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 acetoxy-methyl-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.
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