Linked Life Data

18955982

Source:http://linkedlifedata.com/resource/pubmed/id/18955982

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pubmed-article:18955982pubmed:abstractTextAn increasing percentage of autologous cells (increasing chimerism) in the whole blood (WB) chimerism test following allogeneic transplant is related to a very high risk of relapse. Preemptive immunotherapy may decrease the risk of relapse in some patients. Our prospective multi-institutional study evaluated the feasibility of longitudinal chimerism testing in a central laboratory, compared WB, CD3+ and leukemia-specific lineage chimerism in patients with a variety of hematologic malignancies, and evaluated the feasibility of fast withdrawal of immunosuppression based on WB chimerism results. Centralized chimerism testing was feasible and showed low interassay variability. Increasing mixed chimerism (MC) in WB was not useful as a predictor of relapse in our study. The presence of full donor chimerism in WB, CD3+ and leukemia-specific lineages on all measurements was related to a significantly lower risk of relapse than the presence of MC in either subset (11 vs 71%, respectively; P=0.03). Increasing host chimerism in leukemia-specific lineage heralds relapse, but it was not detected early enough to allow immunotherapy. Further studies correlating lineage-specific chimerism and minimal residual disease are required. The goal of preemptive immunotherapy should be to achieve full donor chimerism in WB in CD3+ and leukemia-specific lineages.lld:pubmed
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pubmed-article:18955982pubmed:year2009lld:pubmed
pubmed-article:18955982pubmed:articleTitleFeasibility study of preemptive withdrawal of immunosuppression based on chimerism testing in children undergoing myeloablative allogeneic transplantation for hematologic malignancies.lld:pubmed
pubmed-article:18955982pubmed:affiliationDepartment of Pediatrics, UCSF Medical Center, University of California, San Francisco, CA 94143-1278, USA. hornb@peds.ucsf.edulld:pubmed
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