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  • Title: Localization of GW-39 human tumors in hamsters by affinity-purified antibody to carcinoembryonic antigen.
    Author: Primus FJ, Macdonald R, Goldenberg DM, Hansen HJ.
    Journal: Cancer Res; 1977 May; 37(5):1544-7. PubMed ID: 851962.
    Abstract:
    With the paired-labeled antibody technique, the in vivo localization of radioiodinate, affinity-purified antibody to carcinoembryonic antigen (CEA) was studied in GW-39, a xenografted, CEA-producing tumor model. When compared to the whole immunoglobulin G fraction, a 4-fold greater tumor accumulation of radioantibody was obtained with affinity-purified specific CEA antibody. The degree of increased tumor localization of affinity-purified antibody was similar to its improved immunoreactivity as observed in radioimmunoassay and binding to CEA immunoadsorbent. Affinity-purified antibody cross-reactive with CEA and colon carcinoma antigen III was as equally effective in tumor localization as was specific CEA antibody prepared similarly. It thus appears that affinity-purified CEA radioantibody will provide a superior tumor-imaging agent for clinical use.
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