|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
The frequency of V617F was 65 percent among patients with polycythemia vera (83 of 128), 57 percent among patients with idiopathic myelofibrosis (13 of 23), and 23 percent among patients with essential thrombocythemia (21 of 93).
|
15858187 |
2005 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
Our results suggest that JAK2 V617F-positive essential thrombocythaemia and polycythaemia vera form a biological continuum, with the degree of erythrocytosis determined by physiological or genetic modifiers.
|
16325696 |
2005 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
Therefore, by necessity, any discussion of PV must take into consideration these companion myeloproliferative disorders, and since erythrocytosis is the single clinical feature that sets PV apart from IMF and ET, it is clear that the presence of the JAK2 V617F</span> mutation cannot by itself establish a diagnosis of PV.
|
16210034 |
2005 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
In order to explore the correlation between these two biological markers and compare their diagnostic utility, mutation analysis for JAK2(V617F) and quantitative measurement of granulocyte PRV-1 expression were performed on the same study sample from 100 participants: 38 with PV, 22 with essential thrombocythaemia (ET), 10 with agnogenic myeloid metaplasia (AMM), 19 with secondary polycythaemia (SP) and 11 healthy volunteers.
|
16197445 |
2005 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
Therefore, although the presence of JAK2(V617F) in ET appears to promote a PV phenotype, it might not carry treatment-relevant information.
|
16197451 |
2005 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
A point mutation in the Janus kinase 2 exchanging a valine for a phenylalanine at position 617 (JAK2 V617F) was found in 65% to 97% of polycythemia vera (PV) patients, as well as in approximately 50% of essential thrombocythemia (ET) and idiopathic myelofibrosis (IMF) patients.
|
16210033 |
2005 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
The detection rate of JAK2 V617F mutants for polycythemia vera, chronic idiopathic myelofibrosis, and essential thrombocythemia (n = 103) was similar to the previously reported results.
|
16741247 |
2006 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
Moreover, allelic ratios higher than 50% JAK2-V617F, indicating the presence of granulocytes homozygous for JAK2-V617F, were found in 70% of PV at diagnosis but never in ET.
|
16728702 |
2006 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
The V617F mutation was detected in 27 of 28 (96%) cases of polycythemia vera, 17 of 23 (74%) cases of essential thrombocythemia, 28 of 45 (62%) cases of chronic idiopathic myelofibrosis, six of eight (75%) cases of CMPD unclassified, and two of four (50%) cases of myelodysplastic/myeloproliferative syndrome.
|
16825501 |
2006 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
The JAK2(V617F) mutation is present in almost all patients with polycythemia vera (PV), large proportions of patients with essential thrombocythemia and idiopathic myelofibrosis, and less frequently in atypical myeloproliferative disorders (MPD).
|
17145859 |
2006 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
A retrospective investigation of the JAK2 V617F mutation was carried out in DNA samples from 131 bone marrow (BM) core biopsy specimens corresponding to patients with polycythemia vera (PV) (n = 31), essential thrombocythemia (ET) (n = 31), chronic idiopathic myelofibrosis (CIM) (n = 18), as well as patients with normal BM and secondary reactive hyperplasia.
|
16949922 |
2006 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
Direct sequencing and DHPLC were relatively insensitive assays for mutation detection, together identifying only 53% of the JAK2 V617F positive cases of ET.
|
16916724 |
2006 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
The clinical and pathological data on JAK2 V617F-positive MPD patients suggest that the JAK2 V617F mutation defines one disease entity with several sequential steps of ET, PV, and secondary myelofibrosis during long-term follow-up, and that the wild-type JAK2 MPDs may represent another distinct entity with a related but different molecular etiology.
|
16810609 |
2006 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
Fli-1 mRNA expression was significantly higher in Essential thrombocythaemia (ET) with JAK2 (V617F) compared with other Ph(-) CMPD and control (P < 0.001).
|
16930139 |
2006 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
An acquired translocation in JAK2 Val617Phe-negative essential thrombocythemia associated with autosomal spread of X-inactivation.
|
16885051 |
2006 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
An activating JAK2 mutation (JAK2 V617F) is present in the chronic myeloproliferative disorders (MPDs), polycythemia vera (PV), idiopathic myelofibrosis (IMF), and essential thrombocytosis (ET).
|
16912229 |
2006 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
JAK2 V617F-positive ET/PV and CIMF should be distinguished from wild-type JAK2 ET, rare cases of PV, and CIMF, and should be evaluated during life-long follow-up.
|
16810614 |
2006 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
Most patients with polycythemia vera and half with idiopathic myelofibrosis and essential thrombocythemia have an acquired V617F mutation in JAK2.
|
16293597 |
2006 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
Although it is in vogue to consider essential thrombocythemia as more than one disease in terms of both molecular phenotype (presence or absence of JAK2(V617F)) and putative pattern of myelopoiesis (monoclonal versus polyclonal), it is yet to be shown that such differences influence either the natural history of the disease or current therapy.
|
16456375 |
2006 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
A 52-year-old man developed essential thrombocythemia (ET) with JAK2 V617F mutation after orthotopic liver transplantation (OLT).
|
16929538 |
2006 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
To study the prevalence of the Val617Phe JAK2 mutation in familial cases of myeloproliferative disorder (MPD) and its possible implication as a predisposing genetic factor, we analyzed 72 families including 174 patients (81 polycythemia vera [PV], 68 essential thrombocythemia [ET], 11 myelofibrosis with myeloid metaplasia [MMM], 12 chronic myeloid leukemia), 1 systemic mastocytosis, and 1 chronic myelomonocytic leukemia (CMML).
|
16537803 |
2006 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
A missense somatic mutation in JAK2 gene (JAK2 V617F) has recently been reported in chronic myeloproliferative disorders, including polycythemia vera, essential thrombocythemia and myelofibrosis with myeloid metaplasia, strongly suggesting its role in the pathogenesis of myeloid disorders.
|
16247455 |
2006 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
The lack of thrombocytosis suggests that additional events may be required for JAK2 V617F to cause ET, but qualitative platelet abnormalities induced by JAK2 V617F may contribute to the hemostatic complications of PV.
|
17183644 |
2006 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
V617F-positive erythroid burst-forming units (BFU-Es) were more frequent in patients with PV compared with patients with ET (P = .022) and, strikingly, V617F-homozygous BFU-Es were detected in all 17 patients with PV, but in none of the patients with ET (P < .001).
|
16772604 |
2006 |
|
Thrombocythemia, Essential
|
|
0.100 |
GeneticVariation
|
BEFREE |
The somatic JAK2 valine-to-phenylalanine (V617F) mutation has been detected in up to 90% of patients with polycythemia and in a sizeable proportion of patients with other myeloproliferative disorders such as essential thrombocythemia and idiopathic myelofibrosis.
|
17317861 |
2007 |