PMID: 2142231Jun 22, 1990Paper

Review of the pharmacological properties of toremifene

Journal of Steroid Biochemistry
L Kangas


New compounds were synthesized with the aim to develop new anti-estrogenic antitumor drugs. The biological properties of the molecules were screened by (1) estrogen receptor (ER) binding, (2) effect on MCF-7 cells, (3) uterotrophic effect and inhibition of estradiol induced uterotropic effect and (4) antitumor effect in DMBA induced rat mammary cancer. One of the molecules, Fc-1157a = toremifene, exhibited the following characteristics: competitive inhibition of [3H]estradiol binding to ER (IC50 = 0.3 mumol/l), inhibition of MCF-7 cell growth in a concentration-dependent manner and cell-killing effect at higher than 3 mumol/l concentrations. Minimal estrogenic dose of toremifene on rat uterus weight was about 40 times higher than that of tamoxifen. Toremifene had statistically significant effect against DMBA-induced rat mammary cancer. Further screening consisted of antitumor, pharmacokinetic and safety studies. Toremifene inhibited the growth of ER-negative, glucocorticoid sensitive, mouse uterine sarcoma in a dose-dependent manner. Pharmacokinetics and metabolism of toremifene resembled closely those of tamoxifen, but since the chlorine atom of the toremifene molecule was not metabolically cleaved tamoxifen and toremifene did...Continue Reading


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Estrogen Antagonists
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