METHOD AND COMPOSITION FOR THE TREATMENT OF CANCER BY THE ENZYMANTIC CONVERSION OF SOLUBLE RADIOACTIVE TOXIC PRECIPITATES IN THE CANCER
申请人:——
公开号:US20020022003A1
公开(公告)日:2002-02-21
A method for the treatment of cancer is disclosed which is capable of directing supra-lethal doses of radiation, called Hot-Spots, virtually exclusively to the cancer. The present invention involves a multi-step therapy process and includes a class of novel chemical agents. In accordance with the present invention, it was discovered that soluble precipitable materials can be made to accumulate as non-digestible precipitates in targeted cells as a result of enzyme action within the targeted cells. Accumulation is achieved by administering to the living host a soluble binary reagent made by attaching a targeting agent to a novel chemical agent which is a soluble precipitable material. The binary reagent binds to antigenic receptors on targeted cells which endocytose the binary reagent and transport it into the lysosomes where enzymes detach the soluble precipitable material from the targeting agent, causing it to precipitate, accumulate, and be retained in the cells. Increasing amounts of precipitate can be made to accumulate in cells by continuing the administration of the binary reagent. The accumulated precipitate is relocated to the extra-cellular fluid by selectively killing a fraction of cancer cells. Now relocated in the extra-cellular fluid of the cancer, the precipitate is used as a “platform” from which to generate Hot-Spots. A bispecific reagent with a non-mammalian enzyme moiety is made to bind to the precipitate. A soluble radioactive material is administered which is converted by the enzyme moiety of the bound bispecific reagent into a new form which is retained adjacent to the precipitate for an extended period of time, thereby generating Hot-Spots which non-selectively kill all cells adjacent to the precipitate in the extra-cellular fluid of the cancer.
本发明公开了一种治疗癌症的方法,该方法能够将超致命剂量的辐射(称为 "热点")几乎完全导向癌症。本发明涉及一个多步骤治疗过程,包括一类新型化学制剂。根据本发明,人们发现可溶性沉淀物可以在靶细胞内酶的作用下,以非消化沉淀物的形式在靶细胞内积聚。可溶性沉淀物的积累是通过向活体宿主施用一种可溶性二元试剂来实现的,该试剂是通过将一种靶向药剂与一种新型化学药剂(一种可溶性沉淀物)相连而制成的。二元试剂与靶细胞上的抗原受体结合,靶细胞内吞二元试剂并将其转运到溶酶体中,在溶酶体中酶将可溶性沉淀物与靶向剂分离,使其沉淀、积累并保留在细胞中。通过继续施用二元试剂,可使沉淀物在细胞中的积累量不断增加。通过选择性地杀死一部分癌细胞,可将积累的沉淀转移到细胞外液中。现在,沉淀转移到了癌细胞的细胞外液中,可用作生成热点的 "平台"。一种带有非哺乳动物酶分子的双特异性试剂与沉淀结合。施用一种可溶性放射性物质,这种物质会被结合的双特异性试剂的酶分子转化成一种新的形式,并在沉淀物附近保留较长时间,从而产生热斑,非选择性地杀死癌症细胞外液中沉淀物附近的所有细胞。