A DDS preparation of a platinum complex, which selectively releases a highly active platinum complex in cells that are under reducing conditions, and exhibits high antitumor activity that is required from a medicine, is still not available, and there is a demand for a novel DDS preparation of a platinum complex that may be used in clinical fields. There is provided a polymer conjugate of a hexa-coordinated platinum complex, the polymer conjugate comprising a block copolymer having a polyethylene glycol structural moiety and a polyaspartic acid moiety or a polyglutamic acid moiety; and a hexa-coordinated platinum complex having a halogen atom and a hydroxyl group at the axial positions, the hexa-coordinated platinum complex being bonded, directly or via a spacer, to a side-chain carboxyl group of the block copolymer.
目前还没有一种能够在还原条件下选择性释放高活性
铂配合物并表现出高抗肿瘤活性的药物制剂,因此需要一种新型
铂配合物的
DDS制剂来应用于临床领域。本发明提供了一种六配位
铂配合物的聚合物共轭物,该聚合物共轭物包括具有聚
乙二醇结构基团和聚
天冬氨酸基团或聚谷
氨酸基团的嵌段共聚物;以及具有卤原子和羟基在轴向位置的六配位
铂配合物,该六配位
铂配合物通过侧链羧基团与嵌段共聚物直接或通过间隔物键合。