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Malaria drug slows pancreatic cancer growth in mouse models
Date:3/15/2011

se models human pancreatic cancer cells placed under the rodents' skin (xenografts); human cells injected into the animals' pancreases (orthotopic transplants); and a genetic model (mice bioengineered to develop native pancreatic tumors).

The response to chloroquine was "profound" in the xenograft models, Kimmelman said: All eight untreated mice died of their cancer within 140 days, while only one of eight treated mice had died by 180 days.

The drug's effects were less dramatic but still impressive in the orthotopic and genetic mouse models, the researchers said. The tumors that developed in the genetically pancreatic cancer-prone mice were, like their equivalent in human patients, extremely resistant to all treatments. Among other properties, these tumors were embedded in tough, fibrous tissue that is difficult for drugs to penetrate.

Nevertheless, the scientists reported that chloroquine treatment as a single agent increased the rodents' survival by 27 days compared with untreated control mice. This is encouraging, Kimmelman commented, because even the newest targeted drugs aimed at pancreatic cancer "don't have much effect in this genetic mouse model."

The Dana-Farber trial of hydroxychloroquine, led by Kimmelman and oncologist Brian Wolpin, MD, is designed to enroll 36 pancreatic cancer patients in whom first- or second-line treatments have failed. The drug is taken in pill form twice a day. Results won't become available for at least a year, said Kimmelman.

Kimmelman said the next step will be to investigate the combination of hydroxychloroquine with radiation in patients with operable pancreatic cancer.

"This is a very interesting and promising approach, attacking the Achilles' heel in pancreatic cancer's defenses," commented Robert Mayer, MD, of Dana-Farber's Center for Gastrointestinal Oncology. "But it's too early to say whether hydroxychloroquine should be added to chemotherapy, and what the risks and
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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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