IL-2 Plus Abatacept in FTD

A Phase I Clinical Trial, Using Interleukin-2 (IL-2) and Abatacept in Patients with Frontotemporal Disorders

Neuroinflammation is a significant component of Frontotemporal Disorder (FTD). Our preliminary unpublished data demonstrated that regulatory T cells (Tregs) have a compromised phenotype and reduced suppressive function in FTD patients, skewing the immune system toward a proinflammatory status and potentially contributing to disease progression. Low dose interleukin-2 (IL-2) is now viewed as a very promising immunoregulatory drug with the capacity to selectively expand and restore functional Tregs. Our preclinical data also demonstrated synergistic effect of interleukin-2 and abatacept (CTLA4-IgG) in remodeling immunologic pathways. Abatacept is an FDA approved medication that has been indicated as a monotherapy or concomitantly with other anti-inflammatory drugs to modulate inflammation in autoimmune disorders. This study is a phase I, open-label study to assess safety and tolerability of low dose IL-2 plus abatacept immunotherapy in FTD individuals. In the first part of this study, 5 FTD patients will be recruited. These five individuals will receive subcutaneous abatacept (125 mg) followed by five-day-courses of IL-2 (1MUI/day) every four weeks for a total of 21 weeks (part-1 of the study). If the treatment strategy is safe and well-tolerated, up to 5 additional FTD subjects will be recruited to receive subcutaneous abatacept (125 mg) followed by five-day-courses of IL-2 (1MUI/day) every two weeks for a total of 21 weeks (part 2 of the study).

Study Overview

• Status: Recruiting
• Conditions: Frontotemporal Degeneration
• Intervention / Treatment: Drug: Abatacept plus Aldesleukin

• Study Type: Interventional
• Enrollment (Estimated): 10
• Phase: Phase 1

Contacts and Locations

• Study Contact: Name: Maria B Pascual; Email: bpascual@houstonmethodist.org
• Study Contact Backup: Name: Alireza Faridar; Phone Number: 2814131431; Email: faridar99@yahoo.com

Study Locations

• United States
  • Texas
    • Houston, Texas, United States, 77030
      • Recruiting
      • Houston Methodist Research Institute
      • Contact: Alireza Faridar; Phone Number: 7134411150; Email: afaridar@houstonmethodist.org
      • Contact: Maria B Pascual; Email: bpascual@houstonmethodist.org

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

1. Diagnosis of probable frontotemporal dementia
2. Male or female age 18 to 86 years
3. If on medications affecting cognition or behaviors (Such as Atypical Antipsychotics, Acetyl Choline Esterase inhibitors), participants must be on stable dosage for at least 4 weeks prior to screening and should remain at a stable dosage during the course of the study. There are no prohibited medications preventing patients from participating in the study.
4. English language speaking
5. Formal education of eight or more years
6. Stable pharmacological treatment of any other chronic conditions for at least 30 days prior to screening
7. A family member or caretaker (study partner) who is expected to be consistently available, administer study drugs of IL-2/abatacept and attend study visits throughout the study. The study partner is also supposed to provide feedback on patient's cognitive and functional status. In the event that the designated study partner is unable to continue participating in the study, the study subject should provide another suitable study partner to ensure the uninterrupted progress of the study.
8. For FTD patients with limited decision-making capacity, the legally authorized representative (LAR) should be present in the decision-making process and trial participation, ensuring they understand the potential risks and benefits, and consent based on the patient's best interest. Extended time for consent will also be considered to ensure comprehension.

Exclusion Criteria:

1. Serious, active bacterial, fungal or viral infection, active or latent tuberculosis
2. History of severe pulmonary dysfunction
3. History of severe cardiac dysfunction defined as left ventricular ejection fraction <40%; a history of non-controlled cardiac arrhythmias; history of cardiac tamponade; Unstable angina or MI in the last 3 months
4. Hypersensitivity or allergy to IL-2 or abatacept
5. History of bowel ischemia/perforation, or GI bleeding requiring surgery
6. Hospitalization or change of chronic concomitant medication within one month prior to screening.
7. History of hemorrhage or infarct or > 3 lacunar infarcts, encephalomalacia, aneurysm, vascular malformation, subdural hematoma, space-occupying lesion (e.g. abscess or brain tumor with the exception of small incidental meningiomas) in prior CT or MRI.

8. Clinical or laboratory findings consistent with:

   1. Other primary degenerative dementia, (dementia with Lewy bodies, Alzheimer's disease, Huntington's disease, Jacob-Creutzfeld Disease, Down's syndrome, Parkinson's disease, etc.)
   2. Seizure disorder
   3. History of infectious, metabolic or systemic diseases affecting the central nervous system (syphilis, Lyme disease, other laboratory values, etc.)

