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Prostatic specific antigen and immunoglobulin binding factor in human seminal plasma and prostate.

Antibodies raised against prostatic specific antigen (PSA) and immunoglobulin binding factor (IgBF) of human seminal plasma (SP) were used to localize the antigens in various tissues by Western blot. Both antigens were found only in the prostate, including benign prostatic hypertrophy and prostatic adenocarcinoma. The polyclonal anti-PSA antibodies stained five prostatic protein bands with estimated M(r) values of 10, 14, 22, 25, and 33 kD, whereas anti-IgBF antibodies stained a single 16-kD protein. No cross-reaction occurred between the two antibodies. When anti-PSA antibodies were used an additional protein with an estimated M(r) of 35 kD was detected in the extract of benign prostatic hypertrophy, but not with normal prostate or prostatic cancer. When SP and prostatic proteins were analyzed by SDS-PAGE under nonreducing condition and immunoblot with both antibodies, immunoreactive proteins with estimated M(r) of 125 and 140 kD, respectively, were stained, suggesting that both factors may be produced as an aggregated precursor molecule. Since IgBF was found only in the prostate, this component may be useful as a marker of prostatic tissue.

Animals↗

[Usefulness of free prostate specific antigen in the detection of prostate cancer].

BACKGROUND: The predictive value of prostate specific antigen for prostate cancer, when levels are between 4 and 10 ng/ml, is low. Within these range of values, some authors recommend the measurement of the free fraction of the antigen to improve its predictive capacity. AIM: To evaluate the predictive value of the free fraction in subjects with prostate specific antigen values between 4 and 10 ng/ml. PATIENTS AND METHODS: One hundred and forty subjects with prostate specific antigen between 4 and 10 ng/ml were evaluated. All were subjected to transcrectal ultrasound examination with biopsies and the free fraction of the antigen was measured by enzyme immuno assay. RESULTS: Cancer was diagnosed in 36 subjects, all others had a benign prostatic hyperplasia. Mean prostate specific antigen values were 7.4 and 7.1 ng/ml in patients with cancer and hyperplasia, respectively. The percentage of free prostatic specific antigen was 9.8 and 19.8% in subjects with cancer and hyperplasia respectively (p < 0.001). Using receiver operating characteristic (ROC) curves, a free prostate specific antigen of 13% was the best cutoff value for predicting prostate cancer. CONCLUSIONS: In subjects with prostate specific values between 4 and 10 ng/ml, the measurement of the free fraction of this antigen can improve the predictive value of this parameter for the detection of prostate cancer.

Adult↗

Preoperative serum prostate-specific antigen (PSA) below 10 microg/l predicts neither the presence of prostate cancer nor the rate of postoperative PSA failure.

Recent information on the relationship of serum prostate-specific antigen (PSA) to prostate cancer and new reports on death rates in men warrant a reassessment of how we diagnose and treat prostate cancer. We now know for the first time that the annual death rate from prostate cancer in men > or =65 years of age is only 226 per 100 000 men. At least 40 000 of 100 000 men over age 65 (40%) have invasive prostate cancer as judged by examination of prostates in 3- to 4-mm step-sections. Thus, only 1 of every 177 men 65 years of age or older (226 in 40 000) with invasive prostate cancer dies annually from his cancer. Serum PSA between 2 and 10 microg/L is used almost universally as an indication to biopsy the prostate. When 10-20 biopsies are commonly taken, it is not surprising that approximately 40% of men are biopsy-positive for prostate cancer. Despite this reliance on serum PSA as an indication for biopsy, data at Stanford show no clinically useful relationship between preoperative serum PSA (in the range 2-10 mg/L) and the volume of Gleason grade 4/5 cancer or the volume of Gleason grades 3, 2, and 1 cancer, nor can we show any useful relationship of such preoperative PSA concentrations (2-10 microg/L) to biochemical PSA failure rates after radical prostatectomy. We urgently need a better serum marker for prostate cancer. Because PSA biochemical failure rates after radical prostatectomy are directly proportional to the amount of Gleason grade 4/5 cancer in the prostate, a serum marker of Gleason grade 4/5 carcinoma could be ideal.

Humans↗

Preoperative serum prostate specific antigen levels between 2 and 22 ng./ml. correlate poorly with post-radical prostatectomy cancer morphology: prostate specific antigen cure rates appear constant between 2 and 9 ng./ml.

