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Analysis of event-free survival. (a–c) Kaplan–Meier analysis of event-free survival (EFS) with regard to (a) HEDclass I, (b) HEDDR, and (c) HEDtotal. (d) Univariable Cox regression analysis of the impact of low HED on EFS. Abbreviations: CI indicated confidence interval; EFS, event-free survival; HED, HLA evolutionary divergence; and HSCT, hematopoietic stem cell transplantation.
