There are many occasions wherein stem cell transplantations are required for complete remission in patients diagnosed with blood disorders. When there is no domestic donor with a full match for a patient with a blood disorder, transplantation has been traditionally performed from an overseas donor. Recently, haploidentical stem cell transplantations have been actively performed. As the current trend shows that number of haploidentical stem cell transplantations is continuously increasing, it becomes necessary to create evidence of how actively transplantations need to be performed from overseas donors.