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Gene Therapy Eradicates Pancreatic Cancer in Mice

Researchers at the University of Texas M. D. Anderson Cancer Center have found in pre-clinical trials that a molecularly engineered therapy selectively embeds a gene in pancreatic cancer that shrinks or eradicates tumours, inhibits metastasis, and prolongs survival virtually without toxicity.

"This vehicle, or vector, is so targeted and robust in its cancer-specific expression that it can be used for therapy and perhaps for imaging," notes senior author Dr. Mien-Chie Hung, Professor and Chair of Department of Molecular and Cellular Oncology at the institution.

In a report published in the journal Cancer Cell, the researchers have described the system as a versatile expression vector-nicknamed VISA. It includes a targeting agent that is also called a promoter, two components that boost gene expression in the target tissue, and a payload that is a gene known to kill cancer cells in this case.

All these are packaged in a fatty ball called liposome, and delivered through veins.

"This looks like a promising approach to gene therapy for pancreatic cancer and we are working to bring it to a clinical trial," says Dr. James Abbruzzese, Professor and Chair of the M. D. Anderson Department of Gastrointestinal Oncology.

It may take around one to two years to complete U.S. Food and Drug Administration requirements for a Phase I trial, he says.

In a study, the researchers loaded the VISA system with a mutant version of a gene named BiK, which expresses a protein that naturally forces cancer cells to kill themselves, in two different types of mice. Boffins created the more lethal mutant and named it BikDD.

Untreated control mice in both experiments all died within 40 days, while mice treated with the mutant gene delivered via a less-targeted viral promoter driven expression system employing cytomegalovirus (CMV) died within 90 days. However, the VISA-BikDD mice lived longer in b
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