MT-ND2 and benign prostatic hyperplasia: Based on the results, set 3 was selected for BPH (NADH dehydrogenase subunit 1), set 4 for SBPH (NADH dehydrogenase subunit 2), and set 1 for WBPH (NADH dehydrogenase subunit 2) (Table S1 and Figure 2).