Antitumor activity of 1,2-diaminocyclohexaneplatinum complexes against Sarcoma-180 ascites form

Platinum complexes derived from three isomers of 1,2-diaminocyclohexane have been synthesized and their antitumor activities were evaluated against ascites Sarcoma-180. All the platinum complexes had high antitumor activity. Platinum complexes derived from cis-1,2-diaminocyclohexane were more effective than those derived from trans-l-and trans-d-1,2-diaminocyclohexane. Among the platinum complexes tested, oxalato(cis-1,2-diminocyclohexane)platinum had a remarkably high therapeutic index. Modification of the nonleaving group as well as that of the leaving group is important in order to find better antitumor platinum complexes.