Purpose: The purpose of this study was to assess the use of 1-(11)C-acetate (ACE) as a metabolic tracer for the detection and characterisation of astrocytomas.
Methods: Positron emission tomography (PET) studies with ACE and 2-(18)F-fluoro-2-deoxy-D-glucose (FDG) were performed sequentially in 26 patients with primary astrocytomas. Images were analysed by visual interpretation and determination of the tumour to cortex ratio (T/C ratio) and standardised uptake value (SUV). The tumour uptake was visually scored into three grades as compared with the contralateral cortex: clearly lower (-), almost equal (+) and clearly higher (++).
Results: There were 85% of astrocytomas with ++ ACE uptake, 15% with + ACE uptake and none with - ACE uptake. Only 19% of astrocytomas had ++ FDG uptake. Thirty-seven percent of high-grade astrocytomas had + FDG uptake and 37% had - FDG uptake. The sensitivity and specificity of the FDG T/C ratio in discriminating high-grade from low-grade astrocytomas were 79% and 100%, respectively, at the cutoff value of 0.75. Using 2.33 as the cutoff value of the ACE T/C ratio, the sensitivity and specificity were 42% and 86%, respectively. FDG was better than ACE in discriminating high-grade from low-grade astrocytomas. T/C ratios and SUVs of FDG uptake of tumours correlated with the histological grades, but those of ACE uptake did not.
Conclusion: ACE appears to be a promising tracer for use in the detection of primary astrocytomas, but is of limited value in the differentiation of high- and low-grade astrocytomas. ACE is complementary to FDG for the diagnosis and characterisation of astrocytoma.
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http://dx.doi.org/10.1007/s00259-005-0023-0 | DOI Listing |
Aliment Pharmacol Ther
January 2025
School of Cancer Sciences, College of Medical Veterinary and Life Sciences, University of Glasgow, Wolfson Wohl Cancer Research Centre, Garscube Estate, Glasgow, UK.
Background: Adherence to post-polypectomy surveillance is poor despite evidence that it is associated with lower risk of future colorectal cancer.
Methods: We evaluated 6,210 bowel screening participants between 2009-2016 in NHS Greater Glasgow and Clyde to assess potential barriers to post-polypectomy surveillance.
Results: Increasing deprivation (Scottish Index of Multiple Deprivation quintile 1 vs 5; OR 1.
BMJ Open
January 2025
School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham, UK
Introduction: Individuals with higher neurological levels of spinal cord injury (SCI) at or above the sixth thoracic segment (≥T6), exhibit impaired resting cardiovascular control and responses during upper-body exercise. Over time, impaired cardiovascular control predisposes individuals to lower cardiorespiratory fitness and thus a greater risk for cardiovascular disease and mortality. Non-invasive transcutaneous spinal cord stimulation (TSCS) has been shown to modulate cardiovascular responses at rest in individuals with SCI, yet its effectiveness to enhance exercise performance acutely, or promote superior physiological adaptations to exercise following an intervention, in an adequately powered cohort is unknown.
View Article and Find Full Text PDFJ Drug Target
January 2025
Department of Pharmaceutics, Sinhgad College of Pharmacy, Vadgaon (Bk.), Pune-411041, Maharashtra, India.
Ferulic acid (FA) is a phenolic compound obtained naturally and is a versatile antioxidant identified for its potential in managing hypertension. However, its application is constrained due to its classification as a BCS Class IV moiety. To address this, we concentrated on improving its solubility and permeability by developing nanostructured lipid carriers (NLCs) of FA using emulsification probe sonication technique.
View Article and Find Full Text PDFInt J Sports Med
January 2025
Institute for Integrated Sports Medicine, Keio University School of Medicine, Tokyo, Japan.
Hypoxic training enhances endurance sports tolerance. However, individual responses vary due to physiological differences. This study investigated the relationship between genetic factors and exercise tolerance in hypoxic conditions.
View Article and Find Full Text PDFGenes (Basel)
November 2024
Swiss Federal Institute of Sport Magglingen SFISM, 2532 Magglingen, Switzerland.
Background: This study examines genetic variations in the systemic oxygen transport cascade during exhaustive exercise in physically trained tactical athletes. Research goal: To update the information on the distribution of influence of eleven polymorphisms in ten genes, namely ACE (rs1799752), AGT (rs699), MCT1 (rs1049434), HIF1A (rs11549465), COMT (rs4680), CKM (rs8111989), TNC (rs2104772), PTK2 (rs7460 and rs7843014), ACTN3 (rs1815739), and MSTN (rs1805086)-on the connected steps of oxygen transport during aerobic muscle work.
Methods: 251 young, healthy tactical athletes (including 12 females) with a systematic physical training history underwent exercise tests, including standardized endurance running with a 12.
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