tailieunhanh - báo cáo khoa học: "The frequency of NPM1 mutations in childhood acute myeloid leukemia"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài:The frequency of NPM1 mutations in childhood acute myeloid leukemia | Braoudaki et al. Journal of Hematology Oncology 2010 3 41 http content 3 1 41 JOURNAL OF HEMATOLOGY ONCOLOGY RESEARCH Open Access The frequency of NPM1 mutations in childhood acute myeloid leukemia 1 2 2 2 2 Maria Braoudaki Chrissa Papathanassiou Katerina Katsibardi Natalia Tourkadoni Kalliopi Karamolegou Fotini Tzortzatou-Stathopoulou1 2 Abstract Background Mutations in the nucleophosmin NPM1 gene have been solely associated with childhood acute myeloid leukemia AML . We evaluated the frequency of NPM1 mutations in childhood AML their relation to clinical and cytogenetic features and the presence of common FLT3 and RAS mutations. Results NPM1 mutations were found in 8 of cases. They involved the typical type A mutation and one novel mutation characterized by two individual base pair substitutions which resulted in 2 amino acid changes W290 and S293 in the NPM protein. FLT3 ITD mutations were observed in 12 of the cases and in one NPMl-mutated case bearing also t 8 21 q22 q22 . No common RAS mutations were identified. Conclusions A relatively consistent NPM1 mutation rate was observed but with variations in types of mutations. The role of different types of NPM1 mutations either individually or in the presence of other common gene mutations may be essential for childhood AML prognosis. Background Acute myeloid leukemia AML is a genetically and phe-notypically heterogenous disease that accounts for 15-20 of childhood leukemia 1 . Several genetic mutations gene rearrangements and chromosomal translocations are involved in the pathogenesis of leukemia. Chromosomal abnormalities like the t 15 17 or the inv 16 have been associated with a particular morphology and clinical behavior 2 . However in patients with no detectable chromosomal abnormalities the genetic background remains unknown 3 4 . Conversely previous work has indicated the involvement of various gene mutations with prognostic relevance in AML including activating mutations of genes encoding

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