Univariate Cox analysis showed that younger patients with DSA negativity, with acute leukemia, who had an incomplete response at the time of transplant, and who received a higher dose of CD34+ from a sibling donor after a myeloablative conditioning regimen have a reduced risk of neutrophil and platelet engraftment failure at day +30 post alloSCT. Here, CD34 is linked to acute leukemia.