Table 3.

Pathologic findings of 26 esophageal neuroendocrine tumors

Clinical characteristics	Number (%)
No. of patients	26 (100)
Tumor differentiation (2000 WHO classification)
Well differentiated	3 (11.5)
Mixed	2 (7.7)
Poorly differentiated	10 (38.5)
Not mentioned	11 (42.3)
Tumor differentiation (2010 WHO classification)
G1 (mitotic count <2, Ki-67 < 2)	None
G2 (mitotic count 2–20, Ki-67 3–20)	None
G3 (mitotic count >20, Ki-67 > 20)	7 (26.9)
Not mentioned	19 (73.0)
Tissue immunostaining
Synaptophysin	23 (88.5)
Chromogranin A	21 (80.8)
CD 56	8 (30.8)