INSM1 and neuroendocrine neoplasm: INSM1 was slightly less sensitive (80.9%) for detection of gastroenteric neuroendocrine neoplasms than that of SYP (99.1%), CGA (88.6%), and CD56 (95.3%) while it was more specific (95.7% vs 86.0%, 87.3%, and 86.0%, respectively) [58].