CD47 and pancreatic neuroendocrine tumor: Several studies suggest that expression of CD47 is a prognostic marker in many different types of cancers, such as leukemia [4], lymphoma [54], hepatocellular carcinoma [55], bladder cancer [56], NSCLC [5], leiomyosarcoma [57], colorectal cancer [58], and pancreatic neuroendocrine tumors [59].