Positron emission tomography (PET) using fluorine-18 (F)-labeled 2-nitroimidazole radiotracers has proven useful for assessment of tumor oxygenation. However, the passive diffusion-driven cellular uptake of currently available radiotracers results in slow kinetics and low tumor-to-background ratios. With the aim to develop a compound that is actively transported into cells, 1-(6'-deoxy-6'-[F]fluoro-β-d-allofuranosyl)-2-nitroimidazole (β-[F]1), a putative nucleoside transporter substrate, was synthetized by nucleophilic [F]fluoride substitution of an acetyl protected labeling precursor with a tosylate leaving group (β-6) in a final radiochemical yield of 12±8% (n=10, based on [F]fluoride starting activity) in a total synthesis time of 60min with a specific activity at end of synthesis of 218±58GBq/μmol (n=10). Both radiolabeling precursor β-6 and unlabeled reference compound β-1 were prepared in multistep syntheses starting from 1,2:5,6-di-O-isopropylidene-α-d-allofuranose. In vitro experiments demonstrated an interaction of β-1 with SLC29A1 and SLC28A1/2/3 nucleoside transporter as well as hypoxia specific retention of β-[F]1 in tumor cell lines. In biodistribution studies in healthy mice β-[F]1 showed homogenous tissue distribution and excellent metabolic stability, which was unaffected by tissue oxygenation. PET studies in tumor bearing mice showed tumor-to-muscle ratios of 2.13±0.22 (n=4) at 2h after administration of β-[F]1. In ex vivo autoradiography experiments β-[F]1 distribution closely matched staining with the hypoxia marker pimonidazole. In conclusion, β-[F]1 shows potential as PET hypoxia radiotracer which merits further investigation.
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http://dx.doi.org/10.1016/j.bmc.2016.08.053 | DOI Listing |
Ann Surg Oncol
January 2025
Division of Colorectal Surgery, Changzheng Hospital, Navy Medical University, Shanghai, China.
Background: Local relapse has not been eradicated even in the era of total mesorectum excision. Although various approaches have been attempted, R0 resection remains the only potentially curative treatment. PATIENT AND METHODS: A 45-year-old woman with a history of laparoscopic abdominoperineal resection was diagnosed with pelvic recurrence 7 months ago.
View Article and Find Full Text PDFEJNMMI Rep
January 2025
Department of Diagnostics and Intervention, Diagnostic Radiology, Umeå University, Umeå, Sweden.
Background: In uterine cervical cancer (UCC), tumour staging is performed according to the 2018 International Federation of Gynecology and Obstetrics (FIGO) system, where imaging is incorporated, or the more generic Tumour Node Metastasis (TNM) classification. With the technical development in diagnostic imaging, continuous prospective evaluation of the different imaging methods contributing to stage determination is warranted. The aims of this interim study were to (1) evaluate the performance of radiological FIGO (rFIGO) and T staging (rT) with 2-fluorine-18-fluoro-deoxy-glucose (2[18F]-FDG)-positron emission tomography with computed tomography (PET/CT) and with magnetic resonance imaging (PET/MRI), compared to clinical FIGO (cFIGO) and T (cT) staging based on clinical examination and conventional imaging, in treatment-naïve UCC, and to (2) identify possible MRI biomarkers for early treatment response after radiotherapy.
View Article and Find Full Text PDFZhonghua Nei Ke Za Zhi
January 2025
Department of Infectious Diseases, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing100730, China.
A 65-year-old male was admitted to Peking Union Medical College Hospital. The patient had intermittent fever for 2 months with a maximum body temperature of 39.3 ℃ and elevated serum creatinine levels for 1 week.
View Article and Find Full Text PDFInt J Urol
January 2025
Department of Urology, Institute of Science Tokyo, Tokyo, Japan.
Prog Cardiovasc Dis
January 2025
Division of Cardiovascular Medicine, Department of Medicine, University of Virginia, Charlottesville, Virginia, USA. Electronic address:
Myocardial viability assessment is used to determine if chronically dysfunctional myocardium may benefit from coronary revascularization. Cardiac magnetic resonance with late gadolinium enhancement is the current gold standard for visualizing myocardial scar and provides valuable insight into myocardial viability. Viability assessments can also be made with Cardiac Positron Emission Tomography, Echocardiography, Single Photon Emission Tomography, and Cardiac Computed Tomography with each having advantages and disadvantages.
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