Cytotoxic agents bearing a polyethylene glycol (PEG) linking group having a terminal active ester, cytotoxic conjugates comprising one or more cytotoxic agents linked to a cell-binding agent via PEG linking groups, and methods for producing both are disclosed. A therapeutic composition comprising a therapeutically-effective amount of one of the cytotoxic conjugates of the present invention, and a method of killing selected cell populations comprising contacting target cells, or tissue containing target cells, with an effective amount of one of the cytotoxic conjugates, are also disclosed.
本发明公开了具有末端活性酯的聚
乙二醇(P
EG)连接基的细胞毒素药剂,包括通过P
EG连接基将一种或多种细胞毒素药剂与细胞结合剂连接的细胞毒素结合物,以及制备这两种物质的方法。本发明还公开了治疗组合物,包括本发明的一种细胞毒素结合物的治疗有效量,以及一种杀死选定细胞群的方法,包括用一种细胞毒素结合物的有效量接触目标细胞或含有目标细胞的组织。