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• W2989462877 abstract "Tracers can help visualize the lymphatic drainage patterns and sentinel nodes (SNs) of individual prostate cancer patients. To determine the role of nuclear medicine in surgical guidance, in particular the positional guidance of a SPECT/CT-based 3-dimensional imaging road map, in this process we studied to what extent fluorescence guidance underestimated the number of target lesions relative to radioguidance. <b>Methods:</b> SPECT/CT imaging was performed after intraprostatic tracer administration of either indocyanine green (ICG)-^99mTc-nanocolloid (hybrid-tracer group) or ^99mTc-nanocolloid to create a road map that depicted all SNs. Patients who received ^99mTc-nanocolloid were injected with “free” ICG immediately before surgery. Before unmasking, fluorescence guidance was used for intraoperative SN identification. This was followed by extended pelvic lymph node dissection (ePLND). After unmasking of the SPECT/CT images, the number of missed SNs was recorded and their resection was pursued when there was no risk of intraoperative complications. <b>Results:</b> Preoperative SPECT/CT revealed no differences in the SN identification rate between ICG-^99mTc-nanocolloid and ^99mTc-nanocolloid. However, fluorescence guidance allowed intraoperative removal of all SNs in only 40% of patients in the hybrid-tracer group and 20% of patients in the free-ICG group. Overall, 75.9% of the intraoperatively resected SNs in the hybrid-tracer group and 51.8% of the SNs in the free-ICG group were removed solely under fluorescence guidance. During ePLND, 22 additional SNs were resected (7 in the hybrid-tracer group and 15 in the free-ICG group). After unmasking, 18 remaining SNs were identified (6 in the hybrid group and 12 in the free-ICG group). In the free-ICG group, ex vivo evaluation of the excised specimens revealed that 14 SNs removed under ePLND or after unmasking contained radioactivity but no fluorescence. <b>Conclusion:</b> The preoperative imaging road map provided by SPECT/CT enhanced the detection of prostate SNs in more ectopic locations in 17 of the 25 patients, and the hybrid tracer ICG-^99mTc-nanocolloid was shown to outperform free ICG. Overall, fluorescence-guided pelvic nodal surgery underestimated the number of SNs in 60%–80% of patients." @default.
• W2989462877 created "2019-11-22" @default.
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• W2989462877 date "2019-11-11" @default.
• W2989462877 modified "2023-10-15" @default.
• W2989462877 title "Can Intraoperative Fluorescence Imaging Identify All Lesions While the Road Map Created by Preoperative Nuclear Imaging Is Masked?" @default.
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• W2989462877 doi "https://doi.org/10.2967/jnumed.119.235234" @default.
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