胃肠道间质瘤c-kit和PDGFRA基因突变检测及临床诊断意义

Status and clinical impficafion of c-kit and PDGFRA mutations in gastrointestinal stromal tumor

目的 观察c-kit基因和PDGFRA基因在胃肠道间质瘤（GIST）中的突变.方法 分析23例GIST患者的临床病理资料,检测23例GIST c-kit基因9、11、13和17号外显子突变以及PDGFRA基因12和18号外显子突变.结果 23例GIST中kit基因突变率为70.0%,其中11、9、13号外显子突变分别为56.5%、8.7%、4.3%,未检测到17号外显子的突变.PDGFRA基因突变率为13.0%,其中18、12号外显子突变分别为8.7%、4.3%.结论 GIST病例大多数存在c-kit基因和PDGFRA基因的突变,CD117阳性GIST主要表现为c-kit突变,以11号外显子突变最为常见,PDGFRA基因突变主要见于CD117阴性GIST.

Objective To explore the starus of activating mutations of c-kit and PDGFRA in gastrointestinal stromal tumor （GIST） of Chinese patients.Methods The clinic and pathological data of a series of patients with gastrointestinal stromal tumors in 2008-2009 yrs were analyzed retrospectively.Exon 9,11,13,17 of c-kit and exon 12,18 of PDGFRA were analyzed by direct sequencing.Results c-kit mutations were detected in 70.0% of patients as follows ：56.5% in exon 11 ,8.7% in exon 9,4.3% in exon 13 and none in exon 17.PDGFRA mutations were present in 13.0% of CD1 17-negative GIST,8.7% in exon 18,4.3% in exon 12.Conclusion The vast majority of GIST in this study harbored c-kit and PDGFRA mutation.Most CD117 expressing GIST show c-kit mutations that are preferentially in exon 11.PDGFRA genic mutations are more likely seen in kit-negative GISTs.