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Motif Batik Cdr Electronics Oklahoma

1 Jan 2000admin

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Motif Batik Cdr Electronics Oklahoma

• de Souza, Ana Luiza Ribeiro; Marra, Kayla; Gunn, Jason; Samkoe, Kimberley S; Hoopes, P Jack; Feldwisch, Joachim; Paulsen, Keith D; Pogue, Brian W 2017-02-01 Fluorescence guidance in surgical oncology provides the potential to realize enhanced molecular tumor contrast with dedicated targeted tracers, potentially with a microdose injection level. For most glioma tumors, the blood brain barrier is compromised allowing some exogenous drug/molecule delivery and accumulation for imaging. The aberrant overexpression and/or activation of epidermal growth factor receptor (EGFR) is associated with many types of cancers, including glioblastoma, and so the use of a near-infrared (NIR) fluorescent molecule targeted to the EGFR receptor provides the potential for improving tumor contrast during surgery. Fluorescently labeled affibody molecule (ABY-029) has high EGFR affinity and high potential specificity with reasonably fast plasma clearance. In this study, ABY-29 was evaluated in glioma versus normal brain uptake from intravenous injection at a range of doses, down to a microdose injection level. Nude rats were inoculated with the U251 human glioma cell line in the brain.

Tumors were allowed to grow for 3-4 weeks. ABY-029 fluorescence ex vivo imaging of brain slices was acquired at different time points (1-48 h) and varying injection doses from 25 to 122 μg/kg (from human protein microdose equivalent to five times microdose levels).

The tumor was most clearly visualized at 1-h post-injection with 8- to 16-fold average contrast relative to normal brain. However, the tumor still could be identified after 48 h. In all cases, the ABY-029 fluorescence appeared to localize preferentially in EGFR-positive regions. Increasing the injected dose from a microdose level to five times, a microdose level increased the signal by 10-fold, and the contrast was from 8 to 16, showing that there was value in doses slightly higher than the microdose restriction. Normal tissue uptake was found to be affected by the tumor size, indicating that edema was a likely factor affecting the expected tumor to normal tissue contrast.

These results suggest • Su, Xinhui; Cheng, Kai; Jeon, Jongho. 2014-06-27 The epidermal growth factor receptor (EGFR) serves as an attractive target for cancer molecular imaging and therapy. Our previous positron emission tomography (PET) studies showed that the EGFR-targeting affibody molecules 64Cu-DOTA-Z EGFR:1907 and 18F-FBEM-Z EGFR:1907 can discriminate between high and low EGFR-expression tumors and have the potential for patient selection for EGFR-targeted therapy. Compared with 64Cu, 18F may improve imaging of EGFR-expression and is more suitable for clinical application, but the labeling reaction of 18F-FBEM-Z EGFR:1907 requires a long synthesis time. The aim of the present study is to develop a new generation of 18F labeled affibody probes (Al 18F-NOTA-Zmore » EGFR:1907 and 18F-CBT-Z EGFR:1907) and to determine whether they are suitable agents for imaging of EGFR expression. The first approach consisted of conjugating Z EGFR:1907 with NOTA and radiolabeling with Al 18F to produce Al 18F-NOTA-Z EGFR:1907.