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79 Percent of Patients Achieved Partial Response; 21 Percent Had Stable Disease with Targeted Therapy PLX3397

BERKELEY, Calif., May 14, 2014 (BUSINESS WIRE) -- Plexxikon, a member of the Daiichi Sankyo Group, announced today promising, proof-of-concept Phase 1 extension clinical data with PLX3397 in pigmented villonodular synovitis (PVNS), a type of rare, often locally aggressive, musculoskeletal neoplasm that arises from the soft tissues of joints and tendons. Interim data from this ongoing trial show that all evaluable patients treated with PLX3397 achieved either partial responses or stable disease. PLX3397 is a novel, oral small molecule that potently and selectively inhibits CSF1R, KIT and oncogenic FLT3 kinases, which play important roles in cancer. CSF1R, in particular, has been shown to be a primary driver in PVNS. These data are being released today as part of the American Society of Clinical Oncology (ASCO) 50th Annual Meeting Press Program. More detailed data will be presented at the ASCO 50th Annual Meeting, being held May 31-June 3 in Chicago.