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• W2051204314 abstract "Abstract The majority of BRCA1-associated breast cancers are basal cell–like, which is associated with a poor outcome. Using a spontaneous mouse mammary tumor model, we show that platinum compounds, which generate DNA breaks during the repair process, are more effective than doxorubicin in Brca1/p53–mutated tumors. At 0.5 mg/kg of daily cisplatin treatment, 80% primary tumors (n = 8) show complete pathologic response. At greater dosages, 100% show complete response (n = 19). However, after 2 to 3 months of complete remission following platinum treatment, tumors relapse and become refractory to successive rounds of treatment. Approximately 3.8% to 8.0% (mean, 5.9%) of tumor cells express the normal mammary stem cell markers, CD29hi24med, and these cells are tumorigenic, whereas CD29med24−/lo and CD29med24hi cells have diminished tumorigenicity or are nontumorigenic, respectively. In partially platinum-responsive primary transplants, 6.6% to 11.0% (mean, 8.8%) tumor cells are CD29hi24med; these populations significantly increase to 16.5% to 29.2% (mean, 22.8%; P &lt; 0.05) in platinum-refractory secondary tumor transplants. Further, refractory tumor cells have greater colony-forming ability than the primary transplant–derived cells in the presence of cisplatin. Expression of a normal stem cell marker, Nanog, is decreased in the CD29hi24med populations in the secondary transplants. Top2A expression is also down-regulated in secondary drug-resistant tumor populations and, in one case, was accompanied by genomic deletion of Top2A. These studies identify distinct cancer cell populations for therapeutic targeting in breast cancer and implicate clonal evolution and expansion of cancer stem-like cells as a potential cause of chemoresistance. [Cancer Res 2008;68(9):3243–50]" @default.
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• W2051204314 date "2008-05-01" @default.
• W2051204314 modified "2023-10-01" @default.
• W2051204314 title "Cancer Stem Cells Contribute to Cisplatin Resistance in <i>Brca1/p53</i>–Mediated Mouse Mammary Tumors" @default.
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• W2051204314 doi "https://doi.org/10.1158/0008-5472.can-07-5480" @default.
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