KIT and gastrointestinal stromal tumor: Given a broader knowledge of the mutational status and expression levels of c-Kit in IM-sensitive and resistant GIST patients, targeting c-Kit plus HER1 (IM or amuvatinib plus erlotinib or afatinib) or c-Kit plus c-Met/AXL (IM plus amuvatinib) with novel combinations of RTK inhibitors abrogates IM resistance in GIST.