Current Treatment Options in Oncology

, Volume 15, Issue 2, pp 147–156 | Cite as

Jak-2 Positive Myeloproliferative Neoplasms

Leukemia (JP Dutcher, Section Editor)

Opinion statement

Originally described by Dameshek in 1951, myeloproliferative disorders are today classified as myeloproliferative Neoplasms (MPNs) in WHO’s Classification of Tumors of Hematopoietic and Lymphoid Tissues. The term includes a range of conditions, [ie, BCR-ABL-positive chronic myelogenous leukemia (CML), chronic neutrophilic leukemia (CNL), polycythemia vera (PV), primary myelofibrosis (PMF), essential thromobocythemia (ET), chronic eosinophilic leukemia not otherwise specified (CEL-NOS), mastocytosis, and unclassifiable myeloproliferative neoplasm]. In the specific case of CML, a better understanding of the pathogenesis and pathophysiology of the disease has led to a targeted therapy. The presence of chromosome Philadelphia, t(9;22)(q34;11) results in the oncogene BCR-ABL, which characterizes the disease; this molecular rearrangement gives rise to a tyrosine-kinase, which in turn triggers the proliferation of the myeloid line through the activation of the signaling pathways downstream. Tyrosine-kinase inhibitors (TKIs) have altered the therapy and monitoring of CML patients and improved both their prognosis and quality of life. In 2005, various groups of investigators described a new point mutation of the gene JAK2 associated to MPNs. Although the presence of this mutation has led to a modification in the diagnostic criteria of these conditions, the impact of the use of JAK2 inhibitors on the prognosis and course of the disease continues to be controversial.


Myeloproliferative neoplasms Chronic myelogenous meukemia (CML) Chronic neutrophilic leukemia (CNL) Polycythemia vera (PV) Primary myelofibrosis (PMF) Essential thromobocythemia JAK2 JAK2 inhibitors Ruxolitinib 


Compliance with Ethics Guidelines

Conflict of Interest

Pablo J. Muxí had travel/accommodations expenses covered or reimbursed by Novartis. Ana Carolina Oliver declares that she has no conflict of interest.

Human and Animal Rights and Informed Consent

This article does not contain any studies with human or animal subjects performed by any of the authors.

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© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Department of HaematologyBritish HospitalMontevideoUruguay

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