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- W2168646085 abstract "A-ring substituted estrogens have been examined as growth inhibitors of the hormone dependent MXT murine mammary tumor. Certain of these estrogen analogues inhibited the growth of newly implanted as well as established MXT tumors when administered either by s.c. or i.p. injections or by intubation. These compounds were nontoxic over a broad range of active levels. Amino and nitro groups, introduced at position-4 of estrone 3-methyl ether were particularly carcinostatic, a property not shared by 4-bromoestrone 3-methyl ether. In addition tumor inhibition was greatly diminished by placing the nitro group at the other ortho position (i.e., carbon-2). Evidence indicates that the A-ring substituted estrogens may function as growth inhibitors via the estrogen receptor mechanism in the case of 4-nitro- and 4-aminoestrone. The 3-methyl ethers of these compounds also blocked tumor growth, possibly through in vivo dealkylation leading to the free phenolic A-ring substituted estrogens. On the other hand, A-ring substituted 3-deoxyestrogens (particularly 4-nitro- and 4-aminoestratrien-17 beta-ol), which do not bind to receptor, were also excellent inhibitors of hormone dependent MXT breast tumors and therefore must express their activity by mechanisms other than that mediated by receptor. The A-ring substituted estrogens are unlike tamoxifen and diethylstilbestrol which (a) display toxicity at optimum inhibitory doses and (b) are inactive or marginally active in rodent breast cancer models." @default.
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- W2168646085 date "1987-09-01" @default.
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- W2168646085 title "A-ring substituted estrogens as inhibitors of the MXT transplantable mammary ductal carcinoma." @default.
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