Additionally, it remains controversial how the 5α-reductase level changes with prostate cancer development and progression, as shown in a recent study by Wako et al. [42]: using semiquantitative immunohistochemical analysis, they found no significant change in SRD5A1 and SRD5A2 levels between localized prostate cancer samples and normal prostatic tissues. The gene discussed is SRD5A2; the disease is prostate carcinoma.