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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 < χ²0.05,4 = 9.49, P > 0.05.
