title: [Analysis of ITD characteristics in acute myeloid leukemia patients with FLT3-ITD positive].
abstract: The aim of this study was to analyze the FMS-like tyrosine kinase 3 internal tandem duplication (FLT3-ITD) allelic ratios (AR), number of ITD, ITD length and positions of ITD insertions in de novo acute myeloid leukemia (AML) patients with FLT3-ITD positive, and the relationship between mutant level and therapeutic efficacy. Genomic DNA was amplified by PCR, capillary electrophoresis was used to detect the ITD characteristics in 31 de novo AML patients, and DNA sequences analysis of FLT3-ITD(+) were performed in 13 patients. The results showed that the ratios of mutant to wild type FLT3 allele ranged from 0.01 to 2.8; 28 patients (90.32%) had a single ITD, the remaining 3 patients had more than one ITD; the ITD length ranged from 3 to 144 bp in all FLT3-ITD(+) patients. 13 sequence-analyzed patients, 4 patients were of pure duplications, and 2 patients had foreign bases inserted, and the other 7 patients were partial duplications. The ITD occurred in the regions from p.E573 to p.P606 of the FLT3 protein, with the majority clustered in a stretch between p.F590 and p.R595. The complete remission (CR) rate in AR < 0.5 patients (43.75%) were more prevalent as compared with AR ≥ 0.5 patients (16.67%) (p > 0.05). It is concluded that the ITD length and AR are vary widely. Some of the insertions are foreign bases, and all of the 13 sequences-analyzed ITD were concentrated on the juxtamembrane domain. The CR rate in patients of AR < 0.5 had no statistical significance compared with patients of AR ≥ 0.5.
authors: Department of Clinical Laboratorial Examination, China-Japan Friendship Hospital, Beijing, China.
authors: Liang
authors: L
authors: Ma
authors: Dai-Rong
authors: DR
authors: Feng
authors: Ming-Hua
authors: MH
authors: Zhong
authors: Li-Wei
authors: LW
authors: Wang
authors: Ying
authors: Y
authors: Cai
authors: Yi-Gai
authors: YG
authors: Ma
authors: Shang-Zhi
authors: SZ
authors: Huang
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000483:Alleles; D001483:Base Sequence; D004273:DNA, Neoplasm / Q000235:genetics; D005260:Female; D006801:Humans; D015470:Leukemia, Myeloid, Acute / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D009154:Mutation; D017422:Sequence Analysis, DNA; D020080:Tandem Repeat Sequences; D055815:Young Adult; D051941:fms-Like Tyrosine Kinase 3 / Q000235:genetics*
chemical_list: D004273:DNA, Neoplasm; C497970:FLT3 protein, human; D051941:fms-Like Tyrosine Kinase 3