Transplant-Related Mortality in Patients Undergoing a Peripheral Blood Stem Cell Transplantation or an Umbilical Cord Blood Transplantation

Inclusion Criteria: * Any of the following hematologic malignancies: * Acute myeloid leukemia (AML) in remission at the time of the transplantation * Acute lymphoblastic leukemia (ALL) in remission at the time of the transplantation * Myelodysplastic syndrome (MDS) * Patient received any of the following transplantations: * Allogeneic T-cell depleted HSCT without ATIR administration from a haploidentical donor between 1 January 2006 and 30 June 2013 (HAPLO group) * Allogeneic HSCT from a fully matched or 1-locus mismatched unrelated donor between 1 January 2010 and 31 December 2012 (MUD/MMUD groups) * Double umbilical cord blood transplantation between 1 January 2010 and 31 December 2012 with no more than 2 human leukocyte antigen (HLA)-mismatches at HLA-A, B, and/or -DR between each of the units and the recipient (UCB group) * Male or female, age ≥ 18, ≤ 65 years. Exclusion Criteria: * Allogeneic stem cell transplantation prior to the transplantation qualifying for the study.