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We retrospectively studied the toxic effects in 14 patients with urothelial cancer who had undergone intra-arterial M-VAC chemotherapy (Group A) and 13 patients who had received intravenous M-VAC chemotherapy (Group V) between February 1991 and August 1995. No statistically significant differences were found in the white blood cell count nadir, liver function, renal function or appetite between the groups. While the platelet count nadir for intra-arterial infusion (14.0 x 10(4)/mm3) was larger than for intravenous infusion (9.0 x 10(4)), the median days to nadir for this count was shorter in the intra-arterial group (9.1 days) than in the intravenous group (13.5). In addition, the difference between the beginning hemoglobin level and the nadir level was larger in the intra-arterial infusion group (2.55 g/dl) than in the intravenous infusion group (1.95 g/dl). Additionally peculiar side effects were noted in the intra-arterial infusion group which included local erythema and nerve paralysis. Side effects should be managed for intra-arterial M-VAC as well as for intravenous infusion.