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• W3207198864 abstract "Abnormal CD38 expression in some hematologic malignancies, including lymphoma, has made it a biomarker for targeted therapies. Daratumumab (Dara) is the first FDA-approved CD38-specific monoclonal antibody, enabling successfully immunoPET imaging over the past years. Radiolabeled Dara however has a long blood circulation and delayed tumor uptake which can limit its applications. The focus of this study is to develop 64Cu-labeled Dara-F(ab′)2 for the visualization of CD38 in lymphoma models. F(ab′)2 fragment was prepared from Dara using an IdeS enzyme and purified with Protein A beads. Western blotting, flow cytometry, and surface plasmon resonance (SPR) were performed for in vitro assay. Probes were labeled with 64Cu after the chelation of 1,4,7-triazacyclononane-1,4,7-triacetic acid (NOTA). Small animal PET imaging and quantitative analysis were performed after injection of 64Cu-labeled Dara-F(ab′)2, IgG-F(ab′)2, and Dara for evaluation in lymphoma models. Flow cytometry and SPR assay proved the specific binding ability of Dara-F(ab′)2 and NOTA-Dara-F(ab′)2 in vitro. Radiolabeling yield of [64Cu]Cu-NOTA-Dara-F(ab′)2 was over 90% and with a specific activity of 4.0 ± 0.6 × 103 MBq/μmol (n = 5). PET imaging showed [64Cu]Cu-NOTA-Dara-F(ab′)2 had a rapid and high tumor uptake as early as 2 h (6.9 ± 1.2%ID/g) and peaked (9.5 ± 0.7%ID/g) at 12 h, whereas [64Cu]Cu-NOTA-Dara reached its tumor uptake peaked at 48 h (8.3 ± 1.4%ID/g, n = 4). In comparison, IgG-F(ab′)2 and HBL-1 control groups found no noticeable tumor uptake. [64Cu]Cu-NOTA-Dara-F(ab′)2 had significantly lower uptake in blood pool, bone, and muscle than [64Cu]Cu-NOTA-Dara and its tumor-to-blood and tumor-to-muscle ratios were significantly higher than controls. [64Cu]Cu-NOTA-Dara-F(ab′)2 showed a rapid and high tumor uptake in CD38-positive lymphoma models with favorable imaging contrast, showing its promise as a potential PET imaging agent for future clinical applications." @default.
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• W3207198864 date "2021-10-22" @default.
• W3207198864 modified "2023-10-15" @default.
• W3207198864 title "64Cu-labeled daratumumab F(ab′)2 fragment enables early visualization of CD38-positive lymphoma" @default.
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• W3207198864 doi "https://doi.org/10.1007/s00259-021-05593-9" @default.
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