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Researchers create first molecule blocks key component of cancer genes' on-off switch
Date:9/24/2010

ed animal models in which the molecule could be tested against NMC tumors.

The animal studies were especially encouraging. Investigators transplanted NMC cells from patients into laboratory mice, which were then given the JQ1 molecule.

"The activity of the molecule was remarkable," says Bradner, who is also an associate member of the Chemical Biology Program at the Broad Institute of Harvard and MIT. "All the mice that received JQ1 lived; all that did not, died."

For now, JQ1's main utility is as a probe for better understanding the biology underlying NUT midline carcinoma. Bradner, Qi and their colleagues are tweaking the molecule to maximize its effectiveness as a BRD4-NUT stopper. Eventually, it, or a similar molecule, could be the basis for the first effective therapy against NMC.

"The disease tends to arise in the chest, head, or neck, along the vertical centerline of the body, with aggressive tumor growth and metastasis," Bradner explains. "Patients may have a brief response to chemotherapy, but they eventually succumb to the spread of the disease."

Unlike most cancers, NMC's tissue of origin isn't known. It is a disease defined entirely by its genetic signature the presence of the translocated gene BRD4-NUT. Prior to its genetic identification by Christopher French, MD, of Brigham and Women's Hospital and a study co-author, NMC wasn't recognized as a distinct disease.

"This research further illustrates the promise of personalized medicine," Bradner remarks, "which is the ability to deliver selected molecules to cancer-causing proteins to stop the cancer process while producing a minimum of residual side effects. The development of JQ1 or similar molecule into a drug may produce the first therapy specifically designed for patients with NMC."


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Contact: Teresa Herbert
teresa_herbert@dfci.harvard.edu
617-632-4090
Dana-Farber Cancer Institute
Source:Eurekalert

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