The present invention relates to cytostatics which have a tumour-specific action as a result of linkage to α
v
β
3
integrin antagonists via preferred linking units which can be selectively cleaved by elastase, i.e. by an enzyme which can especially be found in tumour tissue. The preferred linking units provide sufficient stability of the conjugate of cytostatic and α
v
β
3
integrin antagonist in biological fluids and, at the same time, the desired intracellular action within tumour cells as a result of its specific enzymatic or hydrolytic cleavability with release of the cytostatic.
本发明涉及一种细胞毒素,通过与αvβ3整合素拮抗剂通过优选的连接单元结合,从而具有肿瘤特异性作用,这些连接单元可以被
弹性蛋白酶选择性地剪断,即一种特别存在于肿瘤组织中的酶。优选的连接单元在
生物液体中为细胞毒素和αvβ3整合素拮抗剂的结合物提供足够的稳定性,并且通过特定的酶解或
水解释放细胞毒素,在肿瘤细胞内实现所需的细胞内作用。