412例骨髓增殖性肿瘤的JAK2V617F突变检测及其临床意义

目的 研究JAK2V617F突变在慢性骨髓增殖性肿瘤(MPN)中的发生率及其与临床表现和并发症间的相关性.方法 采用等位基因特异性PCR方法,检测MPN中JAK2V617F的发生情况.结果 412例MPN患者中,JAK2V617F突变277例.JAK2V617F在原发性血小板增多症(ET)、特发性骨髓纤维化(IMF)和不能分类的骨髓增殖性疾病(MPD-U)中发生率分别为55.9%、66.7%和52.4%(P>0.05),均低于真性红细胞增多症(PV,95.6%),差异有统计学意义(P<0.05).JAK2突变型患者的平均年龄高于野生型患者(P<0.01);JAK2突变型患者的白细胞计数和血红蛋白水平均高于野生型患者(P<0.05);JAK2突变型患者中血管事件的发生率高于野生型患者(P<0.05);JAK2突变型的MPD-U患者较野生型患者更易进展为典型MPN(P<0.05);在301例行染色体检查的患者中,未发现核型异常与JAK2V617F表达之间存在相关性.结论 检测MPD-U患者中JAK2V617F的突变情况对疾病发展有提示作用;JAK2V617F突变与MPN患者年龄、外周血细胞计数及血管事件并发症相关.

Detection and clinical significance of JAK2 mutation in 412 patients with chronic myeloproliferative neoplasms

Objective To investigate the frequency of JAK2V617F mutation in Chinese patients with chronic myehiproliferative neoplasms (MPN) and to study the relationship between JAK2V617F mutation and clinical characteristics. Methods JAK2V617F mutation was screened by allele-specific polymerase chain reaction (AS-PCR). Results JAK2V617F mutation was detected in 277 of the 412 patients with MPN. The frequency of JAK2V617F mutation was similar among essential thrombocythernia (ET), idiopathic myelofibrosis (IMF) and chronic myeloproliferative diserders-unelasaified (MPD-U) (P >0.05), but it was significantly lower than that in polycythemia vera (PV) (P <0.05). The presence of JAK2V617F was found to be significantly correlative with advanced age at diagnosis (P <0.01) and with higher hemoglobin levels and higher leukocyte counts (P < 0.05). Significant difference was found in complication of vascular events between JAK2V617 positive and negative patients (P <0.05). JAK2V617F positive MPD-U patients were more prone to progress into typical MPN compared with JAK2V617F negative MPD-U patients. The association between abnormal karyotype and JAK2V617F was not found in cytogenetical analysis of 301 patients. Conclusion The presence of JAK2V617F in MPD-U is associated with the disease development. There is a correlation between JAK2V617F mutation in MPN and advanced age, higher leukocyte counts, hemoglobin level and vascular events.