Frequencies of the immunohistochemically defined subtypes of breast cancers in 663 carcinoma cases informative for the tested markers using tissue microarrays
| Group | HER2 | ER | Cytokeratin 5/6 and/or HER1 | Frequency (%) |
|---|---|---|---|---|
| H (HER2) | Positive | Any | Any | 150 (23) |
| E (luminal) | Negative | Positive | Any | 263 (40) |
| B (basal-like) | Negative | Negative | One or both positive | 102 (15) |
| N (negative) | Negative | Negative | Negative | 148 (22) |