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YB-101

Phase 2

Graves' Disease | Small molecule | Endocrine |Yarrow Bioscience, Inc. Common Stock|Trials Updated: Oct 30, 2026

YB-101 target and mechanism

Molecular targetTSHR
Target classAntibody
ModalitySmall molecule

Also known as Experimental: YB-101

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment232

FDA Designations

No designations recorded

YB-101 clinical trials

YB-101 · 1 trial · 1 indication

Phase 2 1
NCT07682896Evaluation of YB-101 for Safety, Tolerability, Pharmacokinetics, and Efficacy in Graves' DiseaseGraves' Disease
RECRUITING232 Analytics
PHASE2RECRUITING
Evaluation of YB-101 for Safety, Tolerability, Pharmacokinetics, and Efficacy in Graves' Disease
Graves' DiseaseUnlock trial analytics

Study Endpoints

Primary Endpoints

Type and frequency of treatment-emergent adverse events (TEAEs) and treatment-emergent serious adverse events (TESAEs)
Baseline, Day 169
Proportion of participants with normal free triiodothyronine (FT3), free thyroxine (FT4), and thyroid-stimulating hormone (TSH) who discontinued anti-thyroid drugs (ATDs), regardless of concomitant levothyroxine use
Baseline, Day 169
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Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
YB-101EXPERIMENTALIn Part 1, participants will receive YB-101 via subcutaneous injection. Part 2 participants will receive YB-101 via subcutaneous injection.
Placebo YB-101PLACEBO_COMPARATORIn Part 1, participants will receive placebo via subcutaneous injection. Part 2 participants will receive placebo via subcutaneous injection.

Interventions

NameTypeDescription
Experimental: YB-101DRUGYB-101 is administered over a 24 week period.
Placebo YB-101DRUGPlacebo will be administered over a 24 week period.
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites32

Inclusion Criteria: * Have a documented diagnosis of Graves' Disease confirmed by the presence of thyroid-stimulating hormone receptor antibodies (TRAbs) by medical history or screening laboratory assessment * Have a pre-existing diagnosis of TED or, conversely, no evidence of TED at the ophthalmol...

Countries:United StatesAustralia
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Recent Changes (Last 90 Days)

LOWOct 30, 2026NCT07682896lastUpdatePostDate: changed
LOWOct 30, 2026NCT07682896lastUpdatePostDate: changed
LOWOct 5, 2026NCT07682896lastUpdatePostDate: changed
LOWOct 5, 2026NCT07682896lastUpdatePostDate: changed
LOWSep 4, 2026NCT07682896lastUpdatePostDate: changed
LOWSep 4, 2026NCT07682896lastUpdatePostDate: changed

Frequently asked questions about YB-101

What is YB-101?

YB-101 is an investigational small molecule being developed by Yarrow Bioscience, Inc. for the treatment of Graves' Disease, an endocrine condition. It is currently in Phase 2 clinical development and has not been approved by the FDA. YB-101 is also referred to in study materials as Experimental: YB-101.

What is YB-101 used for in Graves' Disease?

YB-101 is being evaluated as a treatment for Graves' Disease, an autoimmune endocrine disorder. It is an investigational therapy in Phase 2 testing and is not yet approved for any indication. The ongoing trial is assessing its safety, tolerability, pharmacokinetics, and efficacy in adults with the condition.

What does YB-101 target?

YB-101 targets TSHR, the thyroid-stimulating hormone receptor. TSHR belongs to the antibody target class. By acting on this receptor, YB-101 is designed to interfere with the receptor pathway implicated in Graves' Disease. The drug is a small molecule in Phase 2 development.

Who is developing YB-101?

YB-101 is being developed by Yarrow Bioscience, Inc., which trades under the ticker YARW. The company is running a Phase 2 clinical program for the drug in Graves' Disease. Yarrow Bioscience is the sole developer listed for this asset.

What phase is YB-101 in?

YB-101 is in Phase 2 clinical development. It is an investigational drug and has not been approved by the FDA. The Phase 2 trial is currently recruiting participants and is designed to evaluate safety, tolerability, pharmacokinetics, and efficacy in Graves' Disease.

What clinical trials is YB-101 in?

YB-101 is being studied in one active clinical trial, NCT07682896, titled Evaluation of YB-101 for Safety, Tolerability, Pharmacokinetics, and Efficacy in Graves' Disease. The Phase 2 trial is recruiting 232 participants across the United States and Australia. It is randomized, double-blind, and placebo-controlled, enrolling adults 18 years and older.