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Breast Cancer Vaccines Look Promising
Date:6/26/2008

But research still to really pan out, expert warns

THURSDAY, June 26 (HealthDay News) -- Women with metastatic breast cancer who developed an immune response to an investigational vaccine lived twice as long as those who didn't have an immune response, new research shows.

"If you were an immune responder, you had double the survival of a non-responder," said study author Dr. Susan Domchek, an associate professor of medicine at the University of Pennsylvania.

Her report is one of several focusing on breast cancer vaccines expected to be discussed this week at the Department of Defense Era of Hope breast cancer research meeting, in Baltimore.

"Metastatic breast cancer is treatable but not curable," Domchek said. While the ultimate hope is to cure the cancer, breast cancer vaccines are one possible way to try to control the disease's spread.

Although most people think of vaccines as shots given to healthy people to prevent infectious diseases such as measles and the flu, various cancer vaccines that have been studied for decades use cancer cells, parts of cells or substances called antigens to trigger an immune response against cancer cells already in the body.

In her study, Domchek used pieces of a protein called human telomerase reverse transcriptase (hTERT) peptide to vaccinate 19 women with breast cancer that had spread. The peptide is nearly universally overexpressed in human cancers and is recognized by certain T-cells in the body's immune system.

At the start of the study, the women had no measurable T-cell response to hTERT. After up to eight vaccinations with the hTERT peptide, however, 13 of the 19 women made T-cells that reacted to the peptide.

"We biopsied the patients' breast cancer and saw that we could see these T-cells in the tumors themselves," she said. "And, in some cases, we could see evidence of tumor cells' death."

"Those who responded lived sign
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