[Mass screening for prostatic cancer].

Two mass screening programs for prostatic cancer (PC) have been conducted at our institution. The first program, based on transrectal ultrasonography (TRUS), was performed between 1975 and 1995 in a total of 16,313 men over 55 years of age. Those showing abnormal findings on TRUS were referred to the secondary urological examination including needle biopsy of the prostate. PC was detected in 93 men (0.6%) and 43 of them were in the early stage. In 1995, a new mass screening program for PC was performed in an urban area of Kyoto. Of 3,749 men over 55 years of age who took the annual health checkup organized by the government, 2,387 wished to receive this screening. The primary examination consisted of Delfia prostate specific antigen (PSA) assay of dried blood samples on a filter paper. Men with PSA levels > 4.0 and < or = 10.0 ng/ml showing abnormal findings on TRUS and/or digital rectal examination, or PSA density > 0.15, underwent 6 sextant biopsies under transrectal ultrasonography, as well as men with PSA levels > 10.0 ng/ml. PSA levels were < or = 4.0 in 2,217 men, > 4.0 and < or = 10.0 in 107, and > 10.0 in 43. Prostatic biopsy was performed in 102 men. PC was detected in 28 men (1.2%) and 17 of them were in the early stage. These findings suggest that the PSA-based mass screening program for PC combined with the annual health checkup is suitable for future "national-level" screening.