Effects of Imatinib, Nilotinib, Dasatinib on VEGF and VEGFR-1 Levels in Patients with Chronic Myelogenous Leukemia

Objective: Vascular endothelial growth factor (VEGF) is a protein that binding to VEGF receptors 1 (VEGFR-1) and accelerates angiogenesis. The relationship between angiogenesis and progression of tumors were observed in both solid and hematologic cancers. Monoclonal antibodies capable of inhibiting angiogenesis, tyrosine kinase inhibitors use for haematological cancer treatment. In this study; we investigated the effects of Imatinib mesylate (STI-571; Gleevec), Nilotinib (AMN107; Tasigna) and Dasatinib (BMS-354825; Sprycell) on serum levels of VEGF and VEGFR-1, in patients with chronic phase of chronic myeloid leukemia (CML). Method: Serum levels of VEGF and VEGFR-1 were measured in 65 patients with chronic phase of CML. Serum VEGF and VEGFR-1 levels were determined using quantitative sandwich enzyme immunoassay technique according to the manufacturers' instructions. Results: There were 33 (51%) male and 32 (49%) female patients in this study. 38 of 65 patients were using Imatinib, 15 Nilotinib, 12 Dasatinib. Mean serum VEGF and VEGFR-1 levels for the 65 patients with CML were 172.21+/-127.46 pg/mL and 199.62+/-122.22 pg/mL, respectively. In Dasatinib and Imatinib group, serum VEGF and VEGFR-1 levels were significantly higher than in control group (p= 0.008, p< 0.0001, and p< 0.0001, p< 0.0001). In Nilotinib group, serum VEGF levels were higher than control group, but; it was not statistically significant (p= 0.06) while. VEGFR-1 levels were significantly higher than those of controls (p< 0.0001). Conclusion: Imatinib, Nilotinib and Dasatinib were not superior to each other regarding to serum VEGF and VEGFR-1, but it may be said that Nilotinib may has slightly more effect on inhibition of anjiogenesis

A multicenter experience of thrombotic microangiopathies in Turkey: The Turkish Hematology Research and Education Group (ThREG)-TMA01 study

Thrombotic microangiopathies (TMAs) are rare, but life-threatening disorders characterized by microangiopathic hemolytic anemia and thrombocytopenia (MAHAT) associated with multiorgan dysfunction as a result of microvascular thrombosis and tissue ischemia. The differentiation of the etiology is of utmost importance as the pathophysiological basis will dictate the choice of appropriate treatment

The Turkish perspective on apheresis activity: The Turkish apheresis registry report

Therapeutic apheresis is an extracorporeal treatment that selectively removes abnormal cells or harmful substances in the blood that are associated with or cause certain diseases. During the last decades the application of therapeutic apheresis has expanded to a broad spectrum of hematological and non-hematological diseases due to various studies on the clinical efficacy of this procedure. In this context there are more than 30 centers performing therapeutic apheresis and registered in the apheresis database in Turkey. Herein, we, The Turkish Apheresis Registry, aimed to analyze some key articles published so far from Turkey regarding the use of apheresis for various indications