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XL281 is a novel anticancer compound designed to potently inhibit the RAS/RAF/MEK/ERK signaling pathway. Mutational activation of RAS occurs in about 30 percent of all human tumors, including non-small cell lung, pancreatic, and colon cancer. XL281 is a specific inhibitor of RAF kinases, including the mutant form of B-RAF, which is activated in 60 percent of melanomas, 24-44 percent of thyroid cancers, and 9 percent of colon cancers.