A Study to Assess the Correct Dose, Safety and Efficacy of Empasiprubart in Adolescent Participants Aged 12 to Less Than 18 Years With Chronic Inflammatory Demyelinating Polyradiculoneuropathy (emlight)

June 5, 2026 updated by: argenx

An Open-Label Study to Evaluate the Pharmacokinetics, Pharmacodynamics, Safety, and Activity of Empasiprubart in Adolescent Participants Aged 12 to Less Than 18 Years With Chronic Inflammatory Demyelinating Polyradiculoneuropathy

The main purpose of the study is to determine the correct dose of empasiprubart in adolescent participants. It also aims to evaluate if empasiprubart may work and how safe it is for the use in children living with CIDP.

The study consists of an open label treatment phase where participants will receive empasiprubart for up to 27 months approximately. After the final dose of empasiprubart, participants will enter a safety follow-up period for up to 14 months approximately.

The overall study duration for each participant is up to 43 months.

More information can be found here: clinicaltrials.argenx.com/emlight

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

6

Phase

  • Phase 2
  • Phase 3

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Is aged 12 to <18 years.
  • Meets criteria for CIDP based on EAN/PNS Task Force CIDP guidelines, second revision (2021).
  • Has a diagnosis of either typical CIDP or 1 of the following CIDP variants: motor CIDP (including motor-predominant CIDP), multifocal CIDP (also known as Lewis-Sumner syndrome), focal CIDP, or distal CIDP.

Exclusion Criteria:

  • Possible CIDP based on EAN/PNS Task Force CIDP guidelines, second revision (2021).
  • Sensory CIDP (including sensory-predominant CIDP).
  • Besides the indication under study, known autoimmune disease or any medical condition that would interfere with an accurate assessment of clinical symptoms of CIDP, or that puts the participant at undue risk.
  • Prior use of other long-acting immunomodulatory treatment.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Empasiprubart IV
Participants will receive empasiprubart IV
Biological: Empasiprubart IV
Intravenous infusions of empasiprubart

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Empasiprubart serum concentrations as input for a population PK-driven analysis to determine the effect of age and body size on CL and Vd
Time Frame: Up to 8 weeks
CL = Clearance; Vd = apparent volume of distribution.
Up to 8 weeks
Free and total C2 levels as input for PK/PD modeling analysis
Time Frame: Up to 8 weeks
C2 = complement component 2.
Up to 8 weeks

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Incidence of AEs, SAEs and AESIs
Time Frame: Up to 180 weeks
AE = Adverse event ; SAE = Serious adverse event ; AESI = Adverse event of special interest.
Up to 180 weeks
Empasiprubart serum concentrations over time
Time Frame: Up to 180 weeks
Up to 180 weeks
Percentage reductions from baseline of free and total C2 levels over time
Time Frame: Up to 180 weeks
C2 = complement component 2.
Up to 180 weeks
Incidence of ADA and NAb against empasiprubart in serum
Time Frame: Up to 180 weeks
ADA = antidrug antibody(ies); NAb = neutralizing antibody(ies).
Up to 180 weeks

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

argenx

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

Helpful Links

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

September 1, 2026

Primary Completion (Estimated)

April 1, 2028

Study Completion (Estimated)

August 1, 2031

Study Registration Dates

First Submitted

June 5, 2026

First Submitted That Met QC Criteria

June 5, 2026

First Posted (Actual)

June 10, 2026

Study Record Updates

Last Update Posted (Actual)

June 10, 2026

Last Update Submitted That Met QC Criteria

June 5, 2026

Last Verified

June 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • ARGX-117-6-CIDP-2001
  • 2025-524153-14-00 (Ctis)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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