Donor-engrafted CH in allo-HSCT. (A) Proportion of donor-recipient pairs affected by donor-engrafted CH. (B) VAFs in individual donor-recipient pairs of cases of donor-engrafted CH. (C) Pooled analyses of VAFs in donor-recipient pairs with of donor-engrafted CH. Wilcoxon matched-pairs signed rank test was used to calculate statistical significance. (D) Donor age at transplantation for cases of donor-engrafted CH. Mann-Whitney test was used to calculate statistical significance. (E) Case example of donor-engrafted CH progressing to myelodysplastic syndromes. D, donor; R, recipient.