This Long-Term Follow-Up (LTFU) for Gene Therapy of Leukocyte Adhesion Deficiency-I (LAD-I) is a continuation of a Phase 1/2 clinical study to evaluate the safety and efficacy of the infusion of autologous hematopoietic stem cells transduced with a lentiviral vector encoding the ITGB2 gene
Following the end of participation in Study RP-L201-0318, patients will be offered enrollment into this LTFU protocol. Patients will be followed for up to 15 years following the RP-L201 infusion in the parent study, until the patient dies, withdraws consent, or is lost to follow-up (whichever occurs first). For all follow-up visits, remote evaluation facilitated by local health care providers (with blood sample shipment to relevant laboratory facilities) is permitted; however, annual visits to the study center are required during initial 3 years post- RP-L201 infusion. Visits where a bone marrow sample is being collected are required to be performed at the study center for the duration of the study. Peripheral Blood samples and bone marrow samples will be archived and tested when clinically or scientifically indicated, as in the event of development of a second malignancy.
Study Type
OBSERVATIONAL
Enrollment
9
University of California, Los Angeles (UCLA)
Los Angeles, California, United States
Hospital Infantil Universitario Niño Jesús
Madrid, Spain
University College London Great Ormond Street Institute of Child Health (GOSH)
London, United Kingdom
Hematopoietic stem cell transplant (HSCT) free survival
Survival without allogeneic-HSCT.
Time frame: 15 years
Incidence of hospitalizations
Incidence of infection-related hospitalizations.
Time frame: 15 years
Incidence of significant infections
Incidence of infections requiring hospitalization or intravenous antimicrobials.
Time frame: 15 years
Resolution of LAD-I-related skin rash
Partial or complete resolution of LAD-I skin rash evident by photographical images.
Time frame: 15 years
Resolution of LAD-I-related periodontal abnormalities
Partial or complete resolution of LAD-I periodontal abnormalities evident by photographical images.
Time frame: 15 years
Event free survival
Survival in the absence of graft failure and graft versus host disease.
Time frame: 15 years
Overall Survival
Survival in the absence of death from any cause
Time frame: 15 years
Long-term genetic correction in peripheral blood mononuclear cells (PBMCs)
Persistence of transgene in PB cells as demonstrated by vector copy number (VCN) of at least 0.1 in PBMCs.
Time frame: 15 years
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Long-term genetic correction in PB CD15+ granulocytes
Persistence of transgene in PB cells as demonstrated by VCN of at least 0.1 in PB CD15+ granulocytes.
Time frame: 15 years
Long-term CD18 neutrophil expression by flow cytometry
Persistence of CD18 neutrophil expression defined by PB neutrophil CD18 expression to at least 10% of normal.
Time frame: 15 Years
Long-term CD11 neutrophil expression by flow cytometry
Persistence of CD11 a/b neutrophil co-expression
Time frame: 15 Years
Improvement or resolution of LAD-I related neutrophilia
Improvement of LAD-I related neutrophilia based off neutrophils within age-appropriate normal ranges.
Time frame: 15 Years
Improvement or resolution of LAD-I-related leukocytosis.
Improvement of LAD-I related leukocytosis based off leukocytes within age-appropriate normal ranges.
Time frame: 15 Years
Incidence of Investigational Product (IP) related serious adverse events (SAEs)
Incidence of SAEs related to the IP measured by CTCAE (Common Terminology Criteria for Adverse Events) for V5.0 grading scale.
Time frame: 15 Years
Incidence of hematologic malignancy
Incidence of hematologic malignancy related to prior gene therapy or gene-therapy associated medications.
Time frame: 15 Years