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TOP2A amplification in breast cancer is a predictive marker of anthracycline-based neoadjuvant chemotherapy efficacy

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Abstract

Anthracycline is a DNA topoisomerase 2-α (TOP2A) inhibitor and its concomitant over expression with Human Epidermal Growth Factor Receptor 2 (HER2) was investigated of being predictive for the response to anthracycline-based chemotherapies in breast cancer. 309 early and local advanced breast cancer patients were treated with anthracycline-based neoadjuvant chemotherapies in intense dose dense (IDD) (CE, Cyclophosphamide + Epirubicin) or conventional (TE, Paclitaxel + Epirubicin) regimens. HER2 proteins were qualitatively analyzed by immunohistochemistry (IHC) of primary tumor core biopsies, and TOP2A gene amplification levels of HER2 over-expressing cases were quantified by quantitative real-time polymerase chain reaction (qRT-PCR). Overall pathological complete response rate (pCR) was achieved in 14.3 %. HER2 was over expressed in 80/309 (25.9 %) cases, of which 61/80 cases have been tested for their TOP2A status. Over expression of HER2 was significantly positively correlated with higher pCR rates compared to low HER2 expression (27.5 % vs. 9.6 %, P < 0.001). Concurrent high TOP2A amplification led to a significantly higher pCR rate compared to low or no TOP2A amplification (56.3 % vs. 13.8 %, P = 0.001). HER2 over expression was associated with a significantly higher pCR rate only when TOP2A was also amplified (56.3 % vs. 9.6 %, P < 0.001), but not when it was deleted or normal (13.8 % vs. 9.6 %, P = 0.183) compared to HER2 low-expressing tumors. The interaction between HER2 or TOP2A and anthracycline-based regimen was observed in IDD and conventional neoadjuvant chemotherapies. The TOP2A amplification is related to anthracycline-based neoadjuvant chemotherapy sensitivity, and TOP2A should be included in future studies in breast cancer as a predictive marker.

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Acknowledgments

We thank the patients who participated in this study and their families. We are grateful to the doctors in the Department of Pathology for their technical assistance. National Natural Science Foundation of China (30972934); National Natural Science Foundation of China (81000991).

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The authors declare that there are no conflicts of interest.

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Correspondence to Binghe Xu.

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Wang, J., Xu, B., Yuan, P. et al. TOP2A amplification in breast cancer is a predictive marker of anthracycline-based neoadjuvant chemotherapy efficacy. Breast Cancer Res Treat 135, 531–537 (2012). https://doi.org/10.1007/s10549-012-2167-5

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  • DOI: https://doi.org/10.1007/s10549-012-2167-5

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