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Cancer research brief: Targeting pancreatic cancer drug resistance
Date:7/8/2013

Cold Spring Harbor, NY Pancreatic cancer is one of the most deadly and intractable forms of cancer, with a 5-year survival rate of only 6%. Novel therapies are urgently needed, as conventional and targeted approaches have not been successful and drug resistance is an increasing problem.

Previously it had been thought that poor penetration of the drugs into pancreas tumors was the main reason for treatment failure. But now a team of scientists led by Cold Spring Harbor Laboratory (CSHL) Professor David Tuveson M.D., Ph.D., shows there are other factors at work, too.

In a paper published online today in the Proceedings of the National Academy of Sciences, Dr. Tuveson's group shows that there are survival cues inside the pancreatic tumor mass. Molecules in the milieu around the cancer cells, such as Connective Tissue Growth Factor (CTGF), provide "pro-life" signals that overcome the killing power of chemotherapeutic drugs.

"In addition to drug delivery being a problem, there is also this nurturing aspect that prevents cancer cells responding to the drugs," says Tuveson.

But he and his colleagues may have found a way to prevent this. The antibody FG-3019, a molecule that is now in phase 1/2 clinical investigation as a treatment option for pancreatic cancer, binds to CTGF and prevents it from providing cells with survival cues. Those cues seem to be mediated, at least in part, through a molecule within the cell called XIAP (X-linked inhibitor of apoptosis). XIAP derives its name from its function -- an ability to help keep the cell alive by preventing a process called apoptosis, a form of cellular suicide.

The Tuveson lab used a novel mouse model for pancreatic cancer to test FG-3019. Tumors in mice treated with FG-3019 in combination with the chemotherapeutic drug gemcitabine stopped growing. Inside the tumor there was an increase in the amount of cancer cells dying through apoptosis, which was associated with
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Contact: Edward Brydon
ebrydon@cshl.edu
516-367-6822
Cold Spring Harbor Laboratory
Source:Eurekalert

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