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Reproducibility and repeatability of 18F-(2S, 4R)-4-fluoroglutamine PET imaging in preclinical oncology models.
PLoS One
January 2025
Vanderbilt Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, United States of America.
Introduction: Measurement of repeatability and reproducibility (R&R) is necessary to realize the full potential of positron emission tomography (PET). Several studies have evaluated the reproducibility of PET using 18F-FDG, the most common PET tracer used in oncology, but similar studies using other PET tracers are scarce. Even fewer assess agreement and R&R with statistical methods designed explicitly for the task.
View Article and Find Full Text PDFBackground: Intrathecally (IT) delivered antisense oligonucleotides (ASOs) are promising therapies that can reduce tau pathology in Alzheimer's Disease (AD). However, current plasma and CSF sampling methods to estimate brain tissue exposure of ASOs are inherently limited, hampering ASO clinical developmental plans. We developed the PET tracer [F]BIO-687, which binds ASO conjugates (ASO-Tz) in vivo, allowing us to image ASO distribution in a living brain using "pretargeted" imaging.
View Article and Find Full Text PDFBiomarkers.
Alzheimers Dement
December 2024
Translational Neuroimaging Laboratory, The McGill University Research Centre for Studies in Aging, Montréal, QC, Canada.
Background: To evaluate the in vitro binding properties of [C]PiB and [F]NAV4694 head-to-head in post-mortem human brain tissue.
Method: Autoradiography was used to assess uptake of [C]PiB and [F]NAV4694 in control (CN) and Alzheimer's disease (AD) autopsy-confirmed brain tissues. The study focuses on the analysis of the prefrontal cortex, inferior parietal cortex, posterior cingulate cortex and hippocampus sections in 11 CN and 11 AD cases.
Biomarkers.
Alzheimers Dement
December 2024
Wake Forest University School of Medicine, Winston-Salem, NC, USA.
Background: Insulin resistance (IR) is associated with abnormal tau-phosphorylation and IR markers in AD brain co-localize with neurofibrillary tangles. One strategy to overcome brain IR is to increase brain insulin is via intranasal insulin (INI) administration using specialized intranasal devices that deliver insulin to the brain. Our recent INI vs.
View Article and Find Full Text PDFBackground: Different PET tracers can be used to measure neuritic amyloid plaque deposition in human brain. While mean cortical-to-cerebellar standard uptake value ratios (SUVRs) generated using different radiotracer methods can be transformed into Centiloid measurements to facilitate comparisons among the resulting amyloid plaque measurements, the level of agreement as measured by the strength of the correlation between the measurements does not change. In this study, paired 18F-labeled (i.
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