Hormone responsiveness of the transplanted tumors obtained from DMBA-induced mammary tumors
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The hormone responsiveness was lost by serial transplantation and metastasis occurred in rats with the hormone-independent tumor, and injection of estradiol and progesterone brought about a tumor regrowth after long period of dormant cells.Abstract:
In order to elucidate the characteristics of a hormonedependent mammary cancer, primary and serial transplantations of four mammary tumors induced by 7, 12-dimethylbenz (a) anthracene were carried out using inbred Fischer rats with different hormonal environments. Two primary tumors were successfully transplanted into the rats receiving estradiol or progesterone, showing strongly hormone responsiveness. The transplanted tumors regressed after withdrawing the hormone, and injection of estradiol and progesterone brought about a tumor regrowth after long period of dormant cells. The hormone responsiveness was lost by serial transplantation and metastasis occurred in rats with the hormone-independent tumor. The histologic appearance of the transplanted tumors was greatly altered by hormone, i.e., the tumor receiving estradiol showed plump epithelial cells with conspicuous vacuoles and large lumina of acini containing milk-like material, and the tumor receiving progesterone displayed fine acini composed of thin epithelial cells and the regressed tumor exhibited flattened epithelial cells, forming a single layer and outlining cystic spaces.read more
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Journal Article
Host Factors Affecting the Growth of Carcinogen-induced Rat Mammary Carcinomas: A Review and Tribute to Charles Brenton Huggins
TL;DR: The carcinogen-induced rat mammary carcinoma model is today the standard laboratory animal model in the study of human breast cancer and has a number of features that make it particularly attractive to the experimental oncologist, e.g., tumor induction ease and reliability.
Journal ArticleDOI
Endogenous Factors Influencing Host-Tumor Balance. Proceedings of an international symposium, Chicago, Oct. 1966. Robert W. Wissler, Thomas L. Dao, and Sumner Wood, Jr., Eds. University of Chicago Press, Chicago, 1967. xiv + 352 pp., illus. $12.50
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Effect of ovariectomy and androgen on the growth of mammary tumors induced by 7,12-dimethylbenz (α)-anthracene in rats
TL;DR: The effect of hormonal manipulation on the mammary tumor growth and on its histological changes were studied using DMBA-induced mammary tumors in rats using ovariectomy and administration of androgen.
References
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Journal ArticleDOI
Rapid induction of mammary carcinoma in the rat and the influence of hormones on the tumors
TL;DR: Hypophysectomy was the most effective method found to induce regression of mammary cancer in the present experiments.
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Mammary carcinogenesis by 3-methylcholanthrene. I. Hormonal aspects in tumor induction and growth.
Thomas L. Dao,Henry Sunderland +1 more
TL;DR: The failure to induce mammary cancer in males suggests that estrogens are important in mammary carcinogenesis induced by 3-methylcholanthrene, and increased progesterone stimulation seemed to be a factor in the rapid induction of tumors during pregnancy.
Journal Article
Morphology, natural history, and enzyme patterns in mammary tumors of the rat induced by 7,12-dimethylbenz(a)anthracene.
TL;DR: The natural history, morphology, and hormone responsiveness of 218 7,12-dimethylbenz(a)anthracene-induced breast tumors in the rat were observed and classified, and histologic patterns were distinguished which reflected the degree of differentiation.
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Spontaneous regression of induced mammary tumours in rats.
Stretton Young,Dorothea M. Cowan +1 more
Journal Article
Biochemical Characteristics of Mammary Glands and Mammary Tumors of Rats Induced by 3-Methylcholanthrene and 7,12-Dimethylbenz(a)anthracene
Russell Hilf,Harold Goldenberg,Inge Michel,Carrington Mj,Carlton Bell,Margot Gruenstein,D. R. Meranze,M. B. Shimkin +7 more
TL;DR: In this article, mammary carcinomas induced in rats by 3-methylcholanthrene (MCA) or 7,12-dimethylbenz(a)anthracene (DMBA) were also studied after ovariectomy of, or the administration of either estrogen or androgen to, the tumor-bearing animals.