Investigation of Epstein-barr virus in Chinese colorectal tumors

Table 1 Results of immunohistochemistry

Group	n	EBV-positive	Positive rate (%)
Adenoma	26	1	3.8
Adenoma with dysplasia	23	1	4.3
Carcinomatous adenoma	22	2	9.1
Colorectal carcinoma	36	3	8.3
HNPCC	23	0	0
Total	130	7	5.4

χ² test, χ² = 0.0403 < χ²_0.05,4 = 9.49, P > 0.05.

Table 2 Results of PCR

Group	n	EBV-positive	Positive rate (%)
Adenoma	26	5	19.2
Adenomas with dysplasia	23	5	21.7
Carcinomatous adenoma	22	5	22.7
Colorectal carcinoma	36	7	19.4
HNPCC	23	4	17.4
Total	130	26	20.0

χ² test, χ² = 2.725 < χ²_0.05,4 = 9.49, P > 0.05.

Table 3 Results of EBER-ISH

Group	n	EBV-positive	Positive rate (%)
Adenoma	26	0	0
Adenomas with dysplasia	23	1	4.3
Carcinomatous adenoma	22	2	9.1
Colorectal carcinoma	36	3	8.3
HNPCC	23	0	0
Total	130	6	4.6

χ² test, χ² = 5.39, P > 0.05.