The present invention relates to cytostatics which have a tumour-specific action as a result of linkage to &agr;
v
&bgr;
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 &agr;
v
&bgr;
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.
本发明涉及细胞毒素,其通过与&agr;v&bgr;3整合素拮抗剂连接而具有肿瘤特异性作用,所述连接单元通过
弹性蛋白酶选择性切割,即一种特别存在于肿瘤组织中的酶。所述优选连接单元提供了细胞毒素和&agr;v&bgr;3整合素拮抗剂的共轭物在
生物液体中足够的稳定性,并且由于其特异性的酶解或
水解可释放细胞毒素,从而在肿瘤细胞内产生所需的细胞内作用。