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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Modification of the effect of a gonadoliberin analog on 7,12-dimethylbenz(a)anthracene-induced rat mammary tumors by hormone replacement.

A gonadoliberin analog, (D-leucyl6, desglycyl-NH2(10), prolyl ethylamide9) gonadoliberin, is known to suppress ovarian function and plasma prolactin levels. Its antitumor activity was evaluated against mammary tumors induced in Sprague-Dawley rats by dimethylbenz(a)anthracene. Observations were made when the analog, referred to as A-43818, was given alone and together with estrogen replacement or perphenazine, A-43818, 10 microgram s.c. twice a day for 6 weeks, was highly effective in producing tumor remissions. All of the 11 animals survived throughout the observation period, complete regressions occurred in 8 of 13 tumors, and 2 were classified as static. None of the 16 tumors in 12 control rats regressed, and there were 4 deaths. When estradiol benzoate, 2 microgram s.c. each day, was administered with the A-43818, antitumor activity was suppressed; only 2 of 17 tumors regressed, 6 were static, and 5 of the 10 rats in this group died. Perphenazine, 1 mg i.m. daily, a dose known to cause hyperprolactinemia, also impaired the efficacy of A-43818. Three of 14 tumors regressed, 6 were static, and the rest continued to grow; 3 of the 12 rats died within 6 weeks of starting treatment.[1]


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