 In these settings it is easier and faster to identify a partially HLA-matched or haploidentical family member as a stem cell donor. The use of haploidentical donors broadens the application of HSCT because it is not as limited by family size or racialethnic HLA diversity. Because parents and children, as well as siblings can be used as haploidentical donors, this type of transplant enfranchises almost every segment of the population. 