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Ibrahim IK, Hassan R, Ali EW, Omer A. Polycythaemia Vera among Sudanese Patients with Special Emphasis on JAK2 Mutations. Asian Pac J Cancer Prev 2019; 20:41-44. [PMID: 30677867 PMCID: PMC6485582 DOI: 10.31557/apjcp.2019.20.1.41] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
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 12
had been described and shown capable of activating erythropoietin signaling pathways. Objective: In this study, we
aimed to determine the frequency of Jak2 mutations (JAK2V617F and JAK2 exon 12) as well as their relationships
with hematological parameters in Sudanese patients with myeloproliferative disorders (MPD). A comparison with
findings of published studies from other geographic regions was included. Materials and Methods: From each of
a total of 83 polycythaemia patients, six milliliters (ml) of venous blood were collected and processed for molecular
analysis and measurement of serum erythropoietin level by enzyme-linked immunoassay (ELISA). The JAK2 V617F
mutation 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 results
for EPO levels, nine (10.7 %) out of 83 patients were found to have secondary polycythaemia and 74 (89.3%) PV. The
overall 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 very
common in Sudanese PC cases.
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Affiliation(s)
- Ibrahim Khidir Ibrahim
- Department of Haematology, Faculty of Medical Laboratory Sciences, Al-Neelain University, Khartoum, Sudan.,Department of Haematology, School of Medical Sciences, University Sains Malaysia, Health Campus, 16150 Kubang Kerian, Kelantan, Malaysia.
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Hamadou WS, Bourdon V, Gaildrat P, Besbes S, Fabre A, Youssef YB, Regaieg H, Laatiri MA, Eisinger F, Mari V, Gesta P, Dreyfus H, Bonadona V, Dugast C, Zattara H, Faivre L, Jemni SY, Noguchi T, Khélif A, Sobol H, Soua Z. Mutational analysis of JAK2, CBL, RUNX1, and NPM1 genes in familial aggregation of hematological malignancies. Ann Hematol 2016; 95:1043-50. [DOI: 10.1007/s00277-016-2678-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Accepted: 04/16/2016] [Indexed: 02/07/2023]
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Nunes DPT, Lima LTD, Chauffaille MDL, Mitne-Neto M, Santos MTD, Cliquet MG, Guerra-Shinohara EM. CALR mutations screening in wild type JAK2(V617F) and MPL(W515K/L) Brazilian myeloproliferative neoplasm patients. Blood Cells Mol Dis 2015; 55:236-40. [PMID: 26227853 DOI: 10.1016/j.bcmd.2015.07.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Revised: 07/07/2015] [Accepted: 07/08/2015] [Indexed: 01/31/2023]
Abstract
Some myeloproliferative neoplasm (MPN) patients harbor JAK2(V617F) mutation, and CALR mutations were recently discovered in wild type (WT) JAK2(V617F). We evaluated the frequency and type of CALR mutations, and clinical and hematological characteristics in WT JAK2(V617F) and MPL(W515K/L) MPN patients. Sixty-five patients were included: 21 with primary myelofibrosis (PMF), 21 with myelofibrosis post-essential thrombocythemia (MPET) and 23 with essential thrombocythemia (ET). Screening for JAK2(V617F) and MPL(W515K/L) were performed using real-time PCR, while CALR mutations were analyzed by fragment analysis and Sanger sequencing. JAK2(V617F) was the most frequent mutation (54.5%) and one patient (1.5%) harbored MPL(W515L). CALR mutations were present in 38.1% of PMF, 12.5% of ET and 33.3% of MPET patients. Five types of CALR mutations were detected, among which type 1 (32.1%) and type 2 (21.4%) were found to be the most common. A novel CALR mutation in a PMF patient was found. Patients carrying CALR mutations had higher platelet count and less presence of splenomegaly than JAK2(V617F), while triple negatives had higher C-reactive protein levels than CALR mutant carriers. Screening for CALR mutations and its correlation with clinical features could be useful for the characterization of MPN patients and result in its incorporation into a new prognostic score.
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Affiliation(s)
- Daniela Prudente Teixeira Nunes
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas da Universidade de São Paulo, São Paulo, Brazil
| | - Luciene Terezina de Lima
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas da Universidade de São Paulo, São Paulo, Brazil
| | | | | | | | - Marcelo Gil Cliquet
- Departamento de Hematologia, Complexo Hospitalar de Sorocaba, Universidade Católica de São Paulo, Sorocaba, São Paulo, Brazil
| | - Elvira Maria Guerra-Shinohara
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas da Universidade de São Paulo, São Paulo, Brazil.
