Table 2. HER2 IHC results in paired endoscopic biopsy and resection specimens.

Resection specimens		Biopsy specimens
		Negative		Positive		Total	Concordance rate (%)
		0	1+	2+	3+
Negative	0	297	105	20	6	428	90.5
	1+	78	63	20	11	172
Positive	2+	11	10	12	13	46	71.6
	3+	3	5	10	38	56
	Total	389	183	62	68	702	87.7