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Background  Enhancer of zest homolog 2 ( EZH2 ), a histone 3 methyltransferase, is associated with aggressive behavior of many tumors and is a promising target of molecular therapy.    Methods  To better elucidate the relevance of EZH2 in breast cancer subtypes, we evaluated EZH2 expression in 226 invasive breast carcinomas with four distinct immunophenotypes and in association with clinicopathological features.    Results  Of these cases, 138 (61.1 %) were defined as EZH2-overexpressing with a multiplicative score &gt; 3. EZH2 expression was inversely related to the status of ER and PR (Chi-square,  p  &lt; 0.001), and it was significantly associated with HER2 positivity, high proliferative index, and high histologic grade (Chi-square,  p  &lt; 0.05). ER-positive breast carcinoma with low proliferative index (Ki67 &lt; 14 %) showed the lowest expression and triple-negative breast carcinoma showed the highest overexpression of EZH2, 18.5 % (10/54) versus 90.9 % (50/55) (Chi-square,  p  &lt; 0.001). Intriguingly, 88 % (44/50) cases of grade 3 triple-negative breast carcinoma showed uniformly strong EZH2 expression with a multiplicative score of 9. The percentage of EZH2 overexpression in ER-positive breast carcinoma with a high proliferative index or HER2-positive cases were 61.2 and 74 %, respectively. Furthermore, EZH2 expression was significantly elevated in high-grade DCIS compared to benign lesions (90 % versus 0,  p  &lt; 0.001). However, there is no association between EZH2 expression and the status of histone 3 lysine 27 trimethylation or other clinicopathologic features.    Conclusion  In summary, triple-negative breast carcinoma showed the highest overexpression of EZH2. EZH2 overexpression is associated aggressive pathologic features including high nuclear grade, high proliferative index, and positivity of HER2 of breast carcinoma.

EZH2 overexpression in different immunophenotypes of breast carcinoma and association with clinicopathologic features