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Laboratory detective work points to potential therapy for rare, drug-resistant cancer
Date:2/12/2014

PITTSBURGH, Feb. 13, 2014 University of Pittsburgh Cancer Institute (UPCI) scientists have shown that old drugs might be able to do new tricks.

By screening a library of FDA-approved anticancer drugs that previously wouldn't have been considered as a treatment for a rare type of cancer, UPCI scientists were surprised when they found several potential possibilities to try if the cancer becomes resistant to standard drug treatment.

The discovery, which will be published in the February 15th issue of Cancer Research, demonstrates that high-throughput screening of already FDA-approved drugs can identify new therapies that could be rapidly moved to the clinic.

"This is known as 'drug repurposing,' and it is an increasingly promising way to speed up the development of treatments for cancers that do not respond well to standard therapies," said senior author Anette Duensing, M.D., assistant professor of pathology at UPCI. "Drug repurposing builds upon previous research and development efforts, and detailed information about the drug formulation and safety is usually available, meaning that it can be ready for clinical trials much faster than a brand-new drug."

Dr. Duensing and her team ran the screening on 89 drugs previously approved by the FDA in an attempt to find more treatment options for patients with gastrointestinal stromal tumors (GISTs), which are uncommon tumors that begin in the walls of the gastrointestinal tract. According to the American Cancer Society, about 5,000 cases of GISTs occur each year in the United States with an estimated five-year survival rate of 45 percent in patients with advanced disease.

GISTs are caused by a single gene mutation and can be successfully treated with the targeted therapy drug imatinib, known by the trade name Gleevec. However, about half of the patients treated with Gleevec become resistant to the drug within the first two years of treatment.

After studying how samples of GIST
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Contact: Allison Hydzik
hydzikam@upmc.edu
412-647-9975
University of Pittsburgh Schools of the Health Sciences
Source:Eurekalert  

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