Muhammad Umair Mushtaq, MD, University of Kansas Medical Center, Westwood, KS, compares the different cell sources for allogeneic hematopoietic stem cell transplantation (alloHSCT), and discusses the optimal CD34+ graft cell dose. Dr Ushtaq explains that it is possible to control the amount of CD34+ cells collected from the peripheral blood but not from the bone marrow. In a recent meta-analysis, it was shown that the ideal CD34+ graft cell dose is between 4-6×10⁶/kg, but it is necessary to perform a registry study to better define this value. This interview took place at the Transplantation & Cellular Therapy (TCT) Meetings of ASTCT™ and CIBMTR® 2022 in Salt Lake City, Utah.