Yazarlar : Man CH, Fung TK, Ho C, et al

Yayın : Blood

Yayın Yılı : 2012

Pubmed Linki : http://www.ncbi.nlm.nih.gov/pubmed/22368270

Konu : Lösemi

Literatür İçeriği :  

Abstract

Internal tandem duplication (ITD) of the fms-related tyrosine kinase-3 (FLT3) gene occurs in 30% acute myeloid leukemias (AML) and confers a poor prognosis. Thirteen relapsed or chemo-refractory FLT3-ITD+ AML patients were treated with sorafenib (200-400 mg twice daily). Twelve patients showed clearance or near clearance of bone marrow (BM) myeloblasts after 27 (range 21-84) days with evidence of differentiation of leukemia cells. The sorafenib response was lost in most patients after 72 (range 54-287) days but the FLT3 and downstream effectors remained suppressed. Gene expression profiling showed that leukemia cells which have become sorafenib resistant expressed a number of genes including ALDH1A1, JAK3 and MMP15, whose functions were unknown in AML. NOD/SCID mice transplanted with leukemia cells from patients before and during sorafenib resistance recapitulated the clinical results. Both ITD and tyrosine kinase domain (TKD) mutations at D835 were identified in leukemia initiating cells (LIC) from samples before sorafenib treatment. LIC bearing the D835 mutant have expanded during sorafenib treatment and dominated during the subsequent clinical resistance. These results suggested that sorafenib have selected more aggressive sorafenib-resistant subclones carrying both FLT3-ITD and D835 mutations and might provide important leads to further improvement of treatment outcome with FLT3 inhibitors.

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