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Clinical evaluation of chemotherapy response predictors developed from breast cancer cell lines

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Abstract

The goal of this study was to develop pharmacogenomic predictors in response to standard chemotherapy drugs in breast cancer cell lines and test their predictive value in patients who received treatment with the same drugs. Nineteen human breast cancer cell lines were tested for sensitivity to paclitaxel (T), 5-fluorouracil (F), doxorubicin (A) and cyclophosphamide (C) in vitro. Baseline gene expression data were obtained for each cell line with Affymetrix U133A gene chips, and multigene predictors of sensitivity were derived for each drug separately. These predictors were applied individually and in combination to human gene expression data generated with the same Affymetrix platform from fine needle aspiration specimens of 133 stage I-III breast cancers. Tumor samples were obtained at baseline, and each patient received 6 months of preoperative TFAC chemotherapy followed by surgery. Cell line-derived prediction results were correlated with the observed pathologic response to chemotherapy. Statistically robust differentially expressed genes between sensitive and resistant cells could only be found for paclitaxel. False discovery rates associated with the informative genes were high for all other drugs. For each drug, the top 100 differentially expressed genes were combined into a drug-specific response predictor. When these cell line-based predictors were applied to patient data, there was no significant correlation between observed response and predicted response either for individual drug predictors or combined predictions. Cell line-derived predictors of response to four commonly used chemotherapy drugs did not predict response accurately in patients.

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Acknowledgments

Five of the cell lines are generous courtesy from Mien-Chie Hung, Ph.D., Professor and Chairman of the Department of Molecular & Cellular Oncology at The University of Texas MD Anderson Cancer Center. Another five cell lines are generous courtesy from Naoto T Ueno, M.D., Ph.D., Associate Professor of the Department of Breast Medical Oncology at The University of Texas MD Anderson Cancer Center. Furthermore, 4-Hydroperoxycyclophosphamide was generously provided by Borje S. Andersson, M.D., Ph.D., Professor of the Department of Stem Cell Transplantation at The University of Texas MD Anderson Cancer Center.

Funding support

Supported by grants to CL from the Deutsche Forschungsgemeinschaft (dfg), to L.P. from the NCI (RO1-CA106290), the Breast Cancer Research Foundation and the Goodwin Foundation and to G.N.H. by the NCI (2P30 CA016672 28(PP-4)) and the Nellie B. Connally Breast Cancer Research Fund. T.A. is a visiting professor of the Hungarian American Enterprise Scholarship Fund (HAESF).

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Correspondence to Lajos Pusztai.

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The authors Cornelia Liedtke and Jing Wang contributed equally to this work and should be considered joint first authors.

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Liedtke, C., Wang, J., Tordai, A. et al. Clinical evaluation of chemotherapy response predictors developed from breast cancer cell lines. Breast Cancer Res Treat 121, 301–309 (2010). https://doi.org/10.1007/s10549-009-0445-7

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