“… 24 Previous authors have suggested that BM, more than PBSC, affects red blood cell engraftment in major ABO-I transplants. 26 In our patients, BM graft predicted the delay of erythroid recovery at multivariate analysis. In addition, when analyzed by graft type, the major ABO-I group had longer RBC transfusion dependence in BM but not PBSC transplant.…”