SYP and neoplasm: In the present study, representative antibodies against the following were then used via immunohistochemically evaluating the tumor cells: bcl-2 (1 : 50 dilution; Dako Japan, Tokyo, Japan, Clone name: 124), chromogranin A (1 : 800 dilution; Dako Japan, Clone name: DAK-A3), Ki-67 (1 : 200 dilution; Dako Japan, Clone name: MIB-1), and synaptophysin (1 : 40 dilution; Dako Japan, Clone name: M0776).