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Παρασκευή 30 Ιουνίου 2017

Inflammation and myeloproliferative neoplasms

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Publication date: Available online 30 June 2017
Source:Journal of Autoimmunity
Author(s): Federico Lussana, Alessandro Rambaldi
Myeloproliferative neoplasms (MPN) include three main entities: Polycythemia Vera (PV), Essential Thrombocythemia (ET), and Myelofibrosis (MF). MPN represent a unique model of the relationship between the clonal development of a hematologic malignancy and chronic inflammation. The neoplastic clone is the main driver of this inflammatory reaction as demonstrated by the curative effect of allogeneic stem cell transplantation which leads not only to a complete restore of the hematopoiesis, but also to regression of bone marrow fibrosis. The neoplastic clone and its differentiated progeny are also the main source of an indirect paracrine secretion of inflammatory cytokines released by different normal cells present within the tumor microenvironment. In the end, the cytokine storm within the bone marrow niche leads to fibrosis. In addition, chronic inflammation is responsible of the constitutional symptoms which negatively affect the quality of life of MPN patients and represents a major driver for the development of premature atherosclerosis and disease progression. Here we describe the available data about the link between MPN and chronic inflammation in animal models as well as in clinical studies. We also review the practical value of including acute phase inflammatory proteins such as high sensitivity C-reactive protein (hs-CRP) and pentraxin 3 (PTX-3) in prognostic stratification of MPN patients. Interestingly, the plasma levels of these proteins is often increase in MPN patients and this may be important when considering the well-established link between these two inflammatory proteins and the risk of both arterial and venous thrombosis. Although the available drugs are unable to eradicate the malignant clone, the ability to identify patient with a high inflammatory burden and an adverse molecular profile is important to advise therapy with ruxolitinib or even allogeneic stem cell transplantation that currently represents the only potentially curative option for these diseases.



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