Clinical practice recommendation on hematopoietic stem cell transplantation for acute myeloid leukemia patients with FLT3 -internal tandem duplication: a position statement from the Acute Leukemia Working Party of the European Society for Blood and Marrow Transplantation

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Abstract
The FMS-like tyrosine kinase 3 (FLT3) gene is mutated in 25-30% of patients with acute myeloid leukemia . Because of the poor prognosis associated with FMS-like tyrosine kinase 3 internal tandem duplication mutated Acute myeloid leukemia, allogeneic-hematopoietic stem-cell transplantation was commonly performed in first complete remission. Remarkable progress has been made in frontline treatments with the incorporation of FLT3 inhibitors and the development of highly sensitive minimal/measurable residual disease assays. Similarly, recent progress in allogeneic-hematopoietic stem-cell transplantation includes improvement of transplant techniques, the use of haplo-identical donors in patients lacking an HLA matched donor, and the introduction of FLT3 inhibitors as posttransplant maintenance therapy. Nevertheless, current transplant strategies vary between centers and differ in terms of transplant indications based on the internal tandem duplication allelic ratio and concomitant nucleophosmin-1 mutation, as well as in terms of post-transplant maintenance/consolidation. This review generated by international leukemia or transplant experts, mostly from the European Society for Blood and Marrow Transplantation, attempts to develop a position statement on best approaches for allogeneic-hematopoietic stem-cell transplantation for acute myeloid leukemia with FMS-like tyrosine kinase internal tandem duplication including indications and modalities of allogeneic-hematopoietic stem-cell transplantation and on potential optimization of post-transplant maintenance with FMS-like tyrosine kinase inhibitors.

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