( CAMBRIDGE Mass.--(BUSINESS WIRE)--May ...)Xanthus Presents Novel Approach for Autoimmune Disease Reversal,with Symadex,Health

CAMBRIDGE, Mass.--(BUSINESS WIRE)--May 3, 2007 - Xanthus Pharmaceuticals, Inc today presented data demonstrating that Symadex(TM) reversed the clinical and pathological signs of chronic disease in an animal model for multiple sclerosis. The presentation was made by Stephen J. Karlik, Ph.D., Professor of Diagnostic Radiology at the University of Western Ontario, London, Ontario, together with researchers from Xanthus in a poster session at the 59th American Academy of Neurology Meeting in Boston, MA.

Using a model of experimental autoimmune encephalomyelitis (EAE) that is designed to represent multiple sclerosis, Dr. Karlik tested Symadex for its effect on both acute and chronic disease. In the acute EAE model, animals treated with Symadex substantially recovered while in control animals the disease symptoms and damage remained unchanged. In chronic EAE disease models, clinical and pathological disease reversal and tissue recovery were observed with Symadex treatment. At the same time, Symadex did not affect circulating immune cell numbers, suggesting that it does not act as a general immunosuppressant.

"Symadex' ability to reverse chronic autoimmune disease in this animal model is notable. The study results suggest this activity may result from inhibiting macrophage function rather than inhibiting T cell function. This mechanism is novel in my experience," said Dr. Karlik.

"We now have a significant body of promising preclinical data supporting the use of Symadex in multiple autoimmune indications. We believe this represents a strong partnering opportunity for our Company, and we are preparing to initiate a human proof-of-principle trial with Symadex in autoimmune disease," stated Richard T. Dean, Ph.D., Xanthus' Chief Executive Officer.

About Symadex(TM)

Symadex (formerly C-1311) is the lead compound from a new series of agents, the imidazoacridinones, which have been shown to be po
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