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'Thin red line' around breast cancer
Date:5/2/2012

A pioneering approach to imaging breast cancer in mice has revealed new clues about why the human immune system often fails to attack tumors and keep cancer in check. This observation, by scientists at the University of California, San Francisco (UCSF), may help to reveal new approaches to cancer immunotherapy.

Published in the journal Cancer Cell last month, the work shows that the body's natural defenses trip over themselves on their way to attacking a tumor. The activated immune cells, alerted to the threat of the tumor, should make their way to the site of the cancer and then attack and shrink the tumor.

Instead, these immune cells are headed off at the pass. A completely separate set of healthy cells that are already in contact with the tumor effectively establish a defensive perimeter around it. There, like a thin red line between cancer and health, they head off the killer immune cells and keep them at bay outside the tumor.

"These cells are forming a last line of defense for the tumor against incoming cytotoxic cells," said Matthew Krummel, PhD, an associate professor of pathology and a principal investigator in the UCSF Helen Diller Family Comprehensive Cancer Center.

The discovery adds a rich layer of understanding of how the immune system interacts with breast cancer, knowledge that may ultimately help researchers find better ways to treat the disease, said Krummel. Future immunotherapy cancer treatments could be made more effective on their own or in combination with other drugs, he said, if researchers can find a way to enhance the ability of T cells to make it through this tumor defense.

Unlocking the Secrets of Cancer

Cracking open a crashed airplane's black box to parse its flight data and recreate its final few seconds is a powerful way of asking how improvements could be made to aviation safety. Biologists would like to do essentially the same thing with cancer: to liberate
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Contact: Jason Socrates Bardi
jason.bardi@ucsf.edu
415-502-6397
University of California - San Francisco
Source:Eurekalert  

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