NCT05241444 · Bacchetta, Rosa, MD
CD4^LVFOXP3 in Participants With IPEX
What this study is about
This first-in-human, Phase 1 clinical trial will test the feasibility of the manufacturing and the safety of the administration of CD4\^LVFOXP3 in up to 30 evaluable human participants with IPEX and evaluate the impact of the CD4\^LVFOXP3 infusion on the disease.
View original scientific description
This first-in-human, Phase 1 clinical trial will test the feasibility of the manufacturing and the safety of the administration of CD4\^LVFOXP3 in up to 30 evaluable human participants with IPEX and evaluate the impact of the CD4\^LVFOXP3 infusion on the disease.
Interventions
BIOLOGICAL
CD4^LVFOXP3
Infusion of autologous CD4+ T cells that have undergone lentiviral-mediated gene transfer of: i) healthy human FOXP3 gene leading to persistent high FOXP3 expression and acquisition of Treg-like cell function; and ii) human CD271 surface marker gene that allows tracking and quantification of the CD4\^LVFOXP3 in the blood.
Primary outcome measures
Meet target cell number for dose manufacturing
Time frame: Time at release from manufacturing (by Day 0 [infusion day] for each participant)
No more than two products fail the target cell dose and established release criteria.
Find the safe maximum tolerated dose
Time frame: Up to 60 days post-infusion for each participant
No more than 1 out of 6 participants may experience a related dose limiting toxicity or treatment emergent adverse events.
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Body weight greater than 8 kg, unless assessed as able to tolerate leukapheresis
- FOXP3 gene mutation
- Medical history of progressive symptoms of IPEX with persistency of some symptoms and/or signs requiring immune suppressive medication. The participant may or may not be on immunosuppression at time of starting the study.
- Uncontrolled IPEX disease but unable to tolerate immune suppressive medication
- Recurrent IPEX symptoms, requiring immune suppressive medications, in participants who have had prior allogeneic (allo) blood stem cell transplantation (HSCT).
- ≥ 50% Performance rating on Lansky/Karnofsky Scale
- Organ and marrow function within acceptable levels of function
- Absence of ongoing infections
- Must be able to consent if an adult
Exclusion criteria
- Medical instability
- Less than 6 months life expectancy
- Inability to meet limits for steroid dosing
- Eligible for an HLA matched sibling or matched unrelated donor blood stem cell transplant, and be willing to undergo transplant.
- Unrelated or comorbid disease
- Allergy to any study medication, product, or intervention
- Currently receiving another experimental treatment
- History of malignancy, unless disease free for at least 2 years, with the exception of non melanoma skin cancer or carcinoma in situ
Where
- Palo Alto, California
Collaborators
California Institute for Regenerative Medicine (CIRM)
Related conditions & keywords
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced May 22, 2025 · Source of record for eligibility and locations