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• W2259849752 abstract "The elevation of cancer antigen 125 (CA125) levels in the serum of asymptomatic patients precedes the radiologic detection of high-grade serous ovarian cancer by at least 2 mo and the final clinical diagnosis by 5 mo. PET imaging of CA125 expression by ovarian cancer cells may enhance the evaluation of the extent of disease and provide a roadmap to surgery as well as detect recurrence and metastases. <b>Methods:</b>⁸⁹Zr-labeled mAb-B43.13 was synthesized to target CA125 and evaluated via PET imaging and biodistribution studies in mice bearing OVCAR3 human ovarian adenocarcinoma xenografts. Ex vivo analysis of tumors and lymph nodes was performed via autoradiography, histopathology, and immunohistochemistry. <b>Results:</b> PET imaging using ⁸⁹Zr-DFO-mAb-B43.13 (DFO is desferrioxamine) clearly delineated CA125-positive OVCAR3 xenografts as early as 24 h after the administration of the radioimmunoconjugate. Biodistribution studies revealed accretion of ⁸⁹Zr-DFO-mAb-B43.13 in the OVCAR3 tumors, ultimately reaching 22.3 ± 6.3 percentage injected dose per gram (%ID/g) at 72 h after injection. Most interestingly, activity concentrations greater than 50 %ID/g were observed in the ipsilateral lymph nodes of the xenograft-bearing mice. Histopathologic analysis of the immuno-PET–positive lymph nodes revealed the presence of grossly metastasized ovarian cancer cells within the lymphoid tissues. In control experiments, only low-level, non-specific uptake of ⁸⁹Zr-labeled isotype IgG was observed in OVCAR3 tumors; similarly, low-activity concentrations of ⁸⁹Zr-DFO-mAb-B43.13 accumulated in CA125-negative SKOV3 tumors. <b>Conclusion:</b> Immuno-PET with ⁸⁹Zr-labeled mAb-B43.13 is a potential strategy for the noninvasive delineation of extent of disease and may add value in treatment planning and treatment monitoring of high-grade serous ovarian cancer." @default.
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• W2259849752 date "2016-02-02" @default.
• W2259849752 modified "2023-09-26" @default.
• W2259849752 title "Preclinical ⁸⁹Zr Immuno-PET of High-Grade Serous Ovarian Cancer and Lymph Node Metastasis" @default.
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• W2259849752 doi "https://doi.org/10.2967/jnumed.115.167072" @default.
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