Journal
BONE MARROW TRANSPLANTATION
Volume 43, Issue 1, Pages 29-36Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/bmt.2008.267
Keywords
hematopoietic SCT; HLA-mismatched; haploidentical; graft composition; CD4/CD8 ratio
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Funding
- Hi-Tech Research and Development Program of China [2006AA02Z4AO]
- China National Funds for Distinguished Young Scientist's [30725038]
- Funds for Creative Research Groups of China [IRT0702]
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This study examines the absolute numbers and relative proportions of CD4+, CD8+, CD14+ and CD34+ cells contained in allografts and their impact on early engraftment and later clinical outcomes in 141 patients with hematological malignancies who underwent unmanipulated HLA-mismatched/haploidentical hematopoietic SCT without in vitro T-cell depletion. These patients received G-CSF-primed BM grafts (G-BM) and peripheral blood grafts (G-PB) following a modified regimen of BU/CY 2 plus antithymocyte globulin. Multivariate analysis showed that high CD34+ cell numbers were associated with accelerated plt engraftment (P = 0.001). Meanwhile, patients with a higher CD4/CD8 ratio in G-BM (>= 1.16) had a survival disadvantage (P < 0.01) and a trend towards relapse (P = 0.086) after controlling for disease status. A higher CD4/CD8 was also associated with a significantly increased risk of acute GVHD grades II-IV (P = 0.013), even after adjusting for an ABO major mismatch. No aspect of graft composition affected neutrophil engraftment or chronic GVHD. In conclusion, the differences in CD34+ cell dose and the CD4/CD8 ratio in grafts seem to affect engraftment and clinical outcomes; in particular, a lower CD4/CD8 ratio in primed BM graft is associated with a survival benefit.
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