PMID: 8443758Mar 15, 1993Paper

Clinical evaluation of tumor targeting with a high-affinity, anticarcinoembryonic-antigen-specific, murine monoclonal antibody, MN-14

Cancer
R M SharkeyD O Izon

Abstract

The authors previously reported that an anticarcinoembryonic antigen antibody against a carcinoembryonic antigen (CEA)-specific epitope is preferred for clinical investigations. They developed a second generation, CEA-specific murine monoclonal antibody (MoAb), MN-14 (IMMU-14), that has a tenfold higher affinity. This report summarizes the initial clinical experience with the new MoAb. MN-14 immunoglobulin G (IgG) (0.5-6.0 mg) was labeled with radioactive iodine (I131) (5-80 mCi) and injected into 22 patients with cancer. External scintigraphy was used to determine targeting in patients with low and highly elevated plasma CEA. Quantitative external scintigraphy methods were used to determine organ and tumor clearance rates and absorbed radiation doses. Targeting data were correlated with several factors, including MoAb protein dose, plasma CEA, and relative tumor burden. Despite more than 80% complexation with plasma CEA of more than 500 ng/ml, all known tumor sites were disclosed by external scintigraphy. The overall sensitivity of tumor targeting on a lesion basis was 89%. The residence time in the blood was predicted by body weight (P = 0.05) and the log of plasma CEA (P = 0.043). The absorbed dose to the red marrow and tota...Continue Reading

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