<prompt> Best marker for GIST isCD117DOG 1CD 34CD 43  <response>: Diagnostic markers GISTs and cajal cells express c-KIT also known as CD117 and CD34. Most useful diagnostic marker is c-KIT and immunohistochemically detected in 95 of gastric GISTs GENERAL AND SYSTEMIC PATHOLOGY RAMDAS NAYAK FIRST EDITION PAGE 390 