Abstract:Objective To study the effect of the related parameters of the metabolic syndrome on serum prostate specific antigen (PSA), prostate specific antigen density (PSAD) and the prostate volume (PV). Methods A total of 4,404 men aged 60 to 95 years were enrolled from August 2011 to July 2017 in the First Affiliated Hospital of Xi’an Jiaotong University. The histories of patients combined with digital rectal examination and ultrasound were used to exclude prostate cancer. Systolic blood pressure (SBP), diastolic blood pressure (DBP), weight (W), height (H), waist circumference (WC) and body mass index (BMI) were measured. Biochemical analyses including fasting plasma glucose (FPG), total cholesterol (TC), triglyceride (TG), high-density lipoprotein cholesterol (HDL-C), low-density lipoprotein cholesterol (LDL-C), serum PSA and urine routine analysis were detected. Results The liner regression analysis showed the SBP, TG, HDL-C and LDL-C had statistically positive correlations with serum PSA (P?0.05), while DBP and CHOL had statistically negative correlations with serum PSA (P?0.05). And FPG, LDL-C had statistically positive correlations with PV (P?0.05). BMI, SBP, TG, HDL-C and LDL-C had statistically positive correlations with serum PSAD (P?0.05), and WC, DBP, FPG, TC and PSAD had statistically negative correlations with PSAD (P?0.05). After multiple linear regression analysis, it showed that PSA, PSAD levels are statistical association with SBP, DBP and HDL (P?0.05), while PV was statistical association with FPG (P?0.05). Conclusions The levels of serum PSA and PSAD decrease and PV increases in elderly MS patients. The changes of BP might relate to serum PSA levels, while DM might connect with PV.