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Mayo Clinic researchers building melanoma vaccine to combat skin cancer
Date:3/19/2012

ROCHESTER, Minn. -- Mayo Clinic researchers have trained mouse immune systems to eradicate skin cancer from within, using a genetic combination of human DNA from melanoma cells and a cousin of the rabies virus. The strategy, called cancer immunotherapy, uses a genetically engineered version of the vesicular stomatitis virus to deliver a broad spectrum of genes derived from melanoma cancer cells directly into tumors. In early studies, 60 percent of tumor-burdened mice were cured in fewer than three months and with minimal side effects. Results of the latest study appear this week in the journal Nature Biotechnology.

"We believe that this new technique will help us to identify a whole new set of genes that encode antigens that are important in stimulating the immune system to reject cancer. In particular, we have seen that several proteins need to be expressed together to generate the most effective rejection of the tumors in mice," says Richard Vile, Ph.D., a Mayo Clinic researcher in the Department of Molecular Medicine and a coauthor of the study, along with Jose Pulido, M.D., a Mayo Clinic ophthalmologist and ocular oncologist.

Dr. Vile's success with melanoma adds to Mayo Clinic's growing portfolio of experimental cancer vaccines, which includes an active clinical trial of vesicular stomatitis vaccines for liver cancers. Future studies could include similar vaccines for more aggressive cancers, such as lung, brain and pancreatic.

"I do believe we can create vaccines that will knock them off one by one," Dr. Vile says. "By vaccinating against multiple proteins at once, we hope that we will be able to treat both the primary tumor and also protect against recurrence."

The immune system functions on a seek-and-destroy platform and has fine-tuned its capacity to identify viral invaders such as vesicular stomatitis virus. Part of the appeal of building cancer vaccines from the whole spectrum of tumor DNA is that tumors c
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Contact: Robert Nellis
newsbureau@mayo.edu
507-284-5005
Mayo Clinic
Source:Eurekalert

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