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Danylesko, Ivetta; Peczynski, Christophe; Labopin, Myriam; Polge, Emmanuelle; Tischer, Johanna; Blaise, Didier; Koc, Yener; Gulbas, Zafer; Ciceri, Fabio; Arat, Mutlu; Castagna, Luca; Bruno, Benedetto; Raiola, Anna Maria; Botella-Garcia, Carmen; Savani, Bipin N.; Piemontese, Simona; Ruggeri, Annalisa; Nagler, Arnon and Mohty, Mohamad (2022): Impact of donor kinship on non-T-cell depleted haploidentical stem cell transplantation with post transplantation cyclophosphamide for acute leukemia: From the ALWP of the EBMT. In: Bone Marrow Transplantation, Vol. 57, No. 8: pp. 1260-1268

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Non-T-cell depleted haploidentical hematopoietic cell transplantation (Haplo-HCT) is a unique transplantation setting in which several donors are available. We assessed the impact of donor kinship on outcome of Haplo-HCT with post-transplantation cyclophosphamide in a cohort of 717 acute leukemia patients. We compared sibling with parent donors in patients <= 45 years, and child with sibling donors in patients >45 years. Donor kinship was not associated with worse outcomes in multivariate analysis. For patients <= 45 years, the hazard ratio (HR) for leukemia-free survival (LFS), overall survival (OS), relapse incidence (RI), and chronic graft-versus-host disease (cGVHD) was 0.87 (p = 0.75), 1.19 (p = 0.7), 0.52 (p = 0.19), and 0.99 (p = 0.97) for parents versus siblings, respectively, and for patients >45 years the HR was 0.93 (p = 0.8), 0.98 (p = 0.94), 1.3 (p = 0.53), and 0.98 (p = 0.95) for children versus siblings, respectively. Univariate incidence of acute GVHD grade II-IV was significantly higher in patients transplanted from siblings versus children (p = 0.002). Factors associated with inferior outcome were advanced disease and earlier transplant. In patients <= 45 years, acute lymphocytic leukemia and peripheral blood stem cell graft were additional prognostic factors for OS. We did not find a significant impact of donor kinship on transplantation outcome when analyzing by age group (<= 45 and >45 years).

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