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[Clinical significance of multiple mucosal biopsies in new cases of superficial papillary bladder tumor].

We assessed the clinical significance of multiple mucosal biopsies in new cases of superficial papillary bladder tumor. Biopsy findings were abnormal (5 dysplasia, 5 transitional carcinoma) in 10 of the 71 cases examined. Abnormalities were observed exclusively at G2 or G3, and more frequently at pT1 than pTa. Cases with multiple tumors showed significantly more abnormalities than cases with a solitary tumor. Recurrence rates were not significantly different between the cases with abnormal biopsy findings and those with normal findings. However, the invasive tumor developed more frequently in the former. Mucosal biopsies seemed to be more useful in cases with multiple tumors than in those with a solitary tumor.