RT Journal Article T1 Haploidentical Transplantation with Post-Transplantation Cyclophosphamide for T Cell Acute Lymphoblastic Leukemia: A Report from the European Society for Blood and Marrow Transplantation Acute Leukemia Working Party. A1 Bazarbachi, Ali A1 Labopin, Myriam A1 Angelucci, Emanuele A1 Gülbas, Zafer A1 Ozdogu, Hakan A1 Arat, Mutlu A1 de Rosa, Luca A1 Pastano, Rocco A1 Pioltelli, Pietro A1 Montserrat, Rovira A1 Martino, Massimo A1 Ciceri, Fabio A1 Koç, Yener A1 Socié, Gerard A1 Blaise, Didier A1 Herrera, Concepcion A1 Chalandon, Yves A1 Bernasconi, Paolo A1 Marotta, Giuseppe A1 Castagna, Luca A1 McDonald, Andrew A1 Visani, Guiseppe A1 Carluccio, Paola A1 Vitek, Antonin A1 Simand, Célestine A1 Afanasyev, Boris A1 Rösler, Wolf A1 Diez-Martin, J L A1 Nagler, Arnon A1 Brissot, Eolia A1 Giebel, Sebastian A1 Mohty, Mohamad K1 Conditioning K1 Haploidentical stem cell transplantation K1 T-ALL K1 Thiotepa K1 Total body irradiation AB Allogeneic hematopoietic cell transplantation (HCT) is recommended in high-risk patients with T cell acute lymphoblastic leukemia (T-ALL). For patients without an HLA-identical donor, haploidentical (haplo-) HCT is becoming the leading source of stem cell donation. However, data are scarce on predictive factors for outcome in that setting. We identified 122 adults (20% female; median age, 31 years; range, 18 to 68 years) with T-ALL who underwent haplo-HCT with post-transplantation cyclophosphamide (ptCy) between 2010 and 2017. The median duration of follow-up of living patients was 23 months. The 2-year incidences of relapse and nonrelapse mortality were 45% and 21%, respectively. The 2-year leukemia-free survival (LFS), overall survival (OS), and graft-versus-host disease, relapse-free survival (GRFS) were 34%, 42%, and 27%, respectively. The 2-year LFS and OS were highly influenced by disease status at transplantation, being 49% and 55%, respectively, for patients in first complete remission (CR1); 34% and 50%, respectively, for those in second CR (CR2); and 8% and 12%, respectively, for patients with active disease. On multivariate analysis, only disease status was found to affect LFS and OS. Transplantation in CR2 negatively affected LFS, whereas active disease at the time of haplo-HCT negatively affected LFS and OS. In conclusion, haplo-HCT with ptCy produced encouraging results in this challenging disease, particularly when performed in patients in CR. Despite the limitation of the small sample size, our results were not affected by the type of conditioning, calling into question the need for total body irradiation-based myeloablative conditioning in that setting. YR 2020 FD 2020-01-09 LK http://hdl.handle.net/10668/14942 UL http://hdl.handle.net/10668/14942 LA en DS RISalud RD Apr 6, 2025