OS according to donor source. (A) OS in the United States (CIBMTR data). (B) OS in Europe (EBMT data). CIBMTR data show that the 1-year probability of OS for SCD patients for HLA-identical = 91%, CB = 84%, unrelated donor = 71%, and haploidentical = 91%; EBMT data show that the 1-year probability for OS for SCD patients for HLA-identical = 95%, CB = 96%, unrelated donor chest = 92%, and haploidentical = 78%.