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https://www.selleckchem.com/products/senaparib.html to predetermine the severity of COVID-19 pneumonia and make effective treatment plans in advance. FAPI ligands (fibroblast activation protein inhibitor), a novel class of radiotracers for PET/CT imaging, demonstrated in previous studies rapid and high tumor uptake. The purpose of this study is the head-to-head intra-individual comparison of Ga-FAPI versus standard-of-care F-FDG in PET/CT in organ biodistribution and tumor uptake in patients with various cancers. This international retrospective multicenter analysis included PET/CT data from 71 patients from 6 centers who underwent both Ga-FAPI and F-FDG PET/CT within a median time interval of 10days (range 1-89days). Volumes of interest (VOIs) were manually drawn in normal organs and tumor lesions to quantify tracer uptake by SUVmax and SUVmean. Furthermore, tumor-to-background ratios (TBR) were generated (SUVmax tumor/ SUVmax organ). A total of 71 patients were studied of, which 28 were female and 43 male (median age 60). In 41 of 71 patients, the primary tumor was present. Forty-three of 71 patients exhibited 162 metastatic lesions. Ga-FAPI uptake in primary tumors and metastases was comparable to F-FDG in most cases. The SUVmax was significantly lower for Ga-FAPI than F-FDG in background tissues such as the brain, oral mucosa, myocardium, blood pool, liver, pancreas, and colon. Thus, Ga-FAPI TBRs were significantly higher than F-FDG TBRs in some sites, including liver and bone metastases. Quantitative tumor uptake is comparable between Ga-FAPI and F-FDG, but lower background uptake in most normal organs results in equal or higher TBRs for Ga-FAPI. Thus, Ga-FAPI PET/CT may yield improved diagnostic information in various cancers and especially in tumor locations with high physiological F-FDG uptake. Quantitative tumor uptake is comparable between 68Ga-FAPI and 18F-FDG, but lower background uptake in most normal organs results in equal or higher TBRs for 68Ga-FAPI

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