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Japanese Journal of Clinical Oncology 13:411-416 (1983)
© 1983 Foundation for Promotion of Cancer Research

research-article

Chronological Changes in Latent Prostatic Carcinoma Found in Surgical Specimens from Japanese during 28 Years

HIDEKI KOMATSU, M.D., SEIZO HORIUCHI, M.D.*, HAYAKAZU NAKAZAWA, M.D., TSUNEO OYAMATSU, M.D., KANJI NAKAGAWA, M.D., SHINJI YOSHINO, M.D.** and MAKOTO FUJIME, M.D.***

Urology Division Tokyo
**Pathology Division. Tokyo Teishin Hospital Tokyo
***Department of Urology, Faculty of Medicine, The University of Tokyo Tokyo

Reprint requests: Hideki Kornatsu, M.D., Urology Division, Tokyo Teishin Hospital, 14-23, Fujimi-cho 2-chorne, Chiyoda-ku, Tokyo 102, Japan.

Received June 10, 1983; Out of 1,193 specimens from open prostatectomies in Japanese at Tokyo Teishin Hospital during the 28 years from 1953 to 1980, 38 focal type latent prostatic carcinomas were found. These were classified histologically by Gleason's criteria and subdivided into two groups, a low grade group (patterns 1 and 2) and a high grade group (patterns 3, 4 and 5). The incidence of the focal type of latent prostatic carcinoma in 1967–1980 was significantly higher than that in 1953–1966 (P < 0.05). The incidence of the high grade group was significantly higher in ihe recent 14-year period (P < 0.05), while the incidence of the low grade group was not The prevalence of latent prostatic carcinoma in the Japanese male population, especially the prevalence of the high grade group, may have increased during these 28 years, which may be associated with the increasing mortality rate for prostatic cancer in the Japanese.


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