| 11. |
- Sandström, Karl, 1973-, et al.
(författare)
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Improved Tumor-to-Organ Ratios of a Novel 67Ga-Human Epidermal Growth Factor Radionuclide Conjugate with Preadministered Antiepidermal Growth Factor Receptor Affibody Molecules
- 2011
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Ingår i: Cancer Biotherapy and Radiopharmaceuticals. - : Mary Ann Liebert Inc. - 1084-9785 .- 1557-8852. ; 26:5, s. 593-601
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Tidskriftsartikel (refereegranskat)abstract
- The over-expression of the epidermal growth factor receptor (EGFR) in head and neck squamous cell carcinoma (HNSCC) is associated with poor prognosis. Targeted nuclear imaging of the EGFR expression could improve the diagnostics in patients with HNSCC. However, the high expression of EGFR in normal organs may conceal the tumor uptake and therefore limit the use.In this study, we have assessed the biodistribution of a novel hEGF radionuclide conjugate after pre-injection with anti-EGFR Affibody molecules. hEGF was conjugated with p-SCN-Bn-NOTA and labeled with 67Ga. The biodistribution of [67Ga]Ga-NOTA-Bn-NCS-hEGF in nude mice with EGFR-expressing xenografts was evaluated either alone or 45 minutes after pre-injection with one of the anti-EGFR Affibody molecules ZEGFR:1907, (ZEGFR:1907)2 or (ZEGFR:955)2.The novel radioimmunoconjugate, [67Ga]Ga-NOTA-Bn-NCS-hEGF demonstrated high stability in vitro and specific binding to hEGF in vitro and in vivo. Pre-injection with anti-EGFR Affibody molecules improved the tumor-to-organ ratio in the liver, salivary glands and colon. Overall, the dimeric high affinity Affibody molecule (ZEGFR:1907)2 exhibited the best results.These findings show that pre-blocking with an anti-EGFR Affibody molecule is a promising tool that could improve the outcome of radionuclide-based imaging of EGFR-expressing tumors.
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| 12. |
- Spiegelberg, Diana, et al.
(författare)
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A real-time in vitro assay as a potential predictor of in vivo tumor imaging properties
- 2016
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Ingår i: Nuclear Medicine and Biology. - : Elsevier BV. - 0969-8051 .- 1872-9614. ; 43:1, s. 12-18
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Tidskriftsartikel (refereegranskat)abstract
- Introduction: Selective tumor targeting strategies based on cell surface molecules enable new personalized diagnosis and treatments, potentially lowering adverse effects and increasing efficacy. Radio-immunotargeting generally relies on a molecule binding to a cancer-specific target. It is therefore important to understand the properties of molecular interactions in their working environment and how to translate these properties measured in vitro into the in vivo molecular imaging situation. Methods: Time resolved interaction analysis in vitro was compared with a corresponding in vivo xenograft mouse model. The antibody fragment AbD15179 was labeled with I-125 or In-111, and analyzed on cell lines with differing CD44v6 expression in vitro, and in a dual tumor xenograft model derived from the same cell lines. In vitro LigandTracer measurements were analyzed with TraceDrawer and Interaction Map. Conjugate sensitivity, kinetics, and signal-to-background ratios were assessed for both tumor cells in vitro and xenograft tumors in vivo. Results: In vitro results revealed a general biphasic appearance of a high- and a low-affinity interaction event. The In-111-labeled fragment displayed the largest proportion of the high-affinity interaction with increased sensitivity and retention compared to I-125-Fab. In vivo results were in agreement with in vitro data, with increased retention, higher sensitivity and better contrast for the In-111-labeled fragment compared to I-125. Conclusions: Time resolved binding characteristics measured in vitro largely matched the in vivo performance for the conjugates, which is promising for future studies. In vitro time-resolved LigandTracer assays are efficient, rapid, and in this study shown to be able to predict in vivo outcomes. Advances in Knowledge and Implications for Patient Care: Further studies are needed to confirm these findings, but the method is promising considering the ethical need to reduce the use of laboratory animals, as well as reducing costs for the development of tumor targeting compounds in the future.
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