Post-HSCT Maintenance Treatment Using Entrectinib for an AML Patient Accompanied with ETV6::NTRK3: A Case Report.

The neurotrophic receptor tyrosine kinase (NTRK) gene fusions occur in a large number of solid tumors and tropomyosin receptor kinase (TRK) inhibitors exhibit attractive antitumor activity. However, the occurrence of NTRK fusions is rare in hematological malignancies, and just a few cases or pre-clinical researches have been reported. This case report presents a refractory acute myeloid leukemia (AML) patient, accompanied with ETV6::NTRK3, was failed by traditional chemotherapy, then entered long-term remission after hematopoietic stem cell transplantation (HSCT) and maintenance therapy with entrectinib. It was the first successful use of the TRK inhibitor in an AML patient after HSCT.