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- W1998331397 abstract "Monoclonal antibody (MAb) CC49 reacts with tumor-associated glycoprotein (TAG)-72, a human pancarcinoma antigen. In clinical trials, radiolabeled CC49 has shown excellent tumor localization; however, many of the patients receiving MAb CC49 develop a human antimouse antibody response. In an attempt to prevent this antiimmunoglobulin response, we have developed a humanized CC49 (HuCC49) by grafting the MAb CC49 hypervariable regions onto the variable light (VL) and variable heavy (VH) frameworks of the human MAbs LEN and 21/28′ CL, respectively, while retaining those murine framework residues that may be required for the integrity of the antigen combining-site structure. The HuCC49 MAb was compared with native murine CC49 (nCC49) and chimeric CC49 (cCC49), using a variety of assays. SDS-PAGE analysis under nonreducing conditions showed that the HuCC49 MAb has virtually identical mobility to that of cCC49. Under reducing conditions, the HuCC49 yielded two bands of ~25–28 and ~50–55 kDa, characteristic of heavy and light immunoglobulin chains. In competition radioimmunoassays, HuCC49 completely inhibited the binding of 125I-labeled nCC49 to TAG-72, although 23- to 30-fold more HuCC49 was required to achieve a level of competition similar to those of cCC49 and nCC49. The relative affinity of HuCC49 was 2- to 3-fold less than those of the cCC49 and nCC49 MAbs, respectively. The plasma clearance in mice of HuCC49 was virtually identical to that of cCC49. Biodistribution studies demonstrated equivalent tumor-targeting of HuCC49 and cCC49 to human colon carcinoma xenografts. These studies thus suggest that HuCC49 and genetically modified molecules, such as sFv and domain-deleted immunoglobulins developed by using the HuCC49 variable region as a cassette, may be potentially useful in both diagnostic and therapeutic clinical trials in patients with TAG-72-positive tumors." @default.
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- W1998331397 date "1995-10-01" @default.
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- W1998331397 title "Generation, Characterization, and<i>in Vivo</i>Studies of Humanized Anticarcinoma Antibody CC49" @default.
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- W1998331397 doi "https://doi.org/10.1089/hyb.1995.14.461" @default.
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