KLK3 and benign prostatic hyperplasia: BMI: body mass index, T.CHO: total cholesterol, TG: triglyceride, HDL: high-density lipoprotein, LDL: low-density lipoprotein, VLDL: very low-density lipoprotein, PSA: prostate-specific antigen, IGF-1: insulin-like growth factor-1, BPH: benign prostatic hyperplasia, PCA: prostate cancer.