must meet the clinical diagnosis criteria of active TED 3. Must agree to use highly effective contraception as specified in the protocol 4. Female TED participants must have a negative serum pregnancy test at screening Key Exclusion Criteri...

Countries:China
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Frequently asked questions about ZL-1109

What is ZL-1109 used for?

ZL-1109 is an investigational small molecule being developed for the treatment of Thyroid Eye Disease (TED), a condition affecting the tissues around the eyes. It is currently in Phase 3 clinical development and has not been approved by regulatory authorities.

Who makes ZL-1109?

ZL-1109 is being developed by Zai Lab Limited, a biopharmaceutical company listed on the NASDAQ under the ticker symbol ZLAB. The company is conducting clinical trials for this investigational drug in China.

What phase is ZL-1109 in?

ZL-1109 is in Phase 3 clinical development. It is an investigational drug, meaning it has not yet been approved by regulatory authorities for the treatment of Thyroid Eye Disease. The ongoing Phase 3 trial is currently recruiting participants.

What clinical trials is ZL-1109 in?

ZL-1109 is being evaluated in a Phase 3 clinical trial with the identifier NCT07211776. This randomized, double-blind, placebo-controlled study is assessing the efficacy and safety of ZL-1109 in Chinese participants with active Thyroid Eye Disease. The trial is currently recruiting and aims to enroll 99 participants.

Is ZL-1109 the same as VRDN-003?

Yes, ZL-1109 is also known as VRDN-003. Both names refer to the same investigational drug being developed by Zai Lab Limited for the treatment of Thyroid Eye Disease.