© 1993 by Oxford University Press
Journal of the National Cancer Institute, Vol. 85, No. 21, 1725-1732,
November 3, 1993
© 1993 Oxford University Press
Xenograft Model of Progressive Human Proliferative Breast Disease
Breast Cancer Program, Meyer L. Prentis Comprehensive Cancer Center of Metropolitan Detroit; and Michigan Cancer Foundation Detroit
Breast Cancer Program, Meyer L. Prentis Comprehensive Cancer Center of Metropolitan Detroit; and Department of Pathology, Wayne State University Medical School Detroit
Department of Pathology and Laboratory Medicine, University of South Florida, Tampa, and James A. Haley V.A. Hospital Tampa
Breast Cancer Program, Meyer L. Prentis Comprehensive Cancer Center of Metropolitan Detroit; Michigan Cancer Foundation; and Department of Internal Medicine, Wayne State University Medical School
Correspondence to: Fred R. Miller. Ph.D., Breast Cancer Biology Program, Michigan Cancer Foundation, 110 E. Warren Ave., Detroit, MI 48201
BACKGROUND: Progression of proliferative breast disease has been associated with increased risk for development of invasive carcinoma. Cell lines have been developed to facilitate the study of this process. Human cell line MCF1OA originated from spontaneous immortalization of breast epithelial cells obtained from a patient with fibrocystic disease, and cell lines MCF1OAneoN and MCF1OAneoT were created by stable transfection of these cells with the neomycin-resistance gene and either the HRAS gene or the mutated T-24 HRAS gene, respectively.
PURPOSE: Our goal was to develop an experimental model of progressive human proliferative breast disease.
METHODS: MCF1OA, MCF1OAneoN, and MCF1OAneoT cells were injected subcutaneously into the dorsal flank of male nude/beige (C57/BALB/c nu/nu bg/ bg) mice (12 mice for each cell type). These mice were examined periodically for formation and persistence or growth of palpable nodules. One mouse per group was killed 1 week after cell injection; thereafter, mice were observed as long as possible. Cells were recovered from palpable lesions by enzymatic dissociation of the excised lesions. Cells re-established in tissue culture from a week-14 tumor (MCF1OAneoT.TG1) were injected into 12 male nude/beige mice. Southern blot hybridization analysis of the HRAS gene locus and cytogenetic analyses were performed.
RESULTS: Transplanted MCF1OA and MCF1OAneoN cells formed transient, small palpable nodules that regressed and disappeared during the 4th and 5th weeks. In 10 of the 12 mice, T-24 HRAS genetransfected MCF1OA cells (MCF1OAneoT) formed small, flat nodules that persisted for at least 1 year. Three of these xenografts became carcinomas. One (removed 7 weeks after transplantation) was an undifferentiated carcinoma composed of polygonal cells with large, vesicular nuclei and numerous mitoses. The second (removed after 14 weeks) was an invasive squamous cell carcinoma. The third (removed after 56 weeks) was a moderately differentiated adenocarcinoma. Initially, xenografts of MCF1OAneoT.TG1 cells showed intraductal proliferative changes; after 23 weeks, the lesions showed histologic features resembling those seen in atypical hyperplasia of the human breast, and later lesions showed characteristics of carcinoma in situ. The MCF1O lineage of cells of three MCF1OAneoT.TG1 xenografts was confirmed by DNA fmgerpnnting and karyotype analysis.
CONCLUSIONS: MCF1OAneoT and MCF1OAneoT.TG1 comprise a transplantable xenograft model that produces a broad spectrum of human proliferative breast disease.
IMPLICATIONS: The reproducible establishment of representative stages In early breast cancer progression from the MCF1O model offers a new opportunity to analyze critical events of carcinogenesis and progression in breast cancer. [J NatI Cancer Inst 85:1725–1732, 1993
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