CTSL and prostate neoplasm: After normalization by the pathologist estimated epithelium percentage, the average measured EpCAM was 32.02 ± 21.32 and 73.27 ± 34.12 ng/mg total protein/epithelium percentage for normal prostate tissues and prostate tumors respectively (Figure 5E); The average measured CTSL was 19.99 ± 7.78 and 20.74 ± 10.53 ng/mg total protein/epithelium percentage for normal prostate tissues and prostate tumors (Figure 5F).