Exelixis Reports Encouraging Phase 1 Data for XL1...(macodynamic studiesin mice oral administ...),Health

Date:6/1/2008

macodynamic studies in mice, oral administration of XL184 resulted in balanced and durable inhibition of these targets. The compound has also shown activity against common mutant forms of RET and MET. XL184 has exhibited dose-dependent tumor growth inhibition and tumor regression in a variety of tumor models, including breast cancer, colon cancer, MTC, non-small cell lung cancer, and glioblastoma. A pivotal phase 3 trial of XL184 in patients with MTC is planned to begin in the summer of 2008. Phase 1/2 and 2 studies of XL184 in non-small cell lung cancer and glioblastoma multiforme are ongoing.

About Medullary Thyroid Cancer

The American Cancer Society estimates that MTC accounts for 5% of all thyroid cancers. MTC occurs in sporadic and inherited forms (approximately 80% and 20% of MTC, respectively), and is frequently associated with genetic activation of RET. The inherited form usually appears at a younger age, while dietary iodine deficiency and radiation exposure are risk factors for the sporadic form. MTC may metastasize to lymph nodes or other organs before it is ever diagnosed. Additionally, MTC does not take up radioactive iodine, which is commonly used to treat other types of thyroid cancers and to diagnose metastases. As a result, MTC is more difficult to treat than other thyroid cancers. There are no approved therapies for MTC; however, common treatments for MTC include surgery to remove malignant tissue, radiation therapy, and chemotherapy, all of which are associated with potential side effects, some of which may be long-term.

About Exelixis

Exelixis, Inc. is a development-stage biotechnology company dedicated to the discovery and development of novel small molecule therapeutics for the treatment of cancer and other serious diseases. The company is leveraging its fully integrated drug discovery platform to fuel the growth of its development pipeline, which is primarily focused on cancer. Currently, Exelixis' broad product pip
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SOURCE Exelixis, Inc. Copyright©2008 PR Newswire. All rights reserved

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