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Clinical Trial Summary

This is a clinical gene transfer study that aims to verify the safety and efficacy of the use of the EFS-ADA lentiviral vector to introduce the human adenosine deaminase (ADA) gene into the hematopoietic progenitors of patients affected with severe combined immunodeficiency due to ADA deficiency. The EFS-ADA vector expresses the human ADA cDNA under the control of the elongation factor alpha short promoter (EFS). In addition, this protocol will examine the effects of the ADA gene transfer on the immune system of treated patients. Patients with ADA deficiency and ineligible for matched sibling allogeneic bone marrow transplantation are eligible to participate in the study. To increase engraftment and selected advantage or gene-corrected cells, busulfan will be used as a cytoreductive agent. Enzyme replacement (PEG-ADA) will be discontinued 30 days after infusion of gene-corrected cells. CD34+ hematopoietic progenitors will be isolated from the patient bone marrow, peripheral blood or cord blood, exposed to lentiviral vector-mediated gene transfer and re-infused into the patient through a peripheral vein. Clinical, immunological and molecular follow-up studies will assess safety, toxicity, and efficacy of the procedure.


Clinical Trial Description

This is a clinical gene transfer study that aims to verify the safety and efficacy of the use of the EFS-ADA lentiviral vector to introduce the human adenosine deaminase (ADA) gene into the hematopoietic progenitors of patients affected with severe combined immunodeficiency due to ADA deficiency. The EFS-ADA vector expresses the human ADA cDNA under the control of the elongation factor alpha short promoter (EFS). In addition, this protocol will examine the effects of the ADA gene transfer on the immune system of treated patients. Patients with ADA deficiency and ineligible for matched sibling allogeneic bone marrow transplantation are eligible to participate in the study. To increase engraftment and selected advantage or gene-corrected cells, busulfan will be used as a cytoreductive agent. Enzyme replacement (PEG-ADA) will be discontinued 30 days after infusion of gene-corrected cells. CD34+ hematopoietic progenitors will be isolated from the patient bone marrow, peripheral blood or cord blood, exposed to lentiviral vector-mediated gene transfer and re-infused into the patient through a peripheral vein. Clinical, immunological and molecular follow-up studies will assess safety, toxicity, and efficacy of the procedure. ;


Study Design


Related Conditions & MeSH terms


NCT number NCT02022696
Study type Interventional
Source National Institutes of Health Clinical Center (CC)
Contact
Status Completed
Phase Phase 1
Start date December 16, 2013
Completion date September 21, 2017

See also
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Completed NCT03878069 - Registry Study of Revcovi Treatment in Patients With ADA-SCID
Active, not recruiting NCT05300347 - Observational Study Evaluating the Prevalence of Enzyme Deficiency in Pulmonology Clinics (ADA)
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Enrolling by invitation NCT05300373 - Evaluation of Adenosine Deaminase (ADA) Enzyme Deficiency in Patients With Lymphopenia and/or Elevated Immunoglobulin E
Completed NCT00008450 - Total-Body Irradiation Followed By Cyclosporine and Mycophenolate Mofetil in Treating Patients With Severe Combined Immunodeficiency Undergoing Donor Bone Marrow Transplant Phase 1