Influence of anti-oestrogens on the specific binding in vitro of (3H)oestradiol by cytosol of rat mammary tumours and human breast carcinomata.

The anti-oestrogenic potential of two nitrogen-mustard-containing compounds, I.C.I. 79792 and I.C.I. 85966, was studied. I.C.I. 85966 usually did not decrease specific binding of [3H]oestradiol by breast-tumour cytoplasmic proteins. I.C.I. 79792 decreased specific [3H]oestradiol binding, but not to the same extent as similar concentrations of I.C.I. 46474, diethylstilboestrol or dibutyldihydrostilboestrol.