Abstract |
To determine whether T cell engraftment and recovery of B cell immunity could be improved, we prospectively treated 15 children with severe combined immunodeficiency disease (SCID) with megadoses of haplocompatible CD34(+) cells and a fixed number of CD3(+) cells without previous myeloablative chemotherapy. Evidence of T cell engraftment was seen in 73% of patients (95% confidence interval [CI] = 48%-90%). Engraftment was more likely in patients with X-linked SCID and in those with evidence of maternal engraftment at the time of diagnosis. In patients with T cell engraftment, the median time to development of a CD4 count > 200 cells/mm(3) and a phytohemagglutinin response > 50% of control was 1.2 and 4.9 months, respectively. Clearance of preexisting infections occurred after a median of 2.8 months. B cell function developed in 33% of engrafted patients (95% CI = 14%-61%). The 1-year event-free survival (EFS) rate was 60% (95% CI = 36%-80%), and the overall survival (OS) rate was 87% (95% CI = 61%-98%), with a median follow-up of 39 months. The use of megadoses of CD34(+) cells with a fixed number of CD3(+) cells in nonmyeloablative hematopoietic stem cell transplantation (HSCT) in patients with SCID is associated with excellent engraftment, T cell recovery, and OS; however, B cell function does not recover in most patients.
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Authors | Christopher C Dvorak, Giun-Yi Hung, Biljana Horn, Elizabeth Dunn, Ching-Ying Oon, Morton J Cowan |
Journal | Biology of blood and marrow transplantation : journal of the American Society for Blood and Marrow Transplantation
(Biol Blood Marrow Transplant)
Vol. 14
Issue 10
Pg. 1125-1133
(Oct 2008)
ISSN: 1523-6536 [Electronic] United States |
PMID | 18804042
(Publication Type: Clinical Trial, Journal Article)
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Chemical References |
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Topics |
- Antigens, CD34
- B-Lymphocytes
(physiology)
- Child
- Female
- Haplotypes
- Hematopoietic Stem Cell Transplantation
(methods, mortality)
- Humans
- Immune System
(physiology)
- Kinetics
- Lymphocyte Count
- Male
- Regeneration
- Remission Induction
- Severe Combined Immunodeficiency
(mortality, therapy)
- Survival Rate
- T-Lymphocytes
(physiology)
- Transplantation Conditioning
(methods)
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