Abstract
Sexual-steroid-hormone-linked anticancer agents are a new group of cytotoxic drugs designed for a site-directed chemotherapy of tumors containing sexual steroid hormone receptors. The hormone (e.g. estradiol or testosterone) should act as a carrier that leads to a preferential receptor-mediated drug accumulation in hormone-receptor-positive tumors (such as mammary carcinomas and prostatic cancer). In several preclinical therapeutic studies of sexual-hormone-receptor-positive breast cancer, for instance, conjugates of 2-chloroethyl-carbamoyl-L-alanine linked to estradiol or dihydrotestosterone showed, in comparison to the unlinked single agent, a significantly higher antineoplastic activity and a clearly lower systemic toxicity. But there is still only limited knowledge about the pharmacokinetic properties and the mode of action of these new drugs. For this reason in the present article a more comprehensive pharmacokinetic model and the pattern of distribution of new sexual-steroid-hormone-linked anticancer agents have been described.
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