Fig. 1: Flow chart of patient selection.

Main cohort: adult recipients between 18 and 70 years of age who received the first transplant with single or double umbilical cord blood (UCB), or haploidentical bone marrow (haplo-BM) or haploidentical peripheral blood stem cells (haplo-PBSC), for leukemia, lymphoma, myelodysplastic syndrome, and myeloproliferative neoplasm. Extended cohort: criteria for Main Cohort plus HLA-identical sibling and HLA-matched other relatives (MRD), HLA-matched unrelated donor (MUD), or HLA-mismatched unrelated donor (mMUD). Both cohorts exclude transplants for solid tumors and non-malignant disorders, as well as multiple grafts, such as UCB and BM, or PBSC and BM, or PBSC and UCB.