Since the first report on the efficacy of sextant biopsy under transrectal ultrasound guidance, there have been many modifications related to the total number of cores and the localization of biopsies to improve the prostate cancer (PCa) detection rate. The 2010 National Comprehensive Cancer Network Early PCa Detection Guidelines noted the 12-core biopsy scheme as the standard. However, this extended biopsy scheme still fails to detect 20% of high-grade PCa that can be detected by detailed pathological evaluation of radical prostatectomy; therefore, there is need for saturation biopsies. The existence of suspicions of PCa after previous negative biopsy or biopsies represents a valid indication for saturation biopsy. There has been no significant increment in morbidity or in insignificant PCa detection rates when a saturation biopsy scheme was used with an extended biopsy scheme. Along with the improvement in the PCa detection rate, accurate oncological mapping of PCa is another important consideration of saturation biopsies. The ideal number of cores and the diagnostic value of saturation biopsy after the failure of initial therapy are some of the issues that need to be addressed. Preliminary reports have shown that magnetic resonance imaging can improve the PCa detection rate, save patients from unnecessary biopsies, and decrease the need for a high number of cores; however, multiple limitations continue to exist.Keywords: Prostate; prostate biopsy; prostate cancer
History of prostate biopsy (PBx)Watanabe et al. [1] first introduced the use of transrectal ultrasound-guided (TRUSG) biopsy into the armamentarium of prostate cancer (PCa). Hodge et al. [2] reported on the efficacy of sextant biopsy under TRUS guidance for PCa detection. Initially, only ultrasonically detected hypoechoic areas were sampled. [3,4] In 1995, Stamey et al. [5] suggested that biopsy should be obtained from a more lateral location to better sample the anterior horn of the peripheral zone. Similarly, Norberg et al. [6] noticed that the second set of sextant biopsies performed immediately after the first set increased the PCa detection rate by as much as 30%. These findings prompted investigators to seek alternative biopsy schemes with an increased number of biopsy cores and/or sampling of the lateral peripheral zones for improved PCa detection. [7][8][9][10][11][12][13][14][15] Mc Neal et al. [16] provided the ground for better sampling of peripheral zones with special attention to the anterior horn. These modifications related to the total number of cores and the localization of biopsies improved the PCa detection rate.
Extended biopsy schemeUzzo et al. [17] and Karakiewcz et al. [18] were the first to demonstrate an increase in the PCa detection rate in proportion to the number of biopsy cores obtained. Their findings provided the foundation for extended PBx where at least 10 cores are taken. Chen et al. [19] examined various biopsy schemes to define the approach associated with the highest PCa detection rate. They suggested that...