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Central Nervous System Uptake of Anti-CD8+ T Cell Minibodies in Multiple Sclerosis and Progressive Multifocal Leukoencephalopathy

NCT05849467 · Status: RECRUITING · Phase: PHASE1 · Type: INTERVENTIONAL · Enrollment: 15

Last updated 2026-05-07

No results posted yet for this study

Summary

Background:

Multiple sclerosis (MS) and progressive multifocal leukoencephalopathy (PML) are disorders that affect the central nervous system (CNS). The CNS includes the brain, spinal cord, and optic nerves. Both diseases can cause muscle weakness and impair vision, speech, and coordination. Researchers are working to better understand how MS and PML affect the CNS.

Objective: To test whether an experimental radioactive tracer (minibody) can help positron emission tomography (PET) scans detect certain immune cells in the CNS of people with MS and PML.

Eligibility:

People aged 18 years and older with MS, other neuroinflammatory diseases with BBB leakage, or PML.

Design:

Participants will come to the clinic for at least 3 visits over 4 to 6 weeks.

Participants will undergo testing. They will have a physical and neurological exam. They will have blood tests and tests of their heart function. They will have a magnetic resonance imaging (MRI) scan of the brain. They may have a spinal tap: Their lower back will be numbed, and a needle will be inserted between the bones of the spine to withdraw fluid from around the spinal cord.

Minibody is given through a tube with a needle placed in a vein in the arm. This takes 5 to 10 minutes. Participants will have heart function tests before and after receiving the minibody.

Participants may have a PET scan on the day of the Minibody and will return the next day for another PET scan. They will lie on a table that moves through a doughnut-shaped machine. This scan will take about 1 hour.

Participants with PML may opt to repeat the minibody infusion and the PET scan within 6 months.

Conditions

  • Progressive Multifocal Leukoencephalopathy
  • Multiple Sclerosis
  • Other Neuroinflammatory Diseases With BBB Leakage

Interventions

DRUG

89 Zr-Df-crefmirlimab

an 80 kDa minibody (Mb) with high affinity to CD8 glycoprotein (binding EC50 = 0.4 nM) that is conjugated with deferoxamine (Df) and radiolabeled with the positron emitting radionuclide, Zr-89 (T1/2 78.4 hours).

Sponsors & Collaborators

  • National Institute of Neurological Disorders and Stroke (NINDS)

    lead NIH

Principal Investigators

  • Daniel S Reich, M.D. · National Institute of Neurological Disorders and Stroke (NINDS)

Study Design

Allocation
NA
Purpose
TREATMENT
Masking
NONE
Model
SINGLE_GROUP

Eligibility

Min Age
18 Years
Max Age
120 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2023-10-19
Primary Completion
2030-04-01
Completion
2030-12-01
FDA Drug
Yes

Countries

  • United States

Study Locations

More Related Trials

Entities

Diseases

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT05849467 on ClinicalTrials.gov