This is a study to evaluate the safety and efficacy of Miltenyi CliniMACS® CD34 Reagent System to promote engraftment of haploidentical CD34+ selected cells combined with single unit umbilical cord blood transplant for treatment of high-risk hematologic disorders.

In this clinical protocol, the CliniMACS® CD34 Reagent System will be used for processing hematopoietic progenitor cells collected by apheresis (HPC, Apheresis) from an allogeneic, HLA-haploidentical, related donor to obtain a CD34+ cell-enriched population for hematopoietic reconstitution. The haploidentical donor will be mobilized by G-CSF and undergo one apheresis to collect CD34+ stem cells. The products will be cryopreserved until the time of transplantation. Recipients with hematologic disorders who require transplant will receive a standard conditioning regimen and will receive an allograft on day 0 containing donor CD34+ cells that have been positively selected and T-cell depleted following G-CSF mobilization combined with a single UCB unit.

Inclusion Criteria - Recipient

• Ages 18-80 years inclusive
• Diagnosed with high risk hematologic disorders warranting stem cell transplant per institutional standard of care
• Lack HLA-identical related donor
• Availability of at least one HLA- haploidentical (i.e. => 5/10 and <= 8/10 HLA match) related donor (HLA-A, B, C, DR, and DQ loci) who is available to donate CD34+ cells.
• Availability of at least one 4/6 HLA-matched (HLA-A, B, and DR loci) cord blood unit from the National Marrow Donor Program (NMDP). The cord blood unit must contain a minimum TNC (prior to thawing) of at least 2x107 cells per kilogram of recipient body weight
• Ability to comprehend the nature of the treatment 6.2. Exclusion Criteria - Recipient (any of the following)
• HLA identical (6/6) related donor available and readily accessible at time of transplantation evaluation
• Any patient not meeting institutional standard guidelines for transplant eligibility