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UW research shows new prognosis tool for deadly brain cancer
Date:6/20/2012

Madison, Wis. A diagnosis of glioblastoma multiforme (GBM) is generally a death sentence, but new research from the University of Wisconsin-Madison lab of Dr. John Kuo shows that at least one subtype is associated with a longer life expectancy. This discovery could help with better patient prognoses and lead to targeted drug treatments for GBM subtypes.

People diagnosed with GBM live on average less than 15 months after diagnosis, even after undergoing aggressive surgery, radiation and chemotherapy. But not all GBM cancers are the same, and Kuo's study outlines a new method for sub-typing GBM tumor lines by the proteins they express.

The paper, published early online by the journal Clinical Cancer Research, shows that people who have a subtype of GBM that expresses a particular protein, known for short as CNP, may have a less aggressive subtype of cancer. The survival rate for those with the subtype is sometimes measured in years, not months.

The group isolated tumor lines from five human patients and grew them in the lab, and then looked for biomarkers specific to each line. They later transplanted the tissue into the brains of mice with compromised immune systems.

The researchers also looked for the CNP subtype in samples from 115 human patients and then looked at data on survival rates for those patients. They found that some patients with the protein lived much longer, as long as 10 years after diagnosis.

"We found that this protein was correlated with a less invasive type of cancer in mice, and when we looked at samples of human tumors, remarkably, we also found that the less invasive tumors expressed the CNP protein,'' says Kuo, assistant professor of neurological surgery and human oncology at UW School of Medicine and Public Health.

Kuo says the sub-typing could lead to more accurate prognosis for patients with a GBM diagnosis. Currently, most sub-typing of GBM tumors is based on mRNA, wh
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Contact: Susan Lampert Smith
ssmith5@uwhealth.org
608-262-7335
University of Wisconsin-Madison
Source:Eurekalert

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