Biomarkers predictive for pathologic response to neoadjuvant docetaxel/cyclophosphamide chemotherapy in primary breast cancer.

Authors

null

Kazuhiro Shimada

Department of Breast and Thyroid Surgery, Yokohama City University Medical Center, Yokohama, Japan

Organizations

Department of Breast and Thyroid Surgery, Yokohama City University Medical Center, Yokohama, Japan

Research Funding

No funding sources reported

Background: Since docetaxel /cyclophosphamide chemotherapy (TC) has proven to be superior to anthracycline/cyclophosphamide (AC) in U.S. Oncology Research Trial 9735, TC has been widely used for treating patients with breast cancer. However, taxane-specific adverse events like neuralgia and edema can’t be ignored. Thus, we performed neoadjuvant study with TC to clarify biological markers of this regimen. Methods: 79 patients with invasive breast cancer received TC (docetaxel 75 mg/m2, cyclophosphamide 600 mg/m2, q3w for 4 courses) at the neoadjuvant setting and underwent surgical treatment. Before treatment, the clinic-pathological and immunohistochemical markers (ER, PgR, HER-2, Ki-67, p53, topoisomerase IIα, ClassIII β tubulin, CK5/6, EGFR) were examined with core-needle biopsy specimens. The correlation between the pathological response and expressions of markers was investigated. Results: 33 patients (41.8%) achieved quasi-pathological complete response (QpCR). Univeriate analysis revealed that ER (p < 0.001), PgR (p = 0.007), Ki-67 (p = 0.022) and classIII β tubulin (p = 0.032) were associated with QpCR. Only ER (p = 0.050) and classIII β tubulin (p = 0.028) remained with a statistical significance at multivariate analysis. Subgroup analysis revealed that the negativity of CK5/6 and/or EGFR was correlated with QpCR in the triple negative subtype. Conclusions: ClassIII β tubulin had a specific predictive value for pathological response of TC in addition of ER, PgR and Ki-67. Sub-grouping is important for treating triple-negative breast cancer.

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Abstract Details

Meeting

2013 Breast Cancer Symposium

Session Type

Poster Session

Session Title

General Poster Session A

Track

Local/Regional Therapy,Risk Assessment, Prevention, Detection, and Screening

Sub Track

High Risk

Citation

J Clin Oncol 31, 2013 (suppl 26; abstr 42)

DOI

10.1200/jco.2013.31.26_suppl.42

Abstract #

42

Poster Bd #

D2

Abstract Disclosures