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

Inclusion criteria

• ✓. 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;
• ✓. 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;
• ✓. Secondary graft failure is defined as poor graft function associated with donor chimerism \< 5% after initial engraftment