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Genomic sequencing identifies mutant 'drivers' of common brain tumor
Date:1/22/2013

BOSTONLarge-scale genomic sequencing has revealed two DNA mutations that appear to drive about 15 percent of brain tumors known as meningiomas, a finding that could lead to the first effective drug treatments for the tumors, report scientists from Dana-Farber Cancer Institute and the Broad Institute.

Surgery and radiation currently are the only treatments for meningiomas slow-growing, often benign tumors that develop in the membranes surrounding the brain. Meningiomas can grow dangerously large, however, causing seizures and limb weakness, and occasionally are fatal. In some instances, the tumors grow aggressively or their locations make surgery and radiation a challenge to carry out, and chemotherapy has proven ineffective as an alternative.

The researchers report in the journal Nature Genetics that they have identified two mutations, SMO and AKT1, in the genomes of 15 percent of a group of meningiomas removed during surgery. The findings are being published on the journal's web site in advance of appearing in a print edition.

"The wonderful thing about those mutations is that there are already drugs in the clinic to target cancers with those mutations," said Rameen Beroukhim, MD, PhD, a medical oncologist and cancer biologist at Dana-Farber and the Broad Institute.

"Clinically, there is no medical treatment for meningioma that is known to be effective," said Beroukhim, senior author of the paper along with William C. Hahn, MD, PhD, director of the Center for Cancer Genome Discovery at Dana-Farber, and Ian F. Dunn, MD, a neurosurgeon at Dana-Farber/Brigham and Women's Cancer Center (DF/BWCC).

Beroukhim said that surgery can effectively treat many meningiomas, but the locations of some tumors make surgery a difficult or impossible option. For other patients, there are not curative treatments, so the discovery of the mutations in some meningiomas "is potentially the first path to an effective medical treat
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Contact: Bill Schaller
william_schaller@dfci.harvard.edu
617-632-5357
Dana-Farber Cancer Institute
Source:Eurekalert  

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Genomic sequencing identifies mutant 'drivers' of common brain tumor
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