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Palandri F, Latagliata R, Polverelli N, Tieghi A, Crugnola M, Martino B, Perricone M, Breccia M, Ottaviani E, Testoni N, Merli F, Aversa F, Alimena G, Cavo M, Martinelli G, Catani L, Baccarani M, Vianelli N. Mutations and long-term outcome of 217 young patients with essential thrombocythemia or early primary myelofibrosis. Leukemia 2015; 29:1344-9. [PMID: 25801912 DOI: 10.1038/leu.2015.87] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Revised: 02/17/2015] [Accepted: 03/04/2015] [Indexed: 01/19/2023]
Abstract
We investigated the influence of molecular status on disease characteristics and clinical outcome in young patients (⩽ 40 years) with World Health Organization (WHO)-defined essential thrombocythemia (ET) or early/prefibrotic primary myelofibrosis (early-PMF). Overall, 217 patients with ET (number 197) and early-PMF (number 20) were included in the analysis. Median follow-up time was 10.2 years. The cumulative incidence of thrombosis, hemorrhages and disease evolution into myelofibrosis/acute leukemia were 16.6%, 8.6% and 3% at 15 years, respectively. No differences were detectable between ET and early-PMF patients, although the latter cohort showed a trend for worse combined-event free survival (EFS). Mutation frequency were 61% for JAK2V617F, 25% for CALR and 1% for MPLW515K, and were comparable across WHO diagnosis; however, JAK2V617F allele burden was higher in the early-PMF group. Compared with JAK2V617F-positive patients, CALR-mutated patients displayed higher platelet count and lower hemoglobin level. CALR mutations significantly correlated with lower thrombotic risk (9.1% versus 21.7%, P = 0.04), longer survival (100% versus 96%, P = 0.05) and better combined-EFS (86% versus 71%, P = 0.02). However, non-type 1/type 2 CALR mutations ('minor' mutations) and abnormal karyotype were found to correlate with increased risk of disease evolution. At last contact, six patients had died; in five cases, the causes of death were related to the hematological disease and occurred at a median age of 64 years (range: 53-68 years). Twenty-eight patients (13%) were unmutated for JAK2, CALR and MPL: no event was registered in these 'triple-negative' patients.
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Affiliation(s)
- F Palandri
- Department of Experimental, Diagnostic and Specialty Medicine, Institute of Hematology 'L. and A. Seràgnoli', University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy
| | - R Latagliata
- Department of Cellular Biotechnologies and Hematology, Sapienza University, Rome, Italy
| | - N Polverelli
- Department of Experimental, Diagnostic and Specialty Medicine, Institute of Hematology 'L. and A. Seràgnoli', University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy
| | - A Tieghi
- Division of Hematology, Azienda Ospedaliera Arcispedale Santa Maria Nuova, Reggio Emilia, Italy
| | - M Crugnola
- Section of Hematology and BMT Unit, Department of Clinical and Experimental Medicine, University of Parma, Parma, Italy
| | - B Martino
- Division of Hematology, Azienda Ospedaliera 'Bianchi Melacrino Morelli', Reggio Calabria, Italy
| | - M Perricone
- Department of Experimental, Diagnostic and Specialty Medicine, Institute of Hematology 'L. and A. Seràgnoli', University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy
| | - M Breccia
- Department of Cellular Biotechnologies and Hematology, Sapienza University, Rome, Italy
| | - E Ottaviani
- Department of Experimental, Diagnostic and Specialty Medicine, Institute of Hematology 'L. and A. Seràgnoli', University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy
| | - N Testoni
- Department of Experimental, Diagnostic and Specialty Medicine, Institute of Hematology 'L. and A. Seràgnoli', University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy
| | - F Merli
- Division of Hematology, Azienda Ospedaliera Arcispedale Santa Maria Nuova, Reggio Emilia, Italy
| | - F Aversa
- Section of Hematology and BMT Unit, Department of Clinical and Experimental Medicine, University of Parma, Parma, Italy
| | - G Alimena
- Department of Cellular Biotechnologies and Hematology, Sapienza University, Rome, Italy
| | - M Cavo
- Department of Experimental, Diagnostic and Specialty Medicine, Institute of Hematology 'L. and A. Seràgnoli', University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy
| | - G Martinelli
- Department of Experimental, Diagnostic and Specialty Medicine, Institute of Hematology 'L. and A. Seràgnoli', University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy
| | - L Catani
- Department of Experimental, Diagnostic and Specialty Medicine, Institute of Hematology 'L. and A. Seràgnoli', University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy
| | - M Baccarani
- Department of Experimental, Diagnostic and Specialty Medicine, Institute of Hematology 'L. and A. Seràgnoli', University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy
| | - N Vianelli
- Department of Experimental, Diagnostic and Specialty Medicine, Institute of Hematology 'L. and A. Seràgnoli', University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy
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