CD34 and small intestine neoplasm: While, most of the stomach GISTs were negative for ASMA (70.8%) and S-100 (64.3%) and positive for CD34 and CD117 (as well as most of small intestine tumors were positive for both), most of the large intestine GISTs were seen to be positive for ASMA (26.3%) and negative for CD34 (41.7%).