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Novel prostate cancer vaccine taking aim at cancer cell 'sweet spot'
Date:1/8/2009

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"A limitation with current immunotherapies is that every tumor expresses different protein antigens, which all need to be characterized," she explained. "It is difficult for the immune system to discriminate, to tell that cancer cells are 'non-self' and should be destroyed. What's nice about T-cells recognizing sugars and why it's so important in cancer is because the same molecules are uniquely expressed in a large variety of cancers." A cell that becomes cancerous begins making a variety of sugar molecules that are not expressed in normal adult cells, making this strategy potentially useful for wide-ranging treatments of different tumors. Her team is targeting a sugar that is expressed on all carcinomas, a type of cancer that begins in epithelial cells.

Studies in the first year of the grant are focusing on gathering further laboratory and preclinical data to show the vaccine's effectiveness. Franco is hoping to begin a clinical trial in the second year of the grant to test the vaccine on prostate cancer patients who have already had treatment but who are at extremely high risk for relapse. She sees the vaccine as being used to help prevent the spread of cancer (metastatic disease), and perhaps even in preventing cancer in healthy people.

"The beauty of this approach is that the same vaccine may prevent metastasis," she said, noting that tumor cells can use sugar or carbohydrate antigens to spread. "If ultimately proven successful, this could be used in a first attempt to try to address vaccination on a large scale to prevent cancer."

The same type of vaccine can potentially be used for breast, lung, liver, ovary and other carcinomas, Franco said. "If we can show that this system works in humans, we think that it can address a variety of tumors with the same sugar compounds." The vaccine's relatively simple formulation, stability and low production cost could make it ideal for use in developing countries, she added.


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Contact: Steve Benowitz
sbenowitz@ucsd.edu
619-543-6163
University of California - San Diego
Source:Eurekalert

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