Abstract
In order to monitor the clinical outcome of pediatric patients with leukemia following allogeneic hematopoietic transplantation, tests of variable number of tandem repeat (VNTR) and sex determination by quantitative polymerase chain reaction (PCR) were performed. PCR results combined with the blast counts from 21 leukemia patients were analyzed. Complete chimerism (100% donor cells) was found in 15 cases with remission, and incomplete chimerism in six cases with relapse. In the majority of cases, complete chimerism was always associated with no detectable blasts, while blasts were often detected in association with incomplete chimerism. There is significant correlation (Pā<ā0.0001) between the percentage of donor DNA and blast percentage in these patients. Early detection of incomplete chimerism may therefore predict a poor prognosis. In one patient (case 15), a differing percentage of donor DNA was observed between samples of bone marrow and peripheral blood collected on the same day. This may be due to the fact that allogeneic stem cells proliferate at different rates depending on their environment (bone marrow or peripheral blood). In addition, 100% donor cells found in the peripheral blood may not reflect the number of cells in the bone marrow. In case 17, asynchronous engraftment of donor cells was present between the white and red blood cell lineages, indicating that the degree of chimerism may not be the same in all cell lineages. At the time of this report, the significance of this observation is unknown and needs further investigation.
Bone Marrow Transplantation (2002) 29, 51ā56. doi:10.1038/sj.bmt.1703333
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Acknowledgements
The authors would like to acknowledge Kelly Coyne, CPNP, Karen Smith, CPNP, and . Marie Olszewski of the Children's Memorial Hospital Stem Cell Transplant team for their contribution to this study.
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Wang, LJ., Chou, P., Gonzalez-Ryan, L. et al. Evaluation of mixed hematopoietic chimerism in pediatric patients with leukemia after allogeneic stem cell transplantation by quantitative PCR analysis of variable number of tandem repeat and testis determination gene. Bone Marrow Transplant 29, 51ā56 (2002). https://doi.org/10.1038/sj.bmt.1703333
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DOI: https://doi.org/10.1038/sj.bmt.1703333
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