Journal
SCIENCE TRANSLATIONAL MEDICINE
Volume 3, Issue 97, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/scitranslmed.3002715
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Categories
Funding
- Department of Health
- Wellcome Trust
- Primary Immunodeficiency Association
- Jeffrey Modell Foundation
- Great Ormond Street Hospital Childrens Charity
- National Institute for Health Research Biomedical Research Centre
- European Union [CELL-PID 261387]
- MRC [G0501969] Funding Source: UKRI
- Great Ormond Street Hospital Childrens Charity [V1223, V1242] Funding Source: researchfish
- Medical Research Council [G0501969] Funding Source: researchfish
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X-linked severe combined immunodeficiency (SCID-X1) is caused by mutations in the common cytokine receptor gamma chain. These mutations classically lead to complete absence of functional T and natural killer cell lineages as well as to intrinsically compromised B cell function. Although human leukocyte antigen (HLA)-matched hematopoietic stem cell transplantation (HSCT) is highly successful in SCID-X1 patients, HLA-mismatched procedures can be associated with prolonged immunodeficiency, graft-versus-host disease, and increased overall mortality. Here, 10 children were treated with autologous CD34(+) hematopoietic stem and progenitor cells transduced with a conventional gammaretroviral vector. The patients did not receive myelosuppressive conditioning and were monitored for immunological recovery after cell infusion. All patients were alive after a median follow-up of 80 months (range, 54 to 107 months), and a functional polyclonal T cell repertoire was restored in all patients. Humoral immunity only partially recovered but was sufficient in some patients to allow for withdrawal of immunoglobulin replacement; however, three patients developed antibiotic-responsive acute pulmonary infection after discontinuation of antibiotic prophylaxis and/or immunoglobulin replacement. One patient developed acute T cell acute lymphoblastic leukemia because of up-regulated expression of the proto-oncogene LMO-2 from insertional mutagenesis, but maintained a polyclonal T cell repertoire through chemotherapy and entered remission. Therefore, gene therapy for SCID-X1 without myelosuppressive conditioning effectively restored T cell immunity and was associated with high survival rates for up to 9 years. Further studies using vectors designed to limit mutagenesis and strategies to enhance B cell reconstitution are warranted to define the role of this treatmentmodality alongside conventional HSCT for SCID-X1.
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