“…In Japan, approximately 94,000 men were newly diagnosed with prostate cancer in 2019, and the number of deaths from prostate cancer in the same year was about 12,500, with an increasing trend (2,3). For localized prostate cancer, guidelines list total prostatectomy, externalbeam radiation, and low-dose-rate brachytherapy (LDR-BT) as treatment options with good outcomes (4)(5)(6). The disease progression of local prostate cancer has already been clarified, and while active surveillance is an option, even with conservative therapy alone, the 15-year prostate cancerspecific survival rate is 88% and 65% for those with low-and intermediate-risk of treatment failure, respectively (7).…”