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CK5/6, EGFR, Ki-67, cyclin D1, and nm23-H1 protein expressions as predictors of pathological complete response to neoadjuvant chemotherapy in triple-negative breast cancer patients

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Abstract

The purpose of this study was to evaluate the importance of biological markers to predict pathologic complete response (pCR) to neoadjuvant chemotherapy (NCT) in patients with locally advanced triple-negative breast cancers (TNBCs). Forty-one patients (18.6%) among 220 breast cancer patients were identified as TNBCs from March 2006 to 2009 were included in this prospective study. The pre-NCT treatment expression levels of Ki-67 proliferation index, estrogen receptor (ER), progesterone receptor (PgR), epidermal growth factor receptor 2 (HER-2), CK5/6, epidermal growth factor receptor (EGFR), cyclin D1, and nm23-H1 were detected by immunohistochemistry (IHC). A total of 180 cycles were administered with the median number of four cycles per patient (range, 4–6). The pCR rate was 34.1% (95% CI, 19.6–48.6%). In univariate analysis, early T stage, clinical response after 2 cycles, negative basal-like, negative EGFR, high Ki-67 proliferation index, and positive nm23-H1 were found to be significantly predictive of a pCR (P = 0.010, 0.040, 0.007, 0.001, 0.019, and 0.010, respectively). Basal-like status and nm23-H1 status were significant for pCR on multivariate analysis (P = 0.004 and 0.031, respectively). Basal-like status and nm23-H1 are independent predictive factors of pCR to neoadjuvant docetaxel plus epirubicin combination chemotherapy in patients with TNBCs.

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Acknowledgments

This study is supported in part by Chinese Army Medical Research Fund (06MA245).

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The authors have no commercial, proprietary, or financial interest in the products or companies described in this article.

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Correspondence to Xi-ru Li.

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Xi-ru Li and Mei Liu authors contributed equally to this article.

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Li, Xr., Liu, M., Zhang, Yj. et al. CK5/6, EGFR, Ki-67, cyclin D1, and nm23-H1 protein expressions as predictors of pathological complete response to neoadjuvant chemotherapy in triple-negative breast cancer patients. Med Oncol 28 (Suppl 1), 129–134 (2011). https://doi.org/10.1007/s12032-010-9742-6

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  • DOI: https://doi.org/10.1007/s12032-010-9742-6

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