As is shown, men treated by radical prostatectomy had a better adjusted survival rate than men without prostate cancer suggesting selection biases for favorable outcomes for these men compared with those treated with radiotherapy. (From Giordano SH et al: Limits of observational data in determining outcomes from cancer therapy. Cancer 2008;112:2456–2466.) Source: Chapter 26. Radiotherapy of Urologic Tumors, Smith & Tanagho's General Urology, 18e Citation: McAninch JW, Lue TF. Smith & Tanagho's General Urology, 18e; 2013 Available at: https://accessmedicine.mhmedical.com/DownloadImage.aspx?image=/data/books/mcan18/mcan18_c026f003.png&sec=41091864&BookID=508&ChapterSecID=41088103&imagename= Accessed: November 12, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved