Comment on

• Comparison of prostate specific antigen concentration versus prostate specific antigen density in the early detection of prostate cancer: receiver operating characteristic curves.

  Catalona WJ, Richie JP, deKernion JB, Ahmann FR, Ratliff TL, Dalkin BL, Kavoussi LR, MacFarlane MT, Southwick PC. Catalona WJ, et al. J Urol. 1994 Dec;152(6 Pt 1):2031-6. doi: 10.1016/s0022-5347(17)32299-1. J Urol. 1994. PMID: 7525994 Clinical Trial.
• Selection of optimal prostate specific antigen cutoffs for early detection of prostate cancer: receiver operating characteristic curves.

  Catalona WJ, Hudson MA, Scardino PT, Richie JP, Ahmann FR, Flanigan RC, DeKernion JB, Ratliff TL, Kavoussi LR, Dalkin BL, Waters WB, MacFarlane MT, Southwick PC. Catalona WJ, et al. J Urol. 1994 Dec;152(6 Pt 1):2037-42. doi: 10.1016/s0022-5347(17)32300-5. J Urol. 1994. PMID: 7525995 Clinical Trial.