BCR-ABL阴性骨髓增殖性肿瘤JAK2 V617F基因突变状态及负荷的临床意义

目的探讨JAK2 V617F基因突变状态及负荷对BCR-ABL阴性骨髓增殖性肿瘤(MPN)的影响。方法回顾性分析2015年9月至2020年1月河北省沧州市中心医院199例MPN患者的临床资料。分析JAK2 V617F突变负荷与MPN患者临床病理特征及预后评分的关系。结果199例BCR-ABL阴性MPN患者中JAK2 V617F突变阳性138例(69.4%);其中,72例真性红细胞增多症(PV)患者中突变阳性64例(88.9%),101例原发性血小板增多症(ET)患者中突变阳性54例(53.5%),25例骨髓纤维化(MF)患者中突变阳性20例(80.0%),1例嗜酸粒细胞增多症(HES)患者突变阳性。JAK2 V617F突变高负荷者占55.1%(76/138)。突变负荷最高的类型为PV,MF次之,ET最低,3组突变负荷分别为(73.9±18.3)%、(59.9±25.2)%、(25.0±16.5)%。JAK2 V617F突变负荷与PV、ET、MF患者的白细胞计数均呈正相关(r值分别为0.626、0.675、0.796,均P<0.01)。JAK2 V617F突变负荷与PV、ET患者的预后评分均呈正相关(r值分别为0.296、0.404,均P<0.05)。结论BCR-ABL阴性MPN患者JAK2 V617F突变负荷与临床病理因素相关,JAK2 V617F突变高负荷患者预后不良。     

Study of CALR,MPL, and c-kit Gene Mutations in Thai Patients with JAK2 V617F Negative Myeloproliferative Neoplasms

Objective: The aim of this study to determine the prevalence of CALR, MPL and c-kit gene mutations in JAK2 V617F negative-MPN patients. Methods: The retrospective study of CALR, MPL and c-kit mutations were analyzed in 113 samples collected from March 2010 to May 2017 and identified as JAK2 V617F–negative MPN Thai patients. The samples were analysis by gel electrophoresis and direct sequencing. Results: 28.3% of JAK2 V617F–negative MPN patients showed CALR gene mutations. Within the MPN patients with CALR mutation, 46.9% were classified as essential thrombocythemia (ET) and 20.9% were classified as primary myelofibrosis (PMF). Previous studies classified CALR mutations into three types using negatively charged amino acid stretches at the C-terminal domain. Type 1-like mutations were observed in 12 of 49 (24.5%) ET patients and type 2-like mutations were observed in 10 of 49 (20.4%) patients. In addition, 8 of 43 (18.6%) PMF patients showed type 1-like mutations and 1 of 43 (2.3%) showed type 2-like CALR mutation. Interestingly, platelet counts were higher in patients with CALR gene mutation than in patients without CALR gene mutation. MPL mutations (W515K and W515L) were identified in 2 of 109 (1.8%) MPN patients; the MPL mutations were only found in ET patients, which was consistent with previous studies. We did not detect exon 17 c-kit mutation in JAK2-negative MPN patients but detected intronic single nucleotide polymorphisms at c.74,978 and c.75,255 in these samples. Approximately 66% of patients did not have mutations in CALR and MPL genes, in addition to lacking JAK2 gene mutation, and these cases are classified as triple-mutations. Conclusion: Our results showed that 66% of cases were triple-negative mutation MPN because they lacked mutations in JAK2, CALR and MPL genes. The frequencies of CALR and MPL mutation in this study are similar to other CALR and MPL patient data.     

JAK2 mutations and clinical practice in myeloproliferative neoplasms

With the discovery in the last 3 years of novel Janus kinase 2 (JAK2) and thrombopoietin receptor (MPL) mutations, the pathogenetic understanding of and clinical practice for myeloproliferative neoplasms (MPNs) have entered a new era. Each one of these newly discovered mutations, including JAK2V617F, MPLW515L, and a JAK2 exon 12 mutation, has been shown to result in constitutive activation of JAK-STAT signaling and also induce a MPN phenotype in mice. Thus, JAK2 is now considered to be a legitimate target for drug development in MPNs, and small molecule JAK2 inhibitors have already gone through successful preclinical testing, and early-phase human trials in primary myelofibrosis have already begun. Furthermore, JAK2 mutation screening has now become a front-line diagnostic test in the evaluation of both "erythrocytosis" and thrombocytosis and the 2001 World Health Organization diagnostic criteria for polycythemia vera, essential thrombocythemia, and primary myelofibrosis have now been revised to incorporate JAK2V617F mutation screening.     

Polycythaemia Vera among Sudanese Patients with Special Emphasis on JAK2 Mutations

Background: In recent years, a somatic point mutation in the Janus Kinase 2 (JAK2) gene (1849 G→T, V617F)has been reported to occur in over 90% of patients with polycythemia vera (PV). Another JAK2 mutation in exon 12had been described and shown capable of activating erythropoietin signaling pathways. Objective: In this study, weaimed to determine the frequency of Jak2 mutations (JAK2V617F and JAK2 exon 12) as well as their relationshipswith hematological parameters in Sudanese patients with myeloproliferative disorders (MPD). A comparison withfindings of published studies from other geographic regions was included. Materials and Methods: From each ofa total of 83 polycythaemia patients, six milliliters (ml) of venous blood were collected and processed for molecularanalysis and measurement of serum erythropoietin level by enzyme-linked immunoassay (ELISA). The JAK2 V617Fmutation was determined using an allele-specific competitive blocker (ACB) -PCR assay and High Resolution Melting(HRM) analysis was applied for the JAK2 exon 12 mutation. Results: According to patients’ history and the resultsfor EPO levels, nine (10.7 %) out of 83 patients were found to have secondary polycythaemia and 74 (89.3%) PV. Theoverall frequency of the 2 JAK2 mutations was 94.6% in our Sudanese PV patients, JAK2V617F being found in 91%and JAK2 exon 12 mutations in 8.1%.Conclusion: In summary JAK2 V617F and JAK2 exon 12 mutations are verycommon in Sudanese PC cases.     

