Comparative antitumor activity of ruthenium derivatives with 5?-deoxy-5-fluorouridine in chemically induced colorectal tumors in SD rats

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Abstract
The activity of the newly synthesized ruthenium derivative imidazolium-bis(imidazole)tetrachlororuthenate (III) [ImH(RuIm2Cl4)] was compared with that of 5′-deoxy-5-fluorouridine (5′dFUR) in autochthonous acetoxymethyl-methylnitrosamine (AMMN)-induced colorectal cancer in SD rats. Following coloscopic diagnosis of colorectal tumors treatment was administered twice weekly for a 10-week period. ImH(RuIm2Cl4) exhibited considerable antitumoral efficacy compared with 5′dFUR (20 T/C % and 60 T/C %, respectively) against the growth of AMMN-induced colorectal adenocarcinoma in SD rats. The mortality rates with ImH(RuIm2Cl4) were dose-related, but its efficacy did not vary in all doses administered.