Probability of relapse-free survival by disease stage at the time of transplantation in patients with secondary MDS/tAML. Censored indicates censored observations at the date of last contact; RA/RARS, refractory anemia/refractory anemia with ringed sideroblasts; RAEB, refractory anemia with excess blasts; tAML, transformation to AML; and tAML Rx, patients with tAML who received chemotherapy before HCT and were categorized as RA or RAEB at the time of HCT.