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Experimental Therapeutics, Preclinical Pharmacology |
1 Radioimmune & Inorganic Chemistry Section, Radiation Oncology Branch, and 2 Biometric Research Branch, National Cancer Institute, NIH, Bethesda Maryland
The studies reported herein demonstrate the efficacy of 
-particle–targeted radiation therapy of peritoneal disease with Herceptin as the targeting vehicle. Using the CHX-A-DTPA linker, Herceptin was radiolabeled with indium-111 and bismuth-213 with high efficiency without compromising immunoreactivity. A pilot radioimmunotherapy study treating mice bearing 5-day LS-174T (i.p.) xenografts, a low but uniform HER2 expressing, human colon carcinoma, with a single dose of 213Bi-CHX-A"-Herceptin, proved disappointing. This defined the effect of tumor burden/size on tumor response to radioimmunotherapy with -radiation. A more successful experiment with a lower tumor burden (3 days) in mice followed. A specific dose-response (P = 0.009) was observed, and although a maximum-tolerated dose was not determined, a dose of 500 to 750 µCi was selected as the operating dose for future experiments based on changes in animal weight. Median survival was increased from 20.5 days for the mock-treated mice to 43 and 59 days with 500 and 750 µCi, respectively. The therapeutic effectiveness of 213Bi-CHX-A"-Herceptin was also evaluated in a second animal model for peritoneal disease with a human pancreatic carcinoma (Shaw). The results of this study were not as dramatic as with the former model, and higher doses were required to obtain an increase in survival of the mice (P = 0.001).
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