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Immunohistochemistry study of the ERBB-2 oncogene revealed that all malignant tumors showed positive of the ERBB-2 expression. Most of the benign tumors were negative
| Malignant (%) | Extra-adrenal (%) | Benign (%) | P value | |
|---|---|---|---|---|
| +++ | 2 (29) | 1 (14) | 0 | |
| ++ | 4 (57) | 2 (29) | 7 (28) | |
| + | 1 (14) | 0 | 5 (20) | 0.0065 |
| − | 0 | 4 (57) | 13 (52) | |
| N | 7 | 7 | 25 |
