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• W91358247 abstract "280 Objectives Gastrin-releasing Peptide Receptors (GRP-R) are expressed at high levels in prostate- and breast cancer, thereby providing attractive targets for GRP-R specific imaging and therapy. In the past, GRP-R agonists have been applied for good retention of radioactivity in tumor lesions. GRP-R agonists elicited side effects; however, GRP-R antagonists are expected to have no adverse effects. In our study we applied a novel 68Ga-labelled GRP-R antagonist, Sarabesin 3, and evaluated biodistribution, pharmacokinetics and tumor binding characteristics in patients with prostate and breast cancer. Methods [68Ga]Sarabesin 3 (283 ± 91 MBq, 45 ± 14 µg) was injected in 23 patients (8 with breast cancer, 9 with prostate cancer and 6 with other cancers) with disseminated disease and a history of previous therapies (e.g. anti-hormonal therapy). PET/CT fusion images were acquired 60-115 min post injection. Maximum standardized uptake values (SUVmax) were measured in different organs and in 66 tumor lesions. Pathological uptake of [68Ga]Sarabesin 3 was defined as focal accumulation besides physiological uptake. Results SUVmax mean values (and standard deviation) were: pancreas 43.8 ± 19.6, Kidneys 5.4 ± 1.2, blood pool 2.6 ± 0.7 and liver 1.8 ± 0.5. Tumor SUVmax mean values (and range) were 3.6 (0.7-17.8). Four (50%) out of 8 patients with breast cancer and 5 (55%) out of 9 patients with prostate cancer had pathological uptake on [68Ga]Sarabesin 3 scan. None of the tumors in 6 patients with other cancers could be visualized. No adverse effects of [68Ga]Sarabesin 3 were observed. Conclusions For the first time we present the biodistribution of [68Ga]Sarabesin 3 in patients with disseminated prostate and breast cancer. [68Ga]Sarabesin 3 can be helpful for diagnostic and possibly therapeutic applications in a selected group of patients with prostate or breast cancer." @default.
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• W91358247 date "2013-05-01" @default.
• W91358247 modified "2023-10-03" @default.
• W91358247 title "PET/CT imaging with a novel 68Ga-labelled GRP-receptor antagonist, Sarabesin 3. First clinical data in patients with prostate and breast cancer" @default.
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