AR and benign prostatic hyperplasia: As per Gu et al., (2012), meta-analysis results showed that CAG repeat polymorphism on AR gene with ≥ 20 repeats might confer a protective effect among 45 year-old patients with PrCa but not all patients with PrCa; moreover, Alptekin et al., (2012) and Lee et al., (2016) also reported that short repeats may comprise high risk for PrCa and BPH, respectively.