Prostate cancer is one of the most common malignancies among males. 125I brachytherapy is a current, effective, comparatively safe, and easy-to-reproduce treatment. The Russian X-ray Radiology Research Center has implanted 125I microsources in patients with localized and locally advanced prostate cancer since 2003; 689 125I implantations were performed in the past year. Tumor-specific survival after brachytherapy did not differ greatly from that following radical prostatectomy. Thus, brachytherapy is a current high-tech treatment for prostate cancer. This therapy shows fewer adverse postradiation effects than radiation teletherapy.