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UX016

Phase 1

GNE Myopathy | Small molecule | Rare Disease |Ultragenyx Pharmaceutical Inc.|Trials Updated: Oct 13, 2026

UX016 development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Apr 2026

UX016 target and mechanism

Molecular targetsialic acid
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment24

FDA Designations

No designations recorded

UX016 clinical trials

UX016 · 1 trial · 1 indication

Phase 1 1
NCT07511556First-in-human Study of UX016 in GNEMGNE Myopathy
RECRUITING24 Analytics
PHASE1RECRUITING
First-in-human Study of UX016 in GNEM
GNE MyopathyUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of Participants with Treatment-Emergent Adverse Events (TEAEs)
Up to Week 96 (Double Blind and Extension Periods)
Upper Extremity Composite (UEC) Score Change From Baseline
Baseline, 48 Weeks

Secondary Endpoints

Plasma Area Under the Curve (AUC) of UX016 and Free Sialic Acid (SA)
Baseline, 12 Weeks
Plasma Maximum Concentration (Cmax) of UX016 and SA
Baseline, 12 Weeks
Excretion in Urine of UX016 and SA
Baseline, 12 Weeks
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
1g UX016 -> Extension PeriodEXPERIMENTALParticipants will be randomized 3:1 to receive UX016 or placebo. Depending on sub-cohort assignment, participants may receive two single doses of UX016 (0.5g and 1g) or one single dose (1g) before starting daily dosing, or they may proceed directly to daily dosing at the assigned 1g dose level. After completing 48 weeks of daily dosing, participants will be eligible to enter the Extension Period, during which all participants will receive UX016.
2g UX016 -> Extension PeriodEXPERIMENTALParticipants will be randomized 3:1 to receive UX016 or placebo. Depending on sub-cohort assignment, participants may receive a single dose of UX016 (2g) before starting daily dosing, or they may proceed directly to daily dosing at the assigned 2g dose level. After 48 weeks of daily dosing, participants will be eligible to enter the Extension Period, during which all participants will receive UX016.
Placebo -> Extension PeriodPLACEBO_COMPARATORParticipants will be randomized 3:1 to receive UX016 or placebo. Depending on sub-cohort assignment, participants may receive one or more single doses of placebo before starting daily dosing or they may proceed directly to daily dosing of placebo at the assigned dose level. After 48 weeks of daily dosing of placebo, participants will be eligible to enter the Extension Period, during which all participants will receive UX016.

Interventions

NameTypeDescription
UX016DRUGTablets for oral use
PlaceboOTHERTablets for oral use. Tablets will match the UX016 tablets, but contain no active ingredients
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Eligibility Criteria

Age Range18 Years to 55 Years
SexALL
Healthy VolunteersNo
Study Sites2

Inclusion Criteria: * A confirmed diagnosis of GNEM (also known as distal myopathy with rimmed vacuoles \[DMRV\], hereditary inclusion body myopathy \[HIBM\], inclusion body myopathy 2 \[IBM2\], and Nonaka myopathy in Japan) by Clinical Laboratory Improvement Amendments (CLIA)-certified genetic tes...

Countries:United States
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Competitive Landscape -Arrhythmogenic Right Ventricular Cardiomyopathy 3 trials (matched to "GNE Myopathy")

CompanyTickerTrialsLead PhaseDrugs
Lexeo Therapeutics, Inc.LXEO3PHASE1LX2020
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Recent Changes (Last 90 Days)

LOWOct 13, 2026NCT07511556lastUpdatePostDate: changed
LOWOct 13, 2026NCT07511556lastUpdatePostDate: changed
LOWSep 3, 2026NCT07511556Status: NOT_YET_RECRUITING → RECRUITING
LOWSep 3, 2026NCT07511556Status: NOT_YET_RECRUITING → RECRUITING

Frequently asked questions about UX016

What is UX016 used for?

UX016 is an investigational small molecule being developed for the treatment of GNE Myopathy, a rare genetic disorder. It is currently in Phase 1 clinical development and has not been approved by regulatory authorities.

What does UX016 target?

UX016 targets sialic acid, a molecule involved in cellular processes. By modulating sialic acid, the drug aims to address the underlying deficiency associated with GNE Myopathy, though its exact mechanism is still under investigation in clinical trials.

Who is developing UX016?

UX016 is being developed by Ultragenyx Pharmaceutical Inc., a biopharmaceutical company focused on rare diseases. The company's stock is traded under the ticker symbol RARE on the NASDAQ exchange.

What phase is UX016 in?

UX016 is currently in Phase 1 clinical development. It is an investigational drug and has not yet received regulatory approval. The ongoing Phase 1 trial is designed to evaluate the drug's safety, tolerability, and pharmacokinetics in patients with GNE Myopathy.

What clinical trials is UX016 in?

UX016 is being studied in a Phase 1 first-in-human trial with the identifier NCT07511556. This randomized, double-blind, placebo-controlled study is recruiting approximately 24 adult participants with GNE Myopathy in the United States.

Is UX016 the same as any other drug?

No alternative names for UX016 have been disclosed. It is identified solely by its development code UX016 and is being investigated as a distinct therapeutic candidate for GNE Myopathy.