Sekiya S, Takamizawa H. The combined effect of nonsteroidal anti-oestrogens and sex steroids on the growth of rat uterine adenocarcinoma cells in tissue culture.
BRITISH JOURNAL OF OBSTETRICS AND GYNAECOLOGY 1976;
83:183-6. [PMID:
943174 DOI:
10.1111/j.1471-0528.1976.tb00806.x]
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Abstract
Nonsteroidal anti-oestrogenic drugs, tamoxifen and clomiphene citrate, at concentrations higher than 0.001 mug/ml reduced the colony forming ability of cells derived from a rat uterine adenocarcinoma in vitro. The 50 per cent inhibitory dose of these drugs was about one-hundredth of that of sex steroids. When the cells were treated with combinations of these nonsteroidal anti-oestrogenic drugs and the 50 per cent inhibitory dose (8 mug/ml) of progesterone, a synergistic effect on the inhibition of colony formation was observed. In contrast to progesterone, oestradiol-17beta (the 50 per cent inhibitory dose of which was about 16 mug/ml) suppressed additively the colony formation only in combination with low doses of anti-oestrogenic drugs.
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