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Blood, 15 March 2005, Vol. 105, No. 6, pp. 2300-2306. Prepublished online as a Blood First Edition Paper on November 30, 2004; DOI 10.1182/blood-2004-04-1473.
CLINICAL OBSERVATIONS, INTERVENTIONS, AND THERAPEUTIC TRIALS Engraftment and survival following reduced-intensity allogeneic peripheral blood hematopoietic cell transplantation is affected by CD8+ T-cell doseFrom the Division of Blood and Marrow Transplantation, Department of Medicine, Stanford University School of Medicine; the Department of Pathology, Stanford University School of Medicine; the Department of Health Research and Policy, Stanford University; Stanford Cellular Therapeutics and Transplantation Laboratory, Stanford Hospital and Clinics, Stanford, CA; and the Histocompatibility Laboratory, Stanford Medical School Blood Center, Palo Alto, CA.
The influence of graft composition on clinical outcomes after reduced-intensity conditioning is not well-characterized. In this report we prospectively enumerated CD34+, CD3+, CD4+, and CD8+ cell doses in granulocyte colony-stimulating factormobilized peripheral blood mononuclear cell (G-PBMC) allografts in 63 patients who received transplants following non-myeloablative conditioning with total body irradiation 200 cGy plus fludarabine as treatment for malignant diseases. Donors were HLA-identical siblings (n = 38) or HLA-matched unrelated individuals (n = 25). By univariate analyses G-PBMC CD8+ T-cell dose in at least the 50th percentile favorably correlated with full donor blood T-cell chimerism (P = .03), freedom from progression (P = .001), and overall survival (P = .01). No G-PBMC cell dose influenced grade II to IV acute or extensive chronic graftversus-host disease. In multivariate analysis only G-PBMC CD8+ T-cell dose (P = .003; RR = 0.2, 95% CI = 0.1-0.6) was associated with improved freedom from progression. Infusion of low G-PBMC CD8+ T-cell dose for reduced-intensity allografting may adversely affect T-cell engraftment and survival outcome.
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