Treatment of Charcot-Marie-Tooth Disease, Axonal, Type 2S (CMT2S) in an Individual Patient

August 17, 2026 updated by: Vanda Pharmaceuticals

The Treatment of Charcot-Marie-Tooth Disease, Axonal, Type 2S (CMT2S) in an Individual Patient With Confirmed IGHMBP2 Intronic Cryptic Splice Variant C. 1235+894C>A That is Amenable to Antisense Oligonucleotide (ASO)-Mediated Correction of IGHMBP2 Splicing

This is an 'N of 1', open-label, single center study to evaluate the safety of therapy with VCA-894A, an ASO designed to rescue and restore the activity of IGHMBP2, when administered by intrathecal injection.

Study Overview

Status

Active, not recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

1

Phase

  • Phase 2
  • Phase 1

Contacts and Locations

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

Study Locations

  • United States
    • Wisconsin
      • Madison, Wisconsin, United States, 53792
        • Vanda Investigational Site

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
  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Ability and acceptance to provide written informed consent.
  • Genetically confirmed diagnosis of CMT2S with confirmed IGHMBP2 intronic cryptic splice variant c. 1235+894C>A.

Exclusion Criteria:

  • Significant clinical deterioration of the patient's neurologic status, as judged by the Investigator.
  • Non-reversible conditions that are contraindications to lumbar puncture.
  • Pregnancy, recent pregnancy (within 6 weeks), or women who are breastfeeding.

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: VCA-894A
Drug: VCA-894A
intrathecal antisense oligonucleotide injection

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Assessment of safety of therapy with VCA-894A when administered via intrathecal injection, as measured by the incidence of adverse events.
Time Frame: 631 days
Safety will be assessed by determining the incidence, severity, and dose relationship of adverse events that are related to treatment with VCA-894A.
631 days
Assessment of CMT2S symptoms following chronic administration of intrathecal VCA-894A, as determined by the change in the Revised Upper Limb Module for Spinal Muscular Atrophy (RULM).
Time Frame: 631 days
The Revised Upper Limb Module for Spinal Muscular Atrophy (RULM) scores range from a minimum of 0 to a maximum of 37 points, with higher scores indicating better upper limb function.
631 days
Assessment of CMT2S symptoms following chronic administration of intrathecal VCA-894A, as determined by the change in the Hammersmith Functional Motor Scale - Expanded (HFMSE).
Time Frame: 631 days
The Hammersmith Functional Motor Scale - Expanded (HFMSE) scores range from a minimum of 0 to a maximum of 66 points, with higher scores indicating greater motor functioning.
631 days

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Rescue of IGHMBP2, as determined by the change in IGHMBP2 mRNA expression from baseline.
Time Frame: 631 days
IGHMBP2 mRNA, which is the target of VCA-894A therapy, will be measured in both the cerebrospinal fluid (CSF) and blood by qPCR relative expression.
631 days

Collaborators and Investigators

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

Sponsor

Vanda Pharmaceuticals

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.

General Publications

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 (Actual)

May 13, 2025

Primary Completion (Estimated)

March 1, 2027

Study Completion (Estimated)

March 1, 2027

Study Registration Dates

First Submitted

October 27, 2025

First Submitted That Met QC Criteria

October 30, 2025

First Posted (Actual)

November 3, 2025

Study Record Updates

Last Update Posted (Actual)

August 19, 2026

Last Update Submitted That Met QC Criteria

August 17, 2026

Last Verified

August 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • VP-VCA-894A-2101

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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