Abstract
14-3-3σ is a tumor suppressor gene induced by p53 in response to DNA damage and reportedly associated with resistance to chemotherapy. The aim of this study was to investigate whether 14-3-3σ expression is also associated with resistance to neoadjuvant chemotherapy consisting of paclitaxel followed by 5-FU/epirubicin/cyclophosphamide (P-FEC) in human breast cancer patients. A total of 123 primary breast cancer patients treated with neoadjuvant chemotherapy (P-FEC) were included in this study. Immunohistochemistry of 14-3-3σ and p53 as well as direct sequencing of TP53 were performed using the tumor biopsy samples obtained prior to neoadjuvant chemotherapy. Thirty-eight of the tumors (31%) were positive for 14-3-3σ. There was no significant association between 14-3-3σ expression and TP53 mutation or p53 expression. However, 14-3-3σ expression showed a significantly (P = 0.009) negative association with pathological complete response (pCR) to P-FEC, and multivariate analysis demonstrated that only 14-3-3σ (P = 0.015) and estrogen receptor (P = 0.021) were significantly and independently associated with pCR. The combination of 14-3-3σ expression and TP53 mutation status had an additive negative effect on pCR, i.e., pCR rates were 45.5% for 14-3-3σ negative/TP53 mutant tumors, 24.6% for 14-3-3σ negative/TP53 wild tumors, 23.1% for 14-3-3σ positive/TP53 mutant tumors, and 0% for 14-3-3σ positive/TP53 wild tumors. These results demonstrate that 14-3-3σ expression is significantly associated with resistance to P-FEC and this association is independent of other biological markers. The combination of 14-3-3σ expression and TP53 mutation status has an additively negative effect on the response to P-FEC.
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Acknowledgments
This work was supported in part by a grant for the Comprehensive 10-Year Strategy for Cancer Control from the Ministry of Health, Labour and Welfare, Japan.
Conflict of interest
Research grants: S. Noguchi from Pfizer and Bristol-Myers Squibb., Honoraria: S. Noguchi from Pfizer and Bristol-Myers Squibb, S.J. Kim from Bristol-Myers, and T. Nakayama from Pfizer and Bristol-Myers.
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10549_2012_1976_MOESM2_ESM.jpg
Supplementary Fig. 1 . 14-3-3σ promoter hypermethylation and 14-3-3σ protein expression. Immunohistochemical staining results for six tumors with 14-3-3σ promoter hypermethylation. M, amplification with methylated primers; U, amplification with unmethylated primers. Scale bars: 200 μm. Marker: 200 bp DNA ladder marker. (JPG 147 kb)
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Nakamura, Y., Oshima, K., Naoi, Y. et al. 14-3-3σ expression is associated with poor pathological complete response to neoadjuvant chemotherapy in human breast cancers. Breast Cancer Res Treat 134, 229–236 (2012). https://doi.org/10.1007/s10549-012-1976-x
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DOI: https://doi.org/10.1007/s10549-012-1976-x