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ARGX-109

Phase 1

Undisclosed | Monoclonal antibody | Other |argenx SE|Trials Updated: Sep 18, 2025

ARGX-109 development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Jan 2025

ARGX-109 target and mechanism

Molecular targetIL-6
Target classCytokine
ModalityMonoclonal antibody

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment40

FDA Designations

No designations recorded

ARGX-109 clinical trials

ARGX-109 · 1 trial · 1 indication

Phase 1 1
NCT06799416A Study to Assess the Safety of ARGX-109 in Healthy VolunteersHealthy Volunteer
COMPLETED40 Analytics
PHASE1COMPLETED
A Study to Assess the Safety of ARGX-109 in Healthy Volunteers
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Study Endpoints

Primary Endpoints

Incidence of AEs, SAEs and AEs leading to discontinuation
up to 16 weeks

AE: adverse event, SAE: serious adverse event

Secondary Endpoints

Cmax
up to 16 weeks
Total IL-6 serum concentrations
up to 16 weeks
Incidence of ADA against ARGX-109 in serum
up to 16 weeks
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Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
ARGX-109EXPERIMENTALParticipants receiving the experimental drug
PlaceboPLACEBO_COMPARATORParticipants receiving placebo

Interventions

NameTypeDescription
ARGX-109BIOLOGICALadministrations of ARGX-109
PlaceboOTHERadministrations of placebo comparator
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Eligibility Criteria

Age Range18 Years to 65 Years
SexALL
Healthy VolunteersYes
Study Sites1

Inclusion Criteria: * is aged 18 to 65 years, inclusive, when signing the ICF * has a body weight between 50 and 100 kg and a BMI between 18.5 and 30.0 kg/m2, inclusive Exclusion Criteria: * Has any current or past clinically meaningful medical or psychiatric condition that, in the investigator's...

Countries:Canada
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Frequently asked questions about ARGX-109

What is ARGX-109?

ARGX-109 is an investigational monoclonal antibody developed by argenx SE. It has been studied in a Phase 1 clinical trial in healthy adult volunteers in Canada. No approved indication has been announced for ARGX-109, and it remains in early clinical development.

What does ARGX-109 target?

ARGX-109 targets interleukin-6, or IL-6, a cytokine. By binding IL-6, the antibody is designed to interfere with IL-6 mediated signaling. IL-6 is a signaling protein involved in inflammatory and immune processes, which is why it is a target of interest for antibody therapeutics.

Who makes ARGX-109?

ARGX-109 is developed by argenx SE, a biotechnology company listed on the Nasdaq under the ticker ARGX. Argenx is the sponsor of the clinical program for ARGX-109.

What phase is ARGX-109 in?

ARGX-109 is in Phase 1 development. It is investigational and has not been approved by the FDA. The Phase 1 program consists of one completed trial, and no active trials are currently listed for ARGX-109.

What clinical trials is ARGX-109 in?

ARGX-109 has been evaluated in one clinical trial, NCT06799416, titled A Study to Assess the Safety of ARGX-109 in Healthy Volunteers. The Phase 1 trial was completed, enrolled 40 healthy adult participants in Canada, and used a randomized, double-blind, placebo-controlled design.