Brachytherapy and organ preservation in the management of carcinoma of the prostate

Abstract

The treatment of organ-confined carcinoma of the prostate with permanent radioisotopes by the retropubic method has generated variable and controversial results. In this article, the technical flaws of the retropubic approach are discussed. Issues of radiobiological factors, dose inhomogeneity, and case selection are addressed relative to the reported results. Recent advances in radioisotope development, computer based dosimetry, and transrectal ultrasound and computed tomographic imaging have fostered techniques of closed transperineal implantation that produce a more homogeneous, reproducible, and larger volume implant with a higher peripheral dose rate than was possible in the past. With a median follow-up of 37 months (range 12 to 78 months), 93% of 291 early stage A-B patients treated with (125)I or (130)Pd alone showed a normal posttreatment prostate-specific antigen (PSA) (median value 0.4). In 160 more advanced stage A-C patients treated with external beam irradiation and implant boost, 85% showed a normal PSA (median value 0.3). The elimination of surgery with these techniques permits outpatient treatment resulting in high patient acceptance. If longer follow-up substantiates the favorable early results, these methods may potentially offer the least morbid and least expensive method of treatment for early stage carcinoma of the prostate.