In an attempt to improve the antitumor activity and decrease the cytotoxicity of camptothecin, 18 new 10-substituted camptothecin derivatives were prepared. The cytotoxicity in vitro on cancer cell lines and antitumor activity in vivo, and inhibitory properties of topoisomerase I of these derivatives were evaluated. Most of these derivatives possessed lower cytotoxicities than CPT, and the compounds
                                    为了提高
喜树碱的抗肿瘤活性并降低其细胞毒性,制备了18种新的10-取代的
喜树碱衍
生物。评价了这些衍
生物在体外对癌
细胞系的细胞毒性和体内抗肿瘤活性,以及拓扑异构酶I的抑制特性。这些衍
生物大多数具有比C
PT更低的细胞毒性,并且化合物13、21、22、23和24显示出与C
PT类似的拓扑异构酶I抑制活性。在我们制备的所有衍
生物中,类似物13在体内表现出最好的抗肿瘤活性。