Indexed on: 01 Jul '85Published on: 01 Jul '85Published in: Journal of Cancer Research and Clinical Oncology
The anti-tumour activities of 1,2-diphenylethane oestrogens (hexoestrol and orthohexoestrol) and anti-oestrogens (metahexoestrol, tetramethylHES, and metatetramethylHES) were studied on the human MCF-7 and MDA-MB-231 breast cancer cell lines. On the E2R-positive MCF-7 cell line, all test compounds exhibited a dose-dependent inhibition of cell proliferation, but no correlation between anti-proliferative activity and binding affinity for the E2R was found. Tested on the E2R-negative MDA-MB-231 cell line, metahexoestrol also showed dose-dependent inhibitory effects, but higher concentrations were necessary than on the MCF-7 cell line. From this it is concluded that the anti-proliferative effect is specific and at least partially mediated via the E2R. Combination of metahexoestrol (10−6M) with E2 (10−9 to 10−7M) gave no rescue effect. It is therefore suggested that this compound might be useful for therapy in the presence of high oestrogen levels, i.e. in pre-menopausal patients. The test compounds (10−8 to 10−6M) could rescue the inhibitory effect of tamoxifen (10−6M) in a dose-dependent manner, except in the cases of metahexoestrol (10−6M) and tetramethylHES (10−6M). The latter compound exhibited a strongly additive effect at this concentration.