( IRVING Texas--(BUSINESS WIRE)--May 15...)RTA 402 Shown to Inhibit STAT3 in Animal Model and Holds,Significant Promise for Treating Breast Cancer,Health

IRVING, Texas--(BUSINESS WIRE)--May 15, 2007 - Reata Pharmaceuticals, Inc. today announced the publication of an article in the May 2007 issue of the journal Cancer Research showing that RTA 402, the company's Phase 2 development candidate for cancer, was highly effective in a rigorous animal model of breast cancer and that the drug inhibits signaling activity of STAT3, an important target for new cancer therapies.

The article, "The Novel Triterpenoid C-28 Methyl Ester of 2-Cyano-3, 12-Dioxooleen-1, 9-Dien-28-Oic Acid Inhibits Metastatic Murine Breast Tumor Growth through Inactivation of STAT3 Signaling," was authored by Reata scientific collaborators from the University of Texas M. D. Anderson Cancer Center.

The authors conducted two studies of RTA 402 in the highly rigorous 4T1 mouse model of breast cancer. Few other agents have shown any effect in this animal model, in which tumors grow very rapidly and become widely distributed, or metastasized, throughout the body. In two separate experiments, treatment with RTA 402 was found to have a profound effect in suppressing the growth and spread of these tumors. In a model mimicking the spread of metastatic disease, RTA 402 completely blocked the development of metastases in all animals, whereas untreated animals developed widespread disease. In a second model mimicking the treatment of established breast tumors, RTA 402 provided a 95% reduction in the total tumor burden of treated animals compared with the untreated control group.

Additionally, the authors showed that this activity was occurring in part through inactivation of STAT3 signaling. STAT3 - short for signal transducer and activator of transcription 3 - is increasingly recognized as an important target for cancer therapies. Activated STAT3 is frequently found in patients with breast cancer and other types of tumors. This protein is known to turn on a number of genes associated with cancer
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