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Researchers find pathway that drives spread of pediatric bone cancer in preclinical studies
Date:10/25/2010

BOSTON - Researchers have identified an important signaling pathway that, when blocked, significantly decreases the spread of pediatric bone cancer.

In their study, researchers at The University of Texas MD Anderson Children's Cancer Hospital in Houston found that blocking the Notch pathway in mice decreased metastases in the lungs 15-fold. The results of a series of pre-clinical studies were reported Sunday in an oral presentation at the 42nd Congress of the International Society of Pediatric Oncology.

Their research showed that the Notch pathway and Hes1 gene play a key role in promoting the metastasis of osteosarcoma, the most common form of bone cancer in children.

Approximately 400 children and teens under the age of 20 are diagnosed with osteosarcoma annually, and the majority present with cancer that has already metastasized. The primary destination for the cancer to spread is to the lungs, which accounts for more than 35 percent of pediatric patients dying from osteosarcoma.

"Knowing the initial results from blocking Notch in mice, we are encouraged to keep investigating the entire metastasis process, so we can find additional therapies and targets to prevent cancer from spreading and growing," said Dennis Hughes, M.D., Ph.D., lead investigator and assistant professor at MD Anderson Children's Cancer Hospital.

In addition to Notch and Hes1's role in metastasis, Hughes believes that their expression can be correlated with a patient's prognosis. Hughes conducted a small retrospective study looking at patient samples, and 39 percent of patients with high expression levels of Hes1 survived 10 years versus the 60 percent survival rate for patients who had lower levels.

Ongoing research is studying the impact of various therapies, such as Gamma-secretase inhibitors and histone deacetylase (HDAC) inhibitors, that regulate the Notch pathway and have the potential to affect cancer cell survival. Hughe
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Contact: Sara Farris
sfarris@mdanderson.org
713-792-9133
University of Texas M. D. Anderson Cancer Center
Source:Eurekalert  

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