Establishment of Reference Ranges for Prostate Volume and Annual Prostate Volume Change Rate in Korean Adult Men: Analyses of a Nationwide Screening Population

Impact of metabolic syndrome-related factors on the development of benign prostatic hyperplasia and lower urinary tract symptoms in Asian population

This study aimed to investigate the metabolic syndrome-related risk factors for the development of benign prostatic hyperplasia (BPH) with lower urinary tract symptoms (LUTS) in healthy men.A total of 4880 healthy men who underwent transrectal ultrasonography at our hospital during routine health examinations were included in this study. Those who had undergone a prior biopsy or surgery for prostate disease, were suspected of having urinary tract infection, or were taking BPH/LUTS or metabolic syndrome medications were excluded. BPH/LUTS was defined as an International Prostate Symptom Score (IPSS) of ≥8 and a prostate volume (PV) of ≥30 cm.The subjects had a mean age of 54.1 years, PV of 29.2 cm, prostate-specific antigen (PSA) level of 1.20 ng/mL, and IPSS of 9.2. The annual PV growth rate was 0.48 cm/year. Age, body mass index (BMI), PSA, basal metabolic rate, apolipoprotein A-1, fasting blood glucose, high-density lipoprotein (HDL) cholesterol levels were significant predictive factors for PV. Age, PSA, apolipoprotein B, fasting blood glucose, cholesterol, HDL, and low-density lipoprotein (LDL) levels were predictors of BPH/LUTS at the initial health examination. A decreased fat mass and LDL level were a significant risk factor for the development of BPH/LUTS within 5 years in men without a BPH/LUTS diagnosis at the initial examination.Metabolic syndrome-related variables were strongly associated with BPH/LUTS and by decreasing fat mass and LDL levels, development of BPH/LUTS could be prevented within 5 years in healthy Korean men.

Longitudinal changes in prostate volume in a community-based cohort study of middle-aged and elderly men in rural China

BACKGROUND

Prostate volume (PV) and its change rate are important for the progression of prostate disease, but studies on their estimates are inconsistent.

OBJECTIVES

To investigate whether age, prostate-specific antigen (PSA), and other specific characteristics are associated with PV and its change rate.

MATERIALS AND METHODS

A community-based cohort study was conducted in a rural area of China among male residents aged 40-80 years. PV was estimated at baseline and at 4 years of follow-up by trans-abdominal ultrasound. Annual PV change rate (PVCR) was calculated as change in volume divided by time interval. Baseline characteristics, including age, serum PSA, and hormones, were evaluated. And their relationships with PV or PVCR were assessed with Pearson correlation and multivariate linear regression analyses.

RESULTS

Totally, 462 participants completed the follow-up with baseline PV (PV₀ ) of 15.6 ± 5.5 ml. PV₀ was highly correlated with age and PSA in pairwise correlations (Pearson r = 0.35 and 0.34, respectively, p < 0.01). Multivariate linear regression showed similar associations that PV₀ tended to increase with age and PSA. The average PVCR was 0.7 ± 1.8 ml/year. In pairwise correlations, PVCR was inversely correlated with PV₀ and positively correlated with PSA, while it was not significantly related to baseline age. Linear regression of PVCR on age and PSA in groups classified by PV₀ quartile showed that age was not a significant estimator of PVCR, whereas PSA was. In each PV₀ group, PVCR tended to increase with PSA.

DISCUSSION AND CONCLUSION

PV was positively associated with age and PSA, and it tended to grow faster in men with smaller baseline PV and higher PSA. PSA can be a valuable parameter for estimating both the size and the growth speed of prostate. Although age is associated with prostate enlargement, it does not appear to be related to the longitudinal change rate of PV.

Mesenchymal stem cells and the embryonic reawakening theory of BPH

The prostate is the only organ in a man that continues to grow with age. John McNeal proposed, 40 years ago, that this BPH is characterized by an age-related reinitiation of benign neoplastic growth selectively in developmentally abortive distal ducts within the prostate transition-periurethral zone (TPZ), owing to a reawakening of inductive stroma selectively within these zones. An innovative variant of this hypothesis is that, owing to its location, the TPZ is continuously exposed to urinary components and/or autoantigens, which produces an inflammatory TPZ microenvironment that promotes recruitment of bone marrow-derived mesenchymal stem cells (MSCs) and generates a paracrine-inductive stroma that reinitiates benign neoplastic nodular growth. In support of this hypothesis, MSCs infiltrate human BPH tissue and have the ability to stimulate epithelial stem cell growth. These results provide a framework for defining both the aetiology of BPH in ageing men and insights into new therapeutic approaches.

Three novel methods to measure the postoperative displacement of lower urinary tract structures following radical prostatectomy in a sample of Korean patients

BACKGROUND

There is a change in the position of the remaining anatomical structures of the lower urinary tract system following radical prostatectomy. The aims of this investigation were to describe three novel methods used to measure the displacement of i) the vesico-urethral junction (VUJ), proximal membranous urethra (PMU) and anorectal junction (ARJ) and ii) the VUJ angle of displacement in men following radical prostatectomy and determine their intra- and interrater reliability.

METHODS

Retrospective comparative measurement of twenty pre- and postoperative MRI scans was undertaken by one observer on two separate occasions and on one occasion by another observer. Three standardized midsagittal pelvimetry reference lines were used to describe three X, Y axis measurement systems. The displacement (mm) of the VUJ, PMU and ARJ, and the angle of displacement (degrees) of the VUJ was measured for each of the three methods. Interrater reliability of VUJ, PMU and ARJ displacement and the VUJ angle of displacement measurements was assessed using a two-way mixed-effects agreement intra-class correlation coefficient (ICC) with 95% confidence intervals (CI). Test-retest (intrarater) reliability was calculated using a two-way random effects consistency ICC with 95% CI for all displacement measures of the VUJ, PMU and ARJ for one observer between two days.

RESULTS

The pubococcygeal line (PCL) axis measurement system demonstrated good to excellent intrarater and interrater reliability (ICC 95% interval lower bound > 0.75) for the VUJ and PMU displacement and the VUJ angle of displacement measurements. Other measurement systems were less reliable and more variable.

CONCLUSIONS

In this sample of 20 Korean patients with median prostate volume 27.5 mL and maximum volume 70 mL, the measurement methodology using the PCL consistently demonstrated good to excellent reliability and the lowest variability for the measurement of the displacement of the VUJ and PMU and the VUJ angle of displacement. The PCL methodology is recommended as the method of choice. Further studies should validate these results in patients with large prostate volumes.