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Distribution of human epidermal growth factor receptor 2 staining in 1195 colorectal adenocarcinomas
| Staining pattern | Number of cases | Positive rate |
| IHC 3+ | 31 | 2.6% |
| IHC 2+ | 105 | 8.8% |
| IHC 1+ | 475 | 39.7% |
| IHC 0 | 584 | 48.9% |
IHC: Immunohistochemical staining.
