Antibody directed enzyme prodrug therapy (edept) with...

A - Human Necessities – 61 – K

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A61K 47/48 (2006.01)

Patent

CA 2344440

A method for increasing the target-specific toxicity of a drug is effected by pretargeting an enzyme to a mammalian target site, and then administering a cytotoxic drug known to act at the target site, or a prodrug form thereof which is converted to the drug in situ, which drug is also detoxified to form an intermediate of lower toxicity using said mammal's ordinary metabolic processes, whereby the detoxified intermediate is reconverted to its more toxic form by the pretargeted enzyme and thus has enhanced cytotoxicity at the target site. Further enhancement can be achieved by pretargeting an enzyme which converts the prodrug to the cytotoxic drug at the target site. Kits for use with the method also are provided. The method and kits permit lower doses of cytotoxic agents, maximize target site activity and minimize systemic side effects.

L'invention concerne un procédé permettant d'augmenter la toxicité spécifique cible d'un médicament, qui consiste à précibler une enzyme vers un site cible de mammifère, puis à administrer un médicament cytotoxique connu pour agir sur le site cible, ou une forme de promédicament de celui-ci qui est converti en médicament in situ, lequel médicament est également détoxiqué pour former un intermédiaire de toxicité inférieure à l'aide des processus métaboliques ordinaires du mammifère, l'intermédiaire détoxiqué étant reconverti à sa forme plus toxique par l'enzyme préciblée et ayant renforcé ainsi la cytotoxicité au site cible. On peut encore obtenir un renforcement en préciblant une enzyme qui convertit le promédicament en médicament cytotoxique au site cible. L'invention porte également sur des trousses utilisées avec ce procédé. Le procédé et les trousses, qui permettent de réduire les doses d'agents cytotoxiques, optimisent l'activité du site cible et réduisent les effets systémiques secondaires.

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