BPH并前列腺炎对血清PSA的影响

目的：探讨BPH并前列腺炎对患者血清PSA的影响。方法：收集2006年9～12月期间在四川大学华西医院行经尿道前列腺电切术的BPH患者52例,术前行经直肠前列腺B超柃查,检测血清PSA,记录年龄和是否存在急性尿潴留;术中切取前列腺组织用于细菌16SrDNA Real—time PCR检测和病理检查,诊断有无前列腺炎、炎症程度和炎症类型。采用Logistic多元回归方法,纳入尿潴留、前列腺感染、前列腺体积和年龄等因素的同时分析前列腺腺周炎症、前列腺腺体炎症是否与血清PSA浓度有关。结果：前列腺腺周炎症、前列腺体积和血清PSA升高有关（P=0．027和0．001）。结论：除了前列腺体积外,前列腺腺周炎症是BPH患者血清PSA升高的危险因素。     

Effects of Chronic Bacterial Prostatitis on Prostate Specific Antigen Levels Total and Free in Patients with Benign Prostatic Hyperplasia and Prostate Cancer

Background: Prostatic-specific antigen (PSA), a tumor marker helpful in the diagnosis and follow-up of prostate cancer, may rise due to causes such as prostatitis, chronic benign prostatic hyperplasia (BHP), etc. The aim of this study was to investigate the relationship between prostatitis and the level of total and free prostate-specific antigen in patients with no clinical evidence of prostate cancer. Methods: A comprehensive urological examination was performed on 156 patients aged 35–61 years old. All patients have symptoms of prostatitis. Prostate fluid culture was preformed. All patients underwent a course of antibacterial treatment after which the levels of total prostate specific antigen (TPSA) and free prostate specific antigen (FPSA) were evaluated. Results: An increase in TPSA (>4 ng/ml) was observed in 14/24 (58.3%) patients with acute prostatitis and in 7/45 (15.5%) and 4/44 (9.1%) in patients with chronic bacterial prostatitis (CBP) and a bacterial prostatitis, respectively. Low blood concentration of TPSA and FPSA were observed after effective antibacterial and anti-inflammatory treatment therapy in most cases. Conclusion: These data suggested that prostatitis must be considered when interpretation of TPSA and FPSA values as tumor marker.     

前列腺活检后血清T-PSA动力学指标鉴别前列腺良、恶性病变

目的:探讨前列腺活检后血清总前列腺特异性抗原(total prostate specific antigen,T-PSA)指标鉴别前列腺良、恶性病变的可能性,确定活检前后T-PSA比率的临界值。方法:对血清T-PSA异常的36例患者(平均年龄69.89岁)进行直肠超声引导下前列腺穿刺活检,活检后在第10、30、60、90min分别进行血清T-PSA测定,并描绘血清T-PSA动力图。计算各时间点活检后T-PSA比率(活检后T-PSA/活检前T-PSA)。根据患者的穿刺活检结果将其分为非前列腺癌组和前列腺癌组,并进行两组活检后T-PSA比率的比较。应用统计学方法确定活检前后T-PSA比率鉴别前列腺良、恶性病变的临界值。结果:非前列腺癌组各时间点活检后T-PSA比率明显高于前列腺癌组(P<0.05)。应用ROC曲线计算获得活检后30min和T-PSA比率为1.5时是鉴别前列腺良、恶性病变的最佳时间点和临界值,其敏感性为75%,特异性为93%。结论:前列腺活检后30min时T-PSA比率可有助于筛查前列腺癌高危人群,对于活检后T-PSA比率较低且首次活检结果阴性的患者,应进行重复活检。本结果有待进一步前瞻性研究证实。     

Serum Pro Prostate Specific Antigen Improves Cancer Detection Compared to Free and Complexed Prostate Specific Antigen in Men With Prostate Specific Antigen 2 to 4 Ng/Ml

PurposePro prostate specific antigen (pPSA) is a precursor form of PSA enriched in tumor compared to benign prostate tissues that may be a more specific serum marker for prostate cancer. Serum pPSA was measured in the clinically relevant early detection PSA range of 2 to 10 ng/ml.Materials and MethodsResearch use immunoassays were used to measure native and truncated forms of pPSA. The subject cohort contained 1,091 serum specimens from men enrolled in prostate cancer screening studies at 2 sites who had undergone prostate biopsy and were divided into PSA ranges of 2 to 4 ng/ml (benign 320, cancer 235) and 4 to 10 ng/ml (benign 315, cancer 221).ResultsIn PSA ranges 2 to 4, 2 to 6, 4 to 10 and 2 to 10 ng/ml, pPSA in a ratio with free PSA (%pPSA) gave the highest cancer specificity. At 2 to 4 ng/ml and 90% sensitivity, %pPSA spared 19% of unnecessary biopsies compared to 10% for free PSA and 11% for complexed PSA(p <0.001). Similar results were obtained at PSA 2 to 6 ng/ml. At 90% sensitivity in the PSA 4 to 10 ng/ml range, %pPSA spared 31% of unnecessary biopsies compared to 20% for % free PSA and 19% for complexed PSA (p <0.0001). In the combined 2 to 10 ng/ml range, %pPSA spared 21% of unnecessary biopsies compared to 13% for % free PSA and 9% for complexed PSA (p <0.0001).ConclusionsThe %pPSA significantly improved specificity for cancer detection and decreased the number of unnecessary biopsies in the PSA 2 to 4 ng/ml range. This relative improvement of %pPSA compared to % free PSA and complexed PSA was maintained throughout the PSA range of 2 to 10 ng/ml.     

Total Prostate and Transition Zone Volumes, and Transition Zone Index are Poorly Correlated With Objective Measures of Clinical Benign Prostatic Hyperplasia

Purpose

We determined if total prostate volume, transition zone volume or transition zone index is correlated with the severity of clinical benign prostatic hyperplasia (BPH).

Materials and Methods

A total of 93 men 52 to 85 years old, who were referred to a urology outpatient facility for treatment of clinical BPH, elevated serum prostate specific antigen or abnormal digital rectal examination, underwent measurement of total prostate and transition zone volume at transrectal ultrasonography. All men were requested to undergo uroflowmetry and complete the American Urological Association (AUA) symptom score.

Results

The pairwise correlations between AUA symptom score, versus total prostate and transition zone volumes and transition zone index were not statistically or clinically significant. A weak pairwise relationship was observed between peak flow rate versus total prostate volume (r² = 0.160), transition zone volume (r² = 0.156) and transition zone index (r (²) = 0.147). The pairwise relationships between AUA symptom scores versus all prostate volumes were not statistically significant for subjects with mild (score 8 or less) or moderate to severe (score more than 8) symptoms.

Conclusions

Total prostate and transition zone volumes, and transition zone index are not directly related to AUA symptom score and only weakly related to peak flow rate. These findings provide further evidence that the total prostate, total BPH and relative BPH volumes are not useful determinants of the severity of clinical BPH.