Coexisting JAK2V617F and CALR Exon 9 Mutations in Myeloproliferative Neoplasms - Do They Designate a New Subtype?

The classic BCR-ABL1-negative myeloproliferative neoplasm is an operational sub-category of MPNs that includes polycythemia vera (PV), essential thrombocythemia (ET), and primary myelofibrosis (PMF). The JAK2V617F mutation is found in ~ 95% of PV and 50-60% of ET or PMF. In most of the remaining JAK2V617F- negative PV cases, JAK2 exon 12 mutations are present. Amongst the JAK2V617F-negative ET or PMF 5-10% of patients carry mutations in the MPL gene. Prior to 2013, there was no specific molecular marker described in the remaining 30-40% ET and PMF. In December 2013, two research groups independently reported mutations in the gene CALR found specifically in ET (67-71%) and PMF (56-88%) but not in PV. Initially CALR mutations were reported mutually exclusive with JAK2 or MPL. However, co-occurrence of CALR mutations with JAK2V617F has been reported recently in a few MPN cases. Many studies have reported important diagnostic and prognostic significance of CALR mutations in ET and PMF patients and CALR mutation screening has been proposed to be incorporated into WHO diagnostic criteria for MPN. It is suggestive in diagnostic workup of MPN that CALR mutations should not be studied in MPN patients who carry JAK2 or MPL mutations. However JAK2V617F and CALR positive patients might have a different phenotype and clinical course, distinct from the JAK2-positive or CALR-positive subgroups and identification of the true frequency of these patients may be an important factor for defining the prognosis, risk factors and outcomes for MPN patients.     

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.     

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.     

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.     

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.     

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.     

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.     

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.     

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.     

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.     

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.     

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.     

Molecular heterogeneity of familial myeloproliferative neoplasms revealed by analysis of the commonly acquired JAK2, CALR and MPL mutations

The myeloproliferative neoplasms (MPN) are clonal, hematological malignancies that include polycythemia vera, essential thrombocythemia and primary myelofibrosis. While most cases of MPN are sporadic in nature, a familial pattern of inheritance is well recognised. The phenotype and status of the commonly acquired JAK2 V617F, CALR exon 9 and MPL W515L/K mutations in affected individuals from a consecutive series of ten familial MPN (FMPN) kindred are described. Affected individuals display the classical MPN phenotypes together with one kindred identified suggestive of hereditary thrombocytosis. In affected patients the JAK2 V617F mutation is the most commonly acquired followed by CALR exon nine mutations with no MPL W515L/K mutations detected. The JAK2 V617F and CALR exon 9 mutations appear to occur at approximately the same frequency in FMPN as in the sporadic forms of these diseases. The familial nature of MPN may often be overlooked and accordingly more common than previously considered. Characterisation of these FMPN kindred may allow for the investigation of molecular events that contribute to this inheritance.     

JAK1/2抑制剂治疗骨髓增殖性肿瘤的研究进展

bcr-abl阴性的骨髓增殖性肿瘤(MPN)包括真性红细胞增多症(PV)、原发性血小板增多症(ET)和原发性骨髓纤维化(PMF).随着JAK2 V617F基因突变在MPN患者中的发现,一系列针对该突变的小分子靶向药物被研发,其中通过COMFORT-Ⅰ和COMFORT-Ⅱ等试验研究的JAK1/2抑制剂芦可替尼(ruxolitinib)已经被美国食品和药品管理局(FDA)和欧洲药品管理局(EMA)批准应用于中晚期PMF患者和羟基脲耐药或不耐受PV患者的治疗,给MPN患者带来了新的希望.     

JAK2, CALR,and MPL Mutations in Egyptian Patients With Classic Philadelphia-negative Myeloproliferative Neoplasms

BackgroundGenetic mutations have been proven to be one of the major criteria in the diagnosis and distinction of different myeloproliferative neoplasm (MPN) subtypes. Therefore, the aim of this study was to determine the molecular profile of Egyptian patients with MPN subtypes and correlate with clinicopathological status.MethodsA series of 200 patients with MPNs (92 polycythemia vera, 68 essential thrombocythemia, and 40 primary myelofibrosis) were included in this study. DNA from each sample was amplified using polymerase chain reaction to detect Janus kinase 2 (JAK2), calreticulin (CALR), and myeloproliferative leukemia virus oncogene (MPL) mutations. Sanger sequencing was used to determine the mutation types.ResultsOf the 200 samples, 44% had JAK2V617F and 10% were carrying CALR mutation with type 2 being the most frequent type in this study (55%). No MPL or JAK2 exon 12 mutations were detected. All clinical and hematological data had no differences with other populations except that our CALR-positive patients showed a decrease in the platelet count compared with JAK2V617F-positive patients.ConclusionOur study on Egyptian patients shows a specific molecular profile of JAK2 mutation, and CALR mutation type 2 was higher than type 1.