Posttransplantation outcome according to WPSS. Overall survival (A), probability of relapse (B), and transplant-related mortality (C) after allogeneic hematopoietic stem cell transplantation in patients diagnosed with MDS according to WHO criteria and classified according to WPSS. Risk categories were evaluated at the time of transplantation in patients undergoing allo-SCT upfront and before remission-induction chemotherapy in those receiving treatment before transplantation.