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Preservation surgeries have been applied for cancer of the urinary bladder in 202 cases during the past twenty years. We herein report the result of a statistical analysis on the background factors which determine the tumor recurrence rates and metastatic rates. The background factors analysed were as follows: size of tumors, number of tumors, histological staging, grading, lymph vessel permeation (ly) and vessel invasion (v). Each factor was analysed by Kaplan-Meier method and multiple regression analysis. By Kaplan-Meier method, tumor size, stage, grade, ly and v were closely related to the tumor recurrence and metastasis. By multiple regression analysis, tumor size, stage and ly were important for recurrence, while tumor size, stage and v were important for metastasis. In this study, histological grading was not so closely related to tumor recurrence and metastasis.

FACTORS INFLUENCING THE RECURRENCE RATE AND METASTATIC RATE OF BLADDER CANCER