PURPOSE: Serum prostate specific antigen (PSA) is widely used as a guide to initiate prostatic biopsies and to follow men older than 50 years old with and without prostate cancer. However, benign prostatic hyperplasia (BPH) is a common cause of serum PSA values between 2 and 10 ng./ml. A better understanding of the relationships among serum PSA, prostate cancer and BPH is important. MATERIALS AND METHODS: A total of 875 men underwent radical prostatectomy at our institution between December 1984 and January 1997. Of these men 784 had a serum PSA of 2 to 22 ng./ml., including 579 with the largest cancer located in the peripheral zone of the prostate. Of the 579 men 406 had serum PSA followups for greater than 3 years after radical prostatectomy. We examined Pearson correlations (R2) between preoperative serum PSA, and the volume of Gleason grades 4/5 and 3 to 1 cancer in 784 men, separating peripheral zone from transition zone cancers. We used broken line regression with break points of 7 and 9 ng./ml. preoperative PSA to summarize the relationship of each PSA doubling to 5 different morphological variables in 579 men with peripheral zone cancer. A 9 ng./ml. break point was used for prostate weight. Trend summaries with a local regression line for the relationships between 6 morphological variables and PSA were superimposed on full scatterplots of the 579 men with PSA less than 22 ng./ml. Cox proportional hazard models were used to examine 5-year PSA failure-free probabilities based on 406 men with minimal PSA followups greater than 3 years at break points of 7 to 9 ng./ml. PSA. RESULTS: Pearson correlation between cancer volume and preoperative serum PSA in 875 men was weak (r2 = 0.27) and driven by large cancers with serum PSA greater than 22 ng./ml. For peripheral zone cancer the overall R2 x 100 for 641 men with low and high grade cancer was 10% and only 3% for low grade cancer, that is almost no PSA produced by these peripheral zone cancers enters the serum. All morphological variables changed at rates of doubtful medical significance below a PSA of 7 to 9 ng./ml. but at rates that were significantly worse above 9 ng./ml. R2 for these relationships was never greater than 15%. Large individual morphological variations at all levels of PSA emphasize the serious limitation of PSA as a predictor of prostate cancer morphology. Below 9 ng./ml. prostate weight increased by 21% for each doubling of PSA but above 9 ng./ml. the increase was only 4.8%. CONCLUSIONS: Preoperative serum PSA has a clinically useless relationship with cancer volume and grade in radical prostatectomy specimens, and a limited relationship with PSA cure rates at preoperative serum PSA levels of 2 to 9 ng./ml. Trend summaries for prostate weight on broken line regression showed that below 9 ng./ml. BPH is a strong contender for the cause of PSA elevation, constituting the primary cause of the over diagnosis of prostate cancer.

Age Factors↗

[Relation of age and prostatic volume to cancer detection in prostatic biopsies from patients with non-suspect rectal palpation].

OBJECTIVES: To evaluate which clinical variables are predictive for prostate cancer and possible relationships among them, in patients with elevated PSA and non suspicious digital rectal examination (DRE) undergoing first prostate biopsy. METHODS: 1618 patients with elevated PSA and non suspicious DRE who underwent sextant peripheral prostate biopsy were selected from our database. PSA, age, prostate volume, and detectable nodule by ultrasound were selected as variables related to cancer detection in first and second biopsies. RESULTS: Mean age was 67.5 +/- 7.4 (37-88) years, mean PSA was 16.9 +/- 116.5 (3.6-4500) ng\ml, mean prostate volume was 65.7 +/- 37.8 (8-352) cc. 23.3% patients presented a hypoechoic nodule within the peripheral zone of the gland. 18.8% presented prostate cancer on first biopsy. On multivariate analysis, age (p < 0.001), prostate volume (p < 0.001), and presence of a nodule on ultrasound (p = 0.003) were considered independent predictive variables for cancer detection on biopsy. Direct relationship with age, and inverse relationship with prostate volume were shown. Detection rates on second biopsy were greater in patients with prostates = 40 cc in comparison to those > 40 cc (p = 0.02). First two biopsies detected 95% of cancer cases, first three up to 98%. CONCLUSIONS: Age and prostate volume should be taken into consideration when individualizing the number of cores to obtain at the time of biopsy. The efficacy of peripheral sextant biopsy in prostates = for 40 cc should be re-evaluated. Third and fourth biopsies should be reserved for patients with very adverse risk factors.

Adult↗

[Our experience about utility of the prostate mapping (8 + 8 biopsy) in the diagnosis of prostate tumour].

