Table 6.

Immunohistochemical findings of duodenal neuroendocrine tumor G1

	Immunoreactivity in the neuroendocrine tumor G1
bcl-2	0 / 6 (0%)
CD56	6 / 6 (100%)
Chromogranin A	6 / 6 (100%)
Estrogen receptor	0 / 6 (0%)
Pancreatic polypeptide	0 / 6 (0%)
Pan-cytokeratins	4 / 6 (66.7%)
Progesterone receptor	0 / 6 (0%)
p53	0 / 6 (0%)
Somatostatin	5 / 6 (83.3%)
Synaptophysin	6 / 6 (100%)
S-100	0 / 6 (0%)

Legend: Results of immunohistochemical examination of six cases of duodenal neuroendocrine tumor G1 are summarized.