Fig. 6

Immunohistochemical findings in the component of adenocarcinoma. There were no immunopositive cells in the adenocarcinoma component. a Immunostaining for synaptophysin was negative. b Immunostaining for chromogranin A was negative. c Immunostaining for CD56 was negative. d Immunostaining for Ki-67 showed diffused positivity in 27% of the adenocarcinoma cells