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• W2969442018 abstract "Bevacizumab (BEV), an antiangiogenic agent, induces dramatic normalization of the tumor vasculature in glioblastoma. This study aimed to clarify how one-time administration of BEV changes histological features in glioblastoma and how histological changes affect the uptake of 11C-methyl-L-methionine (11C-met) as an amino-acid tracer.Subjects were 18 patients with newly diagnosed glioblastoma who were assigned to two groups: BEV group, single intravenous administration of BEV before surgical tumor removal; and control group, surgical tumor removal alone. After surgery, we compared the densities of tumor cells and microvessels, and microvascular structures including vascular pericytes and L-type amino acid transporter-1 (LAT1) between the BEV and control groups. Correlations between 11C-met uptake on positron emission tomography before surgery, microvascular density, and LAT1 expression were assessed in each group.BEV induced significant reductions in microvascular density, while tumor cell density and proliferation were retained in the BEV group. Percentages of vessels with pericytes and vascular endothelium with LAT1 expression were lower in the BEV group than in controls. Uptake of 11C-met correlated significantly with microvascular density in the BEV group but not with LAT1expression.The present study showed that even one course of BEV administration induced reductions in microvessels, vascular pericytes, and LAT1 expression in glioblastomas. One course of BEV therapy also reduced 11C-met uptake, which might have been largely attributed to reductions in microvessels rather than reductions in LAT1 expression." @default.
• W2969442018 created "2019-08-29" @default.
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• W2969442018 date "2019-11-01" @default.
• W2969442018 modified "2023-10-17" @default.
• W2969442018 title "Impacts on Histological Features and 11C-Methyl-L-methionine Uptake After “One-Shot” Administration with Bevacizumab Before Surgery in Newly Diagnosed Glioblastoma" @default.
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• W2969442018 doi "https://doi.org/10.1016/j.tranon.2019.08.002" @default.
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