Adjusted probability of transplant-related mortality in adult MDS patients by donor source. In multivariate analysis, the risk of transplant-related mortality was lower in MRD HCT recipients compared with both MUD groups (RR 1.44 (95% CI 1.06-1.95) and 1.80 (95% CI 1.23-2.63) for 8/8 MUD and 7/8 MUD HCT recipients, respectively).