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Journal Article
Research Support, Non-U.S. Gov't
The synthesis of E-17 alpha-[131I]iodo-vinyl oestradiol and evaluation of its use as a radiotracer for oestrogen receptor positive breast tumours.
Journal of Steroid Biochemistry 1990 May
17 alpha-Iodo-vinyl oestradiol binds with high affinity to the oestrogen receptor, is metabolically stable and has been shown to accumulate in oestrogen sensitive tissues of rodents. We have synthesised this compound and its 3-acetate, labelled with carrier free 125I and shown the accumulation of both compounds in rat uterus. 17 alpha-Iodo-vinyl oestradiol-3-acetate was prepared labelled with carrier free 131I and administered to twelve patients with suspected breast cancer, approximately 1 h before surgical removal of the primary tumour mass. At the time of surgery a sample of the tumour and a peripheral blood sample were taken. The ratio of radioactivity in the tumour to blood was determined. All tumours accumulated radioactivity and ratios ranged from 1.5:1 to 3.7:1. There was no correlation between the degree of accumulation and either cytosolic oestrogen or progesterone receptor concentration in the tumour. Analysis of blood revealed a single circulating species, 17 alpha-iodo-vinyl oestradiol. The results show that 17 alpha-iodo-vinyl oestradiol is metabolically stable and accumulates in breast tumours though this accumulation is not sufficient to permit imaging.
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