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Study on Long-Term Safety and Efficacy of Gene Therapy for Leukocyte Adhesion Deficiency-I Using RP-L201 in Patients with LAD-I

Investigational
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What is this trial about?

A plain-language summary of the goals, design and what participants do

This clinical trial is focused on studying a rare genetic disorder called Leukocyte Adhesion Deficiency-I (LAD-I). This condition affects the immune system, making it difficult for the body to fight off infections. The treatment being tested is called LADICell, which is a type of gene therapy. It involves using the patient's own blood stem cells, which are modified in a laboratory to include a new gene called the ITGB2 gene. This gene helps produce a protein known as CD18, which is important for the immune system to function properly.

The purpose of this study is to evaluate the long-term safety and effectiveness of this gene therapy. Participants in the study will receive an infusion of their own modified stem cells. The study will monitor participants over a long period to see how well the treatment works and to check for any side effects. This involves regular follow-up visits where doctors will assess the participants' health and the functioning of their immune system.

Throughout the study, researchers will look for improvements in the symptoms of LAD-I, such as a reduction in infections and skin or oral lesions. They will also monitor for any serious side effects that might occur after the treatment. The study aims to provide valuable information on whether this gene therapy can be a safe and effective treatment option for people with LAD-I.

The research process

The trial runs in 5 steps – from screening to follow-up. Each step says what happens and what the team monitors.

  1. Step 1

    Joining the study

    Upon joining the study, you will be required to provide written informed consent. This is a document that confirms your willingness to participate and your understanding of the study's requirements.

    You must have been enrolled in the Phase I/II parent study RP-L201-0318 and have received the investigational treatment RP-L201 in that study.

  2. Step 2

    Initial assessment

    An initial assessment will be conducted to evaluate your current health status. This may include physical examinations and laboratory tests to establish a baseline for your health condition.

  3. Step 3

    Treatment administration

    The treatment involves an infusion of LADICell, which consists of your own stem cells that have been genetically modified. This is administered through an intravenous infusion, meaning it is delivered directly into your bloodstream through a vein.

  4. Step 4

    Monitoring and follow-up

    After the infusion, regular follow-up visits will be scheduled to monitor your health and the effects of the treatment. These visits will include assessments to check for any significant infections, new skin or oral lesions, and other health indicators related to your condition.

    The study aims to evaluate the long-term safety and efficacy of the treatment, so these follow-up visits will continue for an extended period, potentially up to the estimated end date of the study in April 2037.

  5. Step 5

    Evaluation of outcomes

    Throughout the study, various outcomes will be evaluated, such as the reduction of significant infections, improvement of LAD-I-related symptoms, and the persistence of the genetic modification in your blood cells.

    The study will also monitor for any late-occurring side effects that may be related to the treatment.

Who can join the trial?

4 criteria

  • The person must have been part of the earlier Phase I/II study called RP-L201-0318.
  • The person must have received the treatment called RP-L201 in the earlier study RP-L201-0318.
  • The person must be willing and able to follow the schedule for study visits and meet other study requirements.
  • The person must be willing and able to give written permission to participate in the study. If needed, they must also agree to participate according to current rules and regulations.

Who cannot join the trial?

1 criterion

  • There are no specific reasons listed that would prevent a patient from participating in this study.
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Investigated drugs

RP-L201 is a type of gene therapy used in this clinical trial. It involves taking a patient's own blood-forming stem cells and modifying them in a laboratory. The modification is done using a special tool called a lentiviral vector, which carries a healthy version of the ITGB2 gene. This gene is important for helping white blood cells function properly. After the modification, the stem cells are infused back into the patient. The goal of this therapy is to help the patient's immune system work better by correcting the genetic problem that causes Leukocyte Adhesion Deficiency-I (LAD-I). This trial is focused on checking how safe and effective this treatment is over a long period of time.

What is already known about the treatment

RP-L201 – RP-L201 is administered through an infusion, which means it is delivered directly into the bloodstream. This medication is currently being studied in clinical trials for its safety and effectiveness in treating Leukocyte Adhesion Deficiency-I (LAD-I), a rare genetic disorder. The main therapeutic goal of RP-L201 is to help the body produce healthy white blood cells, which are crucial for fighting infections. It works by using a modified virus to deliver a correct version of the ITGB2 gene into the patient's own stem cells, allowing them to produce functional white blood cells. RP-L201 is classified as a gene therapy, a type of treatment that aims to correct or replace faulty genes.

Investigated diseases

Leukocyte Adhesion Deficiency-I (LAD-I) – Leukocyte Adhesion Deficiency-I is a rare genetic disorder that affects the immune system. It is characterized by the inability of white blood cells to properly adhere to blood vessel walls, which is crucial for fighting infections. As a result, individuals with LAD-I experience recurrent bacterial infections, particularly affecting the skin and mucous membranes. The disease often leads to persistent skin rashes, oral lesions, and periodontal abnormalities. Over time, the condition can cause chronic inflammation and tissue damage due to the body's inability to effectively combat infections. The progression of LAD-I can also result in elevated levels of white blood cells in the bloodstream, known as leukocytosis and neutrophilia.
Trial detailsLast updated 2 Oct 2026
Age18+ yearsPhasePhase ITrial ID2022-501086-41-00Protocol codeRP-L201-0121-LTFUEstimated enrolment9 patientsSponsorRocket Pharmaceuticals Inc.

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