Prevalence of the Janus kinase 2 V617F mutation in Philadelphia‑negative myeloproliferative neoplasms in a Portuguese population

Azevedo,Ana Paula; Silva,Susana   N.; Reichert,Alice; Lima,Fernando; Júnior,Esmeraldina; Rueff,José

doi:10.3892/br.2017.977

Prevalence of the Janus kinase 2 V617F mutation in Philadelphia‑negative myeloproliferative neoplasms in a Portuguese population

Authors:
- Ana Paula Azevedo
- Susana N. Silva
- Alice Reichert
- Fernando Lima
- Esmeraldina Júnior
- José Rueff
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Affiliations: Centre for Toxicogenomics and Human Health (ToxOmics), Genetics, Oncology and Human Toxicology, NOVA Medical School, Faculty of Medical Sciences, NOVA University of Lisbon, 1169‑056 Lisbon, Portugal, Department of Clinical Hematology, Hospital of São Francisco Xavier, West Lisbon Hospital Centre, 1449‑005 Lisbon, Portugal, Department of Clinical Pathology, Hospital of São Francisco Xavier, West Lisbon Hospital Centre, 1449‑005 Lisbon, Portugal
Published online on: September 5, 2017 https://doi.org/10.3892/br.2017.977
Pages: 370-376

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Abstract

Myeloproliferative neoplasms (MPNs) result from the malignant transformation of a hematopoietic stem‑cell (HSC), leading to abnormal amplification and proliferation of myeloid lineages. Identification of the Janus kinase 2 (JAK2) V617F mutation developed the knowledge of Philadelphia‑negative (PN)‑MPNs, contributing to and influencing the definition of the phenotype and prognostic impact. Considering the lack of Portuguese epidemiological data, the present study intends to characterize the prevalence of the JAK2 mutation in a PN‑MPN versus a control Portuguese population. Caucasian Portuguese PN‑MPN patients (n=133) and 281 matched control subjects were investigated. No significant differences were identified between the case and control groups concerning age distribution or smoking habits. Pathology distribution was as follows: 60.2% with essential thrombocythemia (ET), 29.3% with polycythemia vera (PV) and 10.5% with primary myelofibrosis (PMF). A total of 75.0% of patients were positive for the presence of the JAK2 V617F mutation. In addition, the prevalence of PV was 87.2%, ET was 73.4% and PMF was 50.0%. The JAK2 V617F mutation is observed in various MPN phenotypes, and has an increased incidence in ET patients and a decreased incidence in PV patients. These data may contribute to improving the knowledge of the pathophysiology of these disorders, and to a more rational and efficient selection of therapeutic strategies to be adopted, notably because most of the patients are JAK2 V617F negative.

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