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Scientists design new drug type to kill lymphoma cells
Date:5/10/2010

Three researchers who are recipients of a collaborative grant from the Samuel Waxman Cancer Research Foundation have developed a new type of drug designed to kill non-Hodgkin lymphoma tumor cells. The breakthrough could lead to potential non-toxic therapies for cancer patients. The Foundation-funded investigators include Ari Melnick, M.D., of Weill Cornell Medical College, Alexander MacKerell, Ph.D., of the University of Maryland and Gilbert Priv, Ph.D., of the University of Toronto. The researchers, who published their findings in the April issue of Cancer Cell, have identified a drug that targets an oncogene known as BCL6.

BCL6 functions as a master regulatory protein. "It's a protein that controls the production of thousands of other genes," said Dr. Melnick, an associate professor of medicine at Weill Cornell Medical College in New York City. "Because of that, it has a very profound impact on cells and is required for lymphoma cells to survive and multiply."

BCL6 causes the majority of diffuse large B cell lymphomas, the most common form of non-Hodgkin lymphoma. Currently, about 60 percent of diffuse large B cell lymphomas can be cured with chemo-immunotherapy, said Dr. Melnick. "The hope is that we can improve that to a higher percent, and in the long term reduce the need for chemotherapy," he added.

Traditional cancer drugs target enzymes, which have small pockets on their surfaces that can be blocked with molecules. Until now, pharmaceutical companies have been reluctant to create drugs that target a protein like BCL6 because they function through a different mechanism involving interactions with cofactor proteins involving extensive protein surfaces. "And because the real estate covered by these interactions is so large, the drug companies have viewed these as being not druggable targets," said Dr. Melnick.

He and his colleagues were able to identify a "hot spot" on BLC6 that they predicted would play a critical rol
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Contact: Jenny Song
jsong@waxmancancer.org
212-348-0136
Samuel Waxman Cancer Research Foundation
Source:Eurekalert

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