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American Journal of Pathology, Vol 148, 313-319, Copyright © 1996 by American Society for Investigative Pathology
REGULAR ARTICLES |
PJ Dawson, SR Wolman, L Tait, GH Heppner and FR Miller
Department of Pathology, University of South Florida, Tampa, USA.
A human cell line (MCF10A) originated from spontaneous immortalization of breast epithelial cells obtained from a patient with fibrocystic disease. MCF10A cells do not survive in vivo in immunodeficient mice. However, T24 c-Ha-ras oncogene-transfected MCF10A cells (MCF10AT) form small nodules in nude/beige mice that persist for at least 1 year and sporadically progress to carcinomas. By reestablishing cells in tissue culture from one of the carcinomas, a cell line designated MCF10AT1 was derived that forms simple ducts when transplanted in Matrigel into immunodeficient mice. With time in vivo, the epithelium becomes proliferative and a cribriform pattern develops within the xenografts. A significant number progress to lesions resembling atypical hyperplasia and carcinoma in situ in women, and approximately 25% progress to invasive carcinomas with various types of differentiation including glandular, squamous, and undifferentiated. Cells have been established in culture from lesions representing successive transplant generations. With each generation, cells are somewhat more likely to progress to high risk lesions resembling human proliferative breast disease. Although the incidence of invasive carcinoma remained fairly constant at 20 to 25%, the frequency of nodules showing proliferative breast disease rose from 23% in the first transplant generation to 56% in the fourth transplant generation.
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