CTSB and neoplasm: Comparison of the number of transcripts in healthy and malignant transformed tissue revealed a statistically significant reduction of the amount of transcripts in tumors originating from breast compared to healthy tissue (mean number of CTSB copies ± SD; healthy vs. tumor 13,276 ± 3527 n = 2 vs. 2583 ± 3674 n = 23, Mann–Whitney test; p = 0.002).