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¹ Arizona Cancer Center, ² Department of Biochemistry and Molecular Biophysics, University of Arizona, and ³ Center for Toxicology: Microbiology and Immunology, University of Arizona, Arizona Health Sciences Center, Tucson, Arizona

Requests for reprints: Robert J. Gillies, Arizona Cancer Center, University of Arizona, P.O. Box 245024, Tucson, AZ 85724. Phone: 520-626-5050; Fax: 520-626-5051.

Apoptosis has long been considered to be the prevailing mechanism of cell death in response to chemotherapy. Currently, a more heterogeneous model of tumor response to therapy is acknowledged wherein multiple modes of death combine to generate the overall tumor response. The resulting mechanisms of cell death are likely determined by the mechanism of action of the drug, the dosing regimen used, and the genetic background of the cells within the tumor. This study describes a nonapoptotic response to docetaxel therapy in human breast cancer cells of increasing cancer progression (MCF-10A, MCF-7, and MDA-mb-231). Docetaxel is a microtubule-stabilizing taxane that is being used in the clinic for the treatment of breast and prostate cancers and small cell carcinoma of the lung. The genetic backgrounds of these cells were characterized for the status of key pathways and gene products involved in drug response and cell death. Cellular responses to docetaxel were assessed by characterizing cell viability, cell cycle checkpoint arrest, and mechanisms of cell death. Mechanisms of cell death were determined by Annexin V binding and scoring of cytology-stained cells by morphology and transmission electron microscopy. The primary mechanism of death was determined to be mitotic catastrophe by scoring of micronucleated cells and cells undergoing aberrant mitosis. Other, nonapoptotic modes of death were also determined. No significant changes in levels of apoptosis were observed in response to docetaxel.

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Note: Portions of this work have been published in a dissertation at the University of Arizona (D.L. Morse).

Received 4/27/05; revised 6/28/05; accepted 7/27/05.