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1 Department of Experimental Oncology and Laboratories and 2 Department of Pathology, Istituto Nazionale Tumori; and 3 Cancer Genetic Unit, The Firc Institute of Molecular Oncology Foundation, Milan, Italy
Requests for reprints: Maria Grazia Daidone, Department of Experimental Oncology and Laboratories, Unit #10, Istituto Nazionale Tumori, Via Venezian, 1, Milan 20133, Italy. Phone: 39-02-2390-2238; E-mail: mariagrazia.daidone{at}istitutotumori.mi.it.
Breast cancerinitiating cells have been recently identified in breast carcinoma as CD44+/CD24/low cells, which exclusively retain tumorigenic activity and display stem celllike properties. However, at present, direct evidence that breast cancerinitiating cells can be propagated in vitro is still lacking. We report here the isolation and in vitro propagation of breast cancerinitiating cells from three breast cancer lesions and from an established breast carcinoma cell line. Our breast carcinomaderived cultures encompassed undifferentiated cells capable of self-renewal, extensive proliferation as clonal nonadherent spherical clusters, and differentiation along different mammary epithelial lineages (ductal and myoepithelial). Interestingly, cultured cells were CD44+/CD24 and Cx43, overexpressed neoangiogenic and cytoprotective factors, expressed the putative stem cell marker Oct-4, and gave rise to new tumors when as few as 103 cells were injected into the mammary fat pad of SCID mice. Long-term cultures of breast tumorigenic cells with stem/progenitor cell properties represent a suitable in vitro model to study breast cancerinitiating cells and to develop therapeutic strategies aimed at eradicating the tumorigenic subpopulation within breast cancer.
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J. A. Kruger, C. D. Kaplan, Y. Luo, H. Zhou, D. Markowitz, R. Xiang, and R. A. Reisfeld Characterization of stem cell-like cancer cells in immune-competent mice Blood, December 1, 2006; 108(12): 3906 - 3912. [Abstract] [Full Text] [PDF] |
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M. Narazaki and G. Tosato Tumor cell populations differ in angiogenic activity: a model system for spontaneous angiogenic switch can tell us why. J Natl Cancer Inst, March 1, 2006; 98(5): 294 - 295. [Full Text] [PDF] |
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