1973 Volume 64 Issue 4 Pages 287-294
Statistical studies about heterotopic recurrence rate were performed on 55 inpatients with primary superficial tumors of the urinary bladder admitted to the department of urology of the Nara Medical University from January 1, 1963 to December 31, 1970 and who had no pre- or post-treatments for recurrence after the first operations.
1) Of the 55 patients, 47 were male and 8 were female. The age distribution of the patients ranged from 23 year-old to 84 year-old, and the maximum incidence lies in the 6th decade of both sexes.
2) The recurrence rate was 16.3% within 6 months, 25.4% within 1 year, 38.6% within 3 years and 35.4% within 5 years. There was no significant difference between heterotopic recurrence and sex difference.
3) The heterotopic recurrences occured in most (90.9%) patients with recurrence within 3 years after the first operations.
4) The recurrence rate in patients who were admitted within 3 months after the initial symptoms was lower than in patients who were admitted over 3 months after the initial symptoms.
5) The recurrence rate in the single tumors was lower than multiple tumors for the observation period over 6 months. The rate within 6 months showed no significant difference between both groups.
6) No significant difference of the recurrence rate was observed according to the methods of the first treatments.
7) The recurrence rate in the tumors of low stage was somehow lower than the tumors of high stage. No significant difference of the recurrence rate was statistically found between the tumors of low grade and those of high grade.
8) About heterotopic recurrence of the tumors of urinary bladder, it is considered that stimulations by continued action of carcinogens in the urine and multicentric tumorigenesis are more important problem.
