Abstract
Technetium-99m (Tc-99m) is an ideal radionuclide for clinical use. A murine monoclonal antibody (Mab) designated F33-104 binds to specific parts of carcinoembryonic antigen (CEA). In the present study, intact Mab F33-104 was labeled with Tc-99m, and the immunoreactivity and biodistribution of Tc-99m-labeled F33-104 were studied in athymic nude mice bearing human colorectal cancer xenografts. Mab F33-104, reduced under optimal conditions, was quickly and stably tagged with Tc-99m without loss of immunoreactivity. Higher tumor uptake of Tc-99m-labeled F33-104 was noted in the biodistribution, resulting in a higher localization index and specific-to-non-specific tumor ratio than those of radioiodinated F33-104. These results suggest the potential of Tc-99m-labeled Mab F33-104 for the radioimmunoimaging of colorectal cancer.
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Abbreviations
- CEA:
-
carcinoembryonic antigen
- Tc-99m:
-
technetium-99m
- I-125:
-
iodine-125
- Mab:
-
monoclonal antibody
- 2-ME:
-
2-mercaptoethanol
- HMDP:
-
hydroxyl methylene diphosphonate
- In-111:
-
indium-111
- PBS:
-
phosphate buffered saline
- hCG:
-
human chorionic gonadotropin
- RIA:
-
radioimmunoassay
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Watanabe, N., Oriuchi, N., Sugiyama, S. et al. Radioimmunoscintigraphy of colorectal cancer with technetium-99m-labeled murine anti-carcinoembryonic antigen monoclonal antibody in athymic nude mice. Ann Nucl Med 8, 23–30 (1994). https://doi.org/10.1007/BF03164983
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DOI: https://doi.org/10.1007/BF03164983