Outcomes by year, sibling versus unrelated: 1-year survival after myeloablative conditioning for acute leukemias in any remission phase, CML or MDS, age < 50 years, by year of transplant and graft source, 1988-2008. One-year survival rates after transplantation have generally improved over the past 2 decades. Outcomes of unrelated donor transplants are approaching the rates of related donor transplants. Overall survival rates at 1 year are 74% (related donor) and 65% (unrelated donor) for these transplants in 2008. Improvements in HLA-matching techniques with consequently better donor selection, better overall patient selection for transplantation, and improvements in supportive care are the likely explanations for this trend. CIBMTR data used with permission.