The fms-related tyrosine kinase 3 internal tandem duplication (FLT3-ITD) can be found in about one quarter of patients with acute myeloid leukemia (AML) [Small D. FLT3 mutations: biology and treatment. Hematology Am Soc Hematology. Educ. Program 2006;178-84 [Review]]. Patients who carry this mutation have a high risk of relapse even after allogeneic stem cell transplantation [Sheikhha MH, Awan A, Tobal K, Liu Yin JA. Prognostic significance of FLT3 ITD and D835 mutations in AML patients. Hematol J 2003;4:41-6; Meshinchi S, Arceci RJ, Sanders JE, Smith FO, Woods WB, Radich JP, et al. Role of allogeneic stem cell transplantation in FLT3/ITD-positive AML. Blood 2006;108(1):400-1]. Recent reports show that Sorafenib, a multikinase inhibitor has significant activity against FLT3-ITD(+) blasts in vitro [Auclair D, Miller D, Yatsula V, Pickett W, Carter C, Chang Y, et al. Antitumor activity of sorafenib in FLT3-driven leukemic cells. Leukemia 2007;21(3):439-45]. We here report the first clinical case of molecular remission induced by Sorafenib in a patient with FLT3-ITD(+) AML and extramedullary disease after allogenic stem cell transplantation.
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