Frequency of HER2/neu overexpression in adenocarcinoma of the gastrointestinal system

Table 3 HER2/neu status and morphological types

Morphological type grade of tumor	HER2/neu status
	Positive	Negative	Total
Grade-
I	11	5	16
II	18	8	26
III	4	4	8
Total1	33	17	50
Adenocarcinoma (NOS)	16	13	29
Mucinous adenocarcinoma	5	2	7
Adenocarcinoma (signet ring variant)	5	1	6
Adenocarcinoma (intestinal variant)	3	0	3
Papillary adenocarcinoma	2	0	2
Adenocarcinoma neuroendocrine differentiation	2	0	2
High grade neuroendocrine carcinoma	0	1	1
Total2	33	17	50

¹χ² = 22.906; P = 0.0000;

²χ² = 15.062; P = 0.0000.