NiCord® is a stem/progenitor cell-based product composed of ex vivo expanded allogeneic cells from one entire unit of UCB. NiCord® utilizes the small molecule nicotinamide (NAM), as an epigenetic approach to inhibit differentiation and to increase the migration, bone marrow (BM) homing and engraftment efficiency of Hematopoietic Progenitor Cells (HPC) expanded in ex vivo cultures. The chief aim of the study is to compare the safety and efficacy of NiCord® single ex-vivo expanded cord blood unit transplantation to unmanipulated cord blood unit transplantation in patients with hematological malignancies following conditioning therapy.