CTSL and prostate neoplasm: After computer-aided normalization, the average measured EpCAM was 39.11 ± 16.69 and 82.70 ± 39.56 ng/mg total protein/epithelium percentage for normal prostate tissues and prostate tumors respectively (Figure 5C); the average measured CTSL was 27.27 ± 10.38 and 23.44 ± 12.80 ng/mg total protein/epithelium percentage for normal prostate tissues and prostate tumors (Figure 5D).