CD34+ Selected Stem Cell for Poor Graft Function or Graft Failure

The proposed trial is a single arm, non-randomized, single center pilot study utilizing CliniMACS CD34 Reagent System for patients following allogeneic hematopoietic stem cell transplant (HSCT) requiring treatment of graft dysfunction or failure.

Inclusion Criteria: * Recipient of allogeneic transplantation, adult ≥18 years, from any type of donor including matched related, matched unrelated, mismatched related or mismatched unrelated or haploidentical donor transplant. * Documented evidence of graft dysfunction or failure (a-c): 1. Primary graft Failure: Graft failure is defined as failure to achieve neutrophil engraftment by day +28 or lack of donor chimerism \> 50% by day 45 not due to the underlying malignancy; 2. Poor graft function is defined by at least 2 of the following 3 criteria: Hemoglobin \< 8 g/dL, ANC \< 0.5x109/L, and platelets \< 20x109/L. The cytopenia must be unexplained (such as by disease relapse) and unresponsive to hematopoietic growth factors and must last at least 4 weeks; 3. Secondary graft failure is defined as poor graft function associated with donor chimerism \< 5% after initial engraftment * Transplanted donor availability * Negative pregnancy test within seven (7) days of product infusion for women of childbearing potential. Exclusion Criteria: * Graft failure due to disease relapse or evidence of disease relapse or progression * Donor unavailable or unable to collect peripheral HPC by apheresis * Responsive to conventional measures (such as, hematopoietic growth factor) * Allergic reaction to murine proteins or iron dextran * Women of childbearing potential with positive serum HCG