NT-I7, a Long-Acting Recombinant IL-7 Molecule, as an Immune Reconstitution Strategy for Lymphopenia in Patients With Progressive Multifocal Leukoencephalopathy
- Registration Number
- NCT04781309
- Brief Summary
Background:
Progressive multifocal leukoencephalopathy (PML) is a brain infection. It is caused by a virus. PML can happen in people with a weakened immune system. PML is associated with cognitive and visual impairment as well as motor and speech disturbances. There is no treatment for PML. Researchers want to see if a new drug can help.
Objective:
To see if the drug NT-I7 can help increase lymphocyte numbers, which may help control PML infection.
Eligibility:
Adults ages 18 and older with PML who are enrolled in Protocol #13-N-0017.
Design:
Participants will be screened under Protocol #13-N-0017.
Participants will have a 7-day inpatient stay, outpatient visits, and follow-up phone calls.
Participants will have a medical history and physical exam. They will give urine samples. Blood will be drawn from an arm vein or through an intravenous (IV) catheter.
Participants will get up to 3 doses of NT-I7. It will be given by injection into the muscle.
Participants will have lumbar punctures ( spinal taps ). A thin needle will be inserted into the spinal canal in the lower back. Cerebrospinal fluid will be removed. X-ray may be used to guide the procedure.
Participants will have magnetic resonance imaging (MRI) of the brain. The MRI scanner is a metal cylinder surrounded by a magnetic field. During MRIs, participants will lie on a table that slides in and out of the scanner. Soft padding or a coil will be placed around their head. They will get gadolinium, a contrast agent, through an IV catheter.
Participation will last for 12 to 19 months.
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- Detailed Description
Study Description:
This protocol will test whether NT-I7 is a viable strategy for promoting immune reconstitution in lymphopenic patients with PML. Twelve adults with PML and lymphopenia (CD4 or CD8 T cell count of \<=200 cells/dL), without a history of autoimmune disease affecting vital organs, will complete this pilot study. Patients will be observed as inpatient for the first 7 days following any experimental drug dosing. To follow, patients will return to NIH for a second 7-day inpatient stay by Day 21, and then for scheduled outpatient visits at NIH at month 2, 3, 6, 9 and 12 following any drug dosing. Follow up phone calls will be conducted at month 4, 5, 7 and 8. Patients may be eligible for a second dose of NT-I7 at higher dose if target ALC (1000/microliter) not reached, or at same dose if initial response is adequate but not sustained, for a maximum of 3 doses. The primary outcome measure is change in absolute lymphocyte counts (ALC). Secondary outcomes include safety and tolerability. Exploratory clinical, radiological, and laboratory measures will be obtained to investigate mechanism of action of NT-I7 and for biomarker development.
Objectives:
Primary Objective: To determine the kinetics and magnitude of effect of NT-I7 on absolute lymphocyte counts in patients with PML and underlying lymphopenia from various causes, in order to inform appropriate design of a future study.
Secondary Objectives: (1) To assess safety and tolerability of NT-I7. (2) To determine kinetics and magnitude of effect of NT-I7 on lymphocyte subsets. (3) To investigate effect of NT-I7 on PML disease course. (4) To investigate mechanism of action of NT-I7.
Endpoints:
Primary Endpoint: Change in absolute lymphocyte counts (ALC) over 6 months.
Secondary Endpoints: (1) Adverse event tables. (2) Change in lymphocyte subset counts, including CD4, CD8 and CD19 positive cells (3) Change in standardized disability rating scales, PML lesion extension by brain MRI, viral quantification in CSF and survival. (4) Exploratory serological and CSF measures to investigate immune response to JCV and mechanism of action of NT-I7.
Recruitment & Eligibility
- Status
- RECRUITING
- Sex
- All
- Target Recruitment
- 12
Not provided
Not provided
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- SINGLE_GROUP
- Arm && Interventions
Group Intervention Description NT-I7 NT-I7 480 microgram/kg IM (initial dose)
- Primary Outcome Measures
Name Time Method the longitudinal change in absolute lymphocyte count over 6 months following study drug administration over 6months following study drug administration determine the kinetics and magnitude of effect of NT-I7 on absolute lymphocyte counts (ALC) in patients with PML and underlying lymphopenia from various causes, in order to inform appropriate design of a future study
- Secondary Outcome Measures
Name Time Method Change in lymphocyte subsets, including CD4, CD8, and CD19 positive cells at each study timepoint These values will be investigated first descriptively at each timepoint using mean and SD or median and IQR, and then graphically. Key comparisons of interest will include baseline to Month 3 and baseline to Month 6.
Disease course at each study timepoint These endpoints include quantification of JCV DNA in CSF and blood, change in Modified Rankin Scale score, change in Karnofsky Performance Scale score, change in PML lesion extension, change in pattern of contrast enhancement by brain MRI and survival. Key comparisons of interest will include baseline to Month 3 and baseline to Month 6. Here, the goal is to provide some initial proof of principle that the disease course is being impacted in a measurable way, particularly beyond Month 3.
Safety at each study timepoint assessed by the occurrence of treatment-related adverse events. These adverse events will be tabulated separately by timepoint to identify any trends in the data and will be described using number and percent.
Trial Locations
- Locations (1)
National Institutes of Health Clinical Center
🇺🇸Bethesda, Maryland, United States