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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Inhibition of tumor growth by recombinant vaccinia virus expressing GA733/CO17-1A/EpCAM/KSA/KS1-4 antigen in mice.

The human colorectal carcinoma (CRC)-associated GA733 antigen (Ag), also named CO17-1A/EpCAM/KSA/KS1-4, has been a useful target in passive immunotherapy of CRC patients with monoclonal antibody (mAb) and in active immunotherapy with anti-idiotypic antibodies or with recombinant protein. These approaches have targeted single epitopes (monoclonal anti-GA733 antibodies and anti-idiotypic antibodies) or extracellular domain epitopes (recombinant protein), primarily by B cells. To determine whether a reagent that induces immunity to a larger number of both B- and T-cell epitopes might represent a superior vaccine, we analyzed the capacity of full-length GA733 Ag expressing multiple potentially immunogenic epitopes and encoded by recombinant vaccinia virus (VV GA733-2) to induce humoral, cellular, and/or protective immunity in mice. VV GA733-2 induced Ag-specific antibodies that reacted predominantly to unknown epitopes on the Ag and lysed Ag-positive CRC targets in conjunction with murine peritoneal macrophages as effector cells. Immunized mice developed Ag-specific, proliferative and delayed-type hypersensitive lymphocytes. VV GA733-2 inhibited growth of ras-transformed syngeneic tumor cells expressing the human GA733 Ag in mice. These results suggest the potential of VV GA733-2 as a candidate vaccine for patients with CRC, possibly in combination with recombinant GA733-2-expressing adenovirus, which has been shown to induce cytolytic antibodies and T cells as well as tumor protective effects in mice. The combined vaccine approach may be superior to the use of either vaccine alone in patients who are pre-immune to both viruses.[1]


  1. Inhibition of tumor growth by recombinant vaccinia virus expressing GA733/CO17-1A/EpCAM/KSA/KS1-4 antigen in mice. Zaloudik, J., Li, W., Jacob, L., Kieny, M.P., Somasundaram, R., Acres, B., Song, H., Zhang, T., Li, J., Herlyn, D. Cancer Gene Ther. (2002) [Pubmed]
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