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[Epidemiological study of bladder tumor in Taihoku District, Nagano Prefecture].

Masahisa Wajiki, Yutaka Yanagisawa, Naoki Hirabayashi, Shunsuke Uchiyama, Tomio Nakamoto and Akimi Ogawa Department of Urology, Shinshu University School of Medicine, Matsumoto, Japan (Director: Prof. A. Ogawa) Since our previous investigation clarified that the Taihoku district is the highest in morbidity of bladder tumor among 10 districts in Nagano Prefecture, a further epidemiological study was made on 40 patients with bladder tumor inhabiting in this district. They were first diagnosed during the 10 year's period from 1974 to 1983. The results were as follows: 1) Annual morbidity of bladder tumor in the Taihoku district was 6.0 per 100,000 inhabitants of both sexes, 8.9 in males and 3.2 in females. Consequently, the male to female ratio was 2.8:1. 2) The age, sex, occupation and favorite dishes were not found to be etiologically significant, and the grade and stage of tumor distributed without special tendency. 3) Among 7 municipalities constituting the Taihoku district, the highest morbidity (14.7), particularly that in female (13.0) was found in A village. The results indicate the necessity of epidemiologically examining inhabitants of A village.