HSP90 Inhibitor To Advance To Clinical Development - Prominent In Tumor Cells Where It Promotes Activity Of Proteins Controlling Growth And Survival

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Exelixis, Inc. (Nasdaq:EXEL) announced today that it has submitted an investigational new drug (IND) application to the U.S. Food and Drug Administration for XL888, a novel anticancer compound. XL888 is an orally available small molecule inhibitor of HSP90, which is a chaperone protein that promotes the activity and stability of a range of key regulatory proteins, including kinases.