Table 2

Frequencies of the immunohistochemically defined subtypes of breast cancers in 663 carcinoma cases informative for the tested markers using tissue microarrays

GroupHER2ERCytokeratin 5/6 and/or HER1Frequency (%)
H (HER2)PositiveAnyAny150 (23)
E (luminal)NegativePositiveAny263 (40)
B (basal-like)NegativeNegativeOne or both positive102 (15)
N (negative)NegativeNegativeNegative148 (22)