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Calithera Biosciences Presents Data for CB-839 in Triple-Negative Breast Cancer Models at the 2013 San Antonio Breast Cancer Symposium
Date:12/12/2013

SOUTH SAN FRANCISCO, Calif., Dec. 12, 2013 /PRNewswire/ -- Calithera Biosciences, a biotechnology company focused on the development of novel cancer therapeutics, today announced the presentation of preclinical data for its lead anti-cancer therapeutic candidate, CB-839, at the 2013 San Antonio Breast Cancer Symposium.  CB-839 is a potent, selective, orally available glutaminase inhibitor that interferes with tumor metabolism and blocks cancer cell growth and survival. 

"Triple-negative breast cancer, which represents 10-20% of all breast cancers, can be aggressive and difficult to treat due to the fact that the current hormonal and HER-2 directed therapies do not work against these tumors.  Recent data indicate that triple-negative tumor growth is driven in part by high glutaminase expression and a reliance on the conversion of glutamine into glutamate to provide fuel for growth.  CB-839 demonstrates potent inhibition of glutaminase and significant anti-tumor activity in triple-negative breast cancer models, both as a single agent and in combination with the standard-of-care drug paclitaxel," said Susan Molineaux, Ph.D., President and Chief Executive Officer of Calithera Biosciences.  "This research also highlights the potential for use of biomarkers to identify patients whose breast cancer is most likely to respond to CB-839 treatment.  We look forward to advancing CB-839 into Phase 1 clinical studies in patients with advanced triple-negative breast cancer and other solid tumors early next year."

The anti-tumor activity of CB-839 was evaluated in a panel of breast tumor cell lines that included both triple-negative breast cancer and hormone receptor-positive subtypes.  Triple-negative breast cancers displayed higher sensitivity to CB-839 treatment, and this sensitivity was correlated with high glutaminase expression relative to tumor cells that were est
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