Poor transplant outcomes in the pre-HSCT EC < 0.1% group relative to the EC ≥ 0.1% group. Based on the ROC cutoff percentage of BM ECs pre-HSCT (0.1%), the enrolled patients were assigned to the BM EC ≥ 0.1% group (N = 38) and the BM EC < 0.1% group (N = 30) in the first clinical trial. ROC curve (A), cumulative incidences of PGF and PT (B), platelet engraftment (C), neutrophil engraftment (D), NRM (E), aGVHD (F), and relapse (G), and probabilities of DFS (H) and OS (I) were compared between the EC < 0.1% group and the EC ≥ 0.1% group. Cumulative incidence curves were analyzed using a competing risk setting and were compared using the Gray test. The probabilities of DFS and OS were estimated with the Kaplan-Meier method and were compared using the log-rank test.