9. Clinically significant, advanced, or unstable disease that may interfere with outcome evaluations, such as:

   1. Respiratory insufficiency
   2. Bradycardia (<45/min.) or tachycardia (>100/min.)
   3. Poorly managed hypertension (systolic >180 mm Hg and/or diastolic >100 mm Hg) or hypotension (systolic <90 mm Hg and/or diastolic <60 mm Hg)
   4. Uncontrolled diabetes defined by HbA1c >8%
   5. Alanine aminotransferase level (ALT) and aspartate aminotransferase (AST) higher than two times normal
   6. Serum creatinine higher than 2 mg/dL
   7. Neutrophil count <1,500/mm3; platelets <100,000/mm3; hematocrit (HCT) <30%.
   8. INR>1.4
10. History of cancer within 3 years of screening with the exception of fully excised non-melanoma skin cancers or non-metastatic prostate cancer that has been stable for at least 6 months.
11. History of acute/chronic hepatitis B or C and/or carriers of hepatitis B
12. Disability that may prevent the patient from completing all study requirements (e.g. blindness, deafness, etc.).
13. Suspected or known allergy to any components of the study treatments.
14. Intake of investigational drug within the previous 30 days or five half-lives of the investigational drug, whichever is longer.
15. Any condition, which in the opinion of the investigator makes the patient unsuitable for inclusion.
16. Contraindication to undergoing an LP including, but not limited to: inability to tolerate an appropriately flexed position for the time necessary to perform an LP; INR >1.4 or other coagulopathy; platelet count of <100,000/μL; infection at the desired lumbar puncture site; taking anti-coagulant medication within 90 days of screening (Note: low dose aspirin is permitted); suspected non-communicating hydrocephalus or intracranial mass; prior history of spinal mass or trauma.
17. Known to be pregnant or lactating, or positive pregnancy test at screening ; This study allows enrolling women of childbearing potential and the treatments may involve unknown risks to the fetus if pregnancy were to occur during the study. This risk is mitigated by requiring proof the participant is not pregnant prior to start of treatment and requiring highly effective contraception during and, for an appropriate interval, after treatment.
18. Lack of reliable study partner.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Non-Randomized
• Interventional Model: Sequential Assignment
• Masking: None (Open Label)

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Active Comparator: Abatacept plus Aldesleukin every 4 weeks; Subcutaneous abatacept (125 mg) followed by five-day-courses of IL-2 (1MUI/day) every four weeks will be administered for a total of 21 weeks	Drug: Abatacept plus Aldesleukin; CTLA4IgG plus Low dose Interleukin-2 (Aldesleukin) administration to modify immune responses
Active Comparator: Abatacept plus Aldesleukin every 2 weeks; Subcutaneous abatacept (125 mg) followed by five-day-courses of IL-2 (1MUI/day) every two weeks will be administered for a total of 21 weeks	Drug: Abatacept plus Aldesleukin; CTLA4IgG plus Low dose Interleukin-2 (Aldesleukin) administration to modify immune responses

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
To assess the safety and the tolerability of abatacept plus IL-2 in FTD patients	Number of participants with adverse events and with abnormal laboratory findings (serum chemistry, hematology).	6 months treatment phase

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
To investigate the impact of low dose IL-2 plus abatacept administration on the blood Treg population in FTD patients	Change in Treg percentage out of total # of CD4 cells from baseline to month 6	6 months treatment phase

Collaborators and Investigators

• Sponsor: The Methodist Hospital Research Institute

Study record dates

Study Major Dates

• Study Start (Actual): May 6, 2024
• Primary Completion (Estimated): April 30, 2026
• Study Completion (Estimated): April 30, 2026

Study Registration Dates

• First Submitted: April 29, 2024
• First Submitted That Met QC Criteria: April 29, 2024
• First Posted (Actual): May 1, 2024

Study Record Updates

• Last Update Posted (Actual): March 25, 2025
• Last Update Submitted That Met QC Criteria: March 7, 2025
• Last Verified: April 1, 2024

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Antineoplastic Agents, Immunological; Immune Checkpoint Inhibitors; Anti-Infective Agents; Antineoplastic Agents; Immunosuppressive Agents; Immunologic Factors; Physiological Effects of Drugs; Molecular Mechanisms of Pharmacological Action; Antirheumatic Agents; Antiviral Agents; Anti-HIV Agents; Anti-Retroviral Agents; Abatacept; Aldesleukin
• Other Study ID Numbers: PRO00037661

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: YES

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No