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Antibody extends life of mice with breast cancer

A monoclonal antibody developed by researchers at the University at Buffalo has been shown to extend significantly the survival of mice with human breast-cancer tumors and to inhibit the cancer's spread to the lungs in the animals by more than 50 percent.

The antibody, named JAA-F11, targets a particular disaccharide, an antigen known as TF-Ag, which aids the adhesion and spread of certain cancer cells. While the antibody did not kill the cancer cells, it blocked stages of cancer-cell growth that allow the cells to adhere to organ tissue, the research showed.

Results of the research appeared in the November 2006 issue of the journal Neoplasia.

Mice with breast-cancer tumors that received the antibody had a median survival time of 72 days, compared to 57 days for the animals that did not receive JAA-F11, the study found. In addition, exposing cultures of tumor cells to the antibody inhibited cell growth by a statistically significant 16 percent.

Kate Rittenhouse-Olson, Ph.D., associate professor of clinical and laboratory sciences in the UB School of Medicine and Biomedical Sciences, is senior author on the study.

"This antibody binds with a carbohydrate on the tumor cell surface that is involved in adhesion of the cell during the metastatic process," said Rittenhouse-Olson. "Not only would drugs attached to the antibody JAA-F11 bind to the tumor cell surface to direct their cytotoxic effect, but the binding of the antibody itself would block the cell from metastasizing."

The antibody was tested using in vitro models of tumor cell growth, in assays to determine its ability to damage or kill cells (cytotoxicity), in various models of cancer metastasis, and, finally, in mice with metastatic breast cancer.

"In addition to providing a survival advantage," said Rittenhouse-Olson, "JAA-F11 immunotherapy reduced the metastatic tumor burden significantly, reflected by both a dramatic decline in the overall
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Source:University at Buffalo


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