Abstract
Purpose
We examined the possible efficacy of the yttrium-90 (90Y)-labeled anti-CDH3/P-cadherin mouse monoclonal antibody (MAb-6) in radioimmunotherapy (RIT) for lung and colorectal cancers that express CDH3/P-cadherin.
Experimental design
MAb-6 was established using genetic immunization. The biodistribution of MAb-6 in nude mice with lung and colorectal cancers was examined by administering indium-111(111In)-labeled MAb-6 to mice. The mice were prepared by inoculation of CDH3/P-cadherin-positive (EBC1, H1373, and SW948) and CDH3/P-cadherin-negative (A549 and RKO) tumor cells. Therapeutic effects and toxicity were investigated by administration of 90Y-labeled MAb-6 (90Y-MAb-6) to EBC, H1373, and SW948-inoculated mice.
Results
Our in vivo results confirmed the specific binding of MAb-6 to tumor cells after intravenous injections of 111In-labeled MAb-6 to mice with tumors expressing CDH3/P-cadherin. A single intravenous injection of 90Y-MAb-6 (100 μCi) significantly suppressed tumor growth in mice with tumors expressing CDH3/P-cadherin. Furthermore, two injections of 90Y-MAb-6 led to complete tumor regression in H1373-inoculated mice without any detectable toxicity.
Conclusions
Our findings demonstrate that CDH3/P-cadherin-targeting RIT with 90Y-MAb-6 is a promising strategy for the treatment for cancers expressing CDH3/P-cadherin.




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Acknowledgments
We would like to thank Dr. Megumi Takayanagi for contributions to this project. This study was funded by Oncotherapy Science Inc.
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The authors declare that they have no conflicts of interest.
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Yoshioka, H., Yamamoto, S., Hanaoka, H. et al. In vivo therapeutic effect of CDH3/P-cadherin-targeting radioimmunotherapy. Cancer Immunol Immunother 61, 1211–1220 (2012). https://doi.org/10.1007/s00262-011-1186-0
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DOI: https://doi.org/10.1007/s00262-011-1186-0