The cytotoxic CD8 lymphocytes had slightly lower PCa and BHP tissue sample values without significant differences in controls (PCa 31.25 ± 17.55 and BPH 26.00 ± 14.49 vs. C 45.00 ± 28.28, p > 0.05, Table 5, Figure 5). This evidence concerns the gene CD8A and benign prostatic hyperplasia.