We treated a 61-year-old patient with a diagnosis of bilateral ureteral carcinoma in situ with percutaneous perfusions of mitomycin C. After 16 sessions of mitomycin C therapy instilled through bilateral nephrostomy tubes, the urine cytology results became negative for malignancy. Bilateral ureteroscopy and cold-cup punch biopsies of the ureter revealed no evidence of disease. The patient did not experience side effects. He has remained free of disease during a 12-month follow-up period. Percutaneous perfusion of mitomycin C appears to be one of the effective and safe treatments for the carcinoma in situ of the upper urinary tract.
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