Diagnostic role of endoscopic ultrasonography in defining the clinical features and histopathological spectrum of gastroenteropancreatic neuroendocrine tumors

Table 3 Histopathological and immunohistochemical analysis

Variable	Frequency (No.)	Percentage (%)
Total	14	100.0
Histopathology types
Well differentiated tumor	11	78.6
Grade 1	4	28.6
Grade 2	6	42.9
Grade 3	1	7.1
Poorly differentiated tumor	3	21.4
Small cell	2	14.3
Large cell	1	7.1
Cytokeratin AE1/AE3
Positive	13	92.9
Ki-67
Positive	14	100.0
G1 (≤ 2%)	3	21.4
G2 (3%-20%)	8	57.2
G3 (> 20%)	3	21.4
Synaptophysin
Positive	14	100.0
Chromogranin A
Positive	5	35.7
Negative	1	7.1
Not done	8	57.2