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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 < χ²0.05,4 = 9.49, P > 0.05.
