Abstract | UNLABELLED: METHODS: RESULTS: (99m)Tc-hydrazinonicotinamide EGF-PEG-Qdot showed specific and high-affinity EGFR targeting on confocal microscopy, immunoblotting, and binding assays. When intravenously injected, MDA-MB-468 tumors were visualized with high contrast by both optical and scintigraphic imaging. Scintigraphic image-based quantification correctly discriminated high-EGFR-expressing MDA-MB-468 tumors from other tumors, and image-based tumor uptake closely correlated to EGFR content. Importantly, serial imaging of MDA-MB-468 tumors responding to cetuximab therapy could detect a significant reduction of tumor uptake that was paralleled by downregulation of EGFR expression. Furthermore, high baseline uptake predicted good response to cetuximab therapy. CONCLUSION: (99m)Tc-hydrazinonicotinamide EGF-PEG-Qdot provides EGFR-targeted imaging of breast tumors and may allow noninvasive monitoring of EGFR status in living subjects before and after targeted therapies.
|
Authors | Kyung-Ho Jung, Yearn Seong Choe, Jin-Young Paik, Kyung-Han Lee |
Journal | Journal of nuclear medicine : official publication, Society of Nuclear Medicine
(J Nucl Med)
Vol. 52
Issue 9
Pg. 1457-64
(Sep 2011)
ISSN: 1535-5667 [Electronic] United States |
PMID | 21849406
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
|
Chemical References |
- Antibodies, Monoclonal
- Antibodies, Monoclonal, Humanized
- Antineoplastic Agents
- Organotechnetium Compounds
- Radiopharmaceuticals
- Polyethylene Glycols
- Epidermal Growth Factor
- ErbB Receptors
- Cetuximab
|
Topics |
- Animals
- Antibodies, Monoclonal
(therapeutic use)
- Antibodies, Monoclonal, Humanized
- Antineoplastic Agents
(therapeutic use)
- Blotting, Western
- Breast Neoplasms
(diagnostic imaging, metabolism)
- Cell Line, Tumor
- Cetuximab
- Down-Regulation
(drug effects)
- Epidermal Growth Factor
(pharmacokinetics)
- ErbB Receptors
(drug effects, metabolism)
- Female
- Humans
- Mice
- Microscopy, Confocal
- Microscopy, Electron, Transmission
- Organotechnetium Compounds
(pharmacokinetics)
- Polyethylene Glycols
(pharmacokinetics)
- Quantum Dots
- Radionuclide Imaging
- Radiopharmaceuticals
(pharmacokinetics)
- Tissue Distribution
- Xenograft Model Antitumor Assays
|