Donor cell leukemia is a rare complication following hematopoietic stem cell transplant (HSCT). There are currently few reports in children and only rare, reported cases of donor-derived myelodysplastic syndrome/acute myeloid leukemia in patients with an underlying germline GATA2 mutation. Most reported cases are myeloid in origin and occur following related HSCT. We present a 3-year-old female who developed a donor-derived B-cell acute lymphoblastic leukemia 2 years post unrelated HSCT for GATA2 germline mutation.
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