PURPOSE OF THE WORK: Can patients derive a real benefit from increasing the number of prostate biopsies as regards Hodge's method (3 biopsies PZ per lobe) or can they only suffer from an eventual increase in complications? MATERIALS AND METHODS: From January 1998 to May 2001 we did 324 biopsies sextant with 6 biopsies (3 biopsies PZ per lobe), 146 of which (45%) were positive for tumour. We did the prostate mapping (6 PZ: 1 TZ: 1 AZ per lobe) on 97 patients who kept on having PSA alterations even though they were negative. Of these 97, 10 (10.3%) had a PSA between 3 and 4 ng/ml and pathological rate PSA free/total, 35 (36.1%) had a PSA greater than 10 ng/ml and 52 (53.6%) had a PSA between 4 and 1.0 ng/ml with a pathological rate PSA free/PSA total. Dividing the patients according to the prostate volume, 67 (69%) had a prostate less than 50 ml and 30 (31%) had a prostate volume superior to 50 ml. RESULTS: Of the 97 patients tested 27 (27.8%) were positive for tumour with an increase in diagnosis of 18.49%. 3 patients out of 10 (30%) with a PSA less than 4 ng/ml were positive for tumour with an increase in diagnosis of 12.5%. 15 patients out of 52 (28.8%) with a PSA between 4 and 10 ng/ml and rate pathological PSA free/PSA total were positive for tumour with an increase in diagnosis of 30% and 9 out of 35 (25.5%) with PSA superior to 10 ng/ml were positive with an increase in diagnosis of 12%. Stratifying the data about prostate volume, 10 patients out of 67 (14.62%) with a prostate volume less than 50 ml were positive, with an increase in diagnosis of 10.5% and 8 patients out of 30 (26.6%) with a prostate volume greater than 50 ml were positive with an increase in diagnosis of 15.68%. CONCLUSIONS: In our experience, prostate mapping increased of 18.49% the rate of positive diagnoses compared with the classic protocol proposed by Hodge. It resulted useful, in particular for the patients with PSA between 4 and 10 ng/ml (increase in diagnosis of 30%) and for the patients with prostate volume greater than 50 ml (increase in diagnosis of 15.68%). Obviously, according to our results, we propose the prostate mapping to patients with persisting high PSA after negative biopsies and after having excluded contagious-inflammation pathologies.

Aged↗

[Tumor markers in prostate cancer--clinical significance and future prospect of prostate specific antigen (PSA)].

Prostate specific antigen (PSA), which has high organ specificity, is an excellent tumor marker that has played a significant role in the diagnosis and treatment of prostate cancer. Screening for prostate cancer using PSA is now widely employed in Japan, and increased detection of cases with organ-confined prostate cancer is hoped to result in a decreased number of cancer-specific deaths. Although PSA has also played a critical role in as a marker for staging, assessment of treatment, and recurrence of prostate cancer, many useless biopsies are performed due to its low cancer specificity. To increase the specificity in prostate cancer detection, PSA-related markers including PSAD (PSAPZD), PSAV, and age-specific PSA were advocated, and the ratio of free PSA to total PSA (% free PSA) is also used in a clinical setting. However, since those markers can not satisfactorily exclude benign prostate diseases, various molecular forms of PSA have been analyzed using proteomics and glycomics. Recently, it was demonstrated that plasma free PSA consisted of precursor PSA (pPSA) and other isoforms, suggesting that [-2] pPSA may be a helpful marker for prostate cancer. Our group reported that a sugar chain structure of PSA in the serum of prostate cancer patients is different from that of patients with benign prostate hyperplasia. The different sugar chain structure of PSA can be easily detected by a conventional method and is expected to be useful for differential diagnosis between malignant and benign prostate diseases.

Biomarkers, Tumor↗

[The usefulness of percentage of free prostate specific antigen/prostate specific antigen density in the diagnosis of prostate cancer].

OBJECTIVE: To investigate the usefulness of percentage of free prostate specific antigen (FPSA/TPSA) in serum/PSA density [(F/T)/PSAD] in the diagnosis of prostate cancer. METHODS: Two hundred and four patients who had been carried out transrectal ultrasound guided prostate biopsy, were involved in this study. Among them, 90 patients were proved to be suffering from prostate cancer, and other 114 patients were identified as benign prostate hypertrophy. The effect of total serum PSA level, FPSA/TPSA, PSAD and (F/T)/PSAD in the diagnosis of prostate cancer were investigated, and at the same time, selecting patients who should be carried out a prostate biopsy. RESULTS: The mean values of (F/T)/PSAD were significantly lower for patients with prostate cancer in different PSA levels (<4.0, 4.0-, 10.1-, >20.0 microg/L), when compared with benign prostate hypertrophy patients. This difference has arrived statistical significance (P < 0.05). (F/T)/PSAD could provide higher specificity for diagnosing prostate cancer than FPSA/TPSA or PSAD. Among all patients, at the same higher sensitivity (about 90%), the specificity of FPSA/TPSA, PSAD and (F/T)/PSAD was 31.6%, 45.6% and 64.0%, respectively. At the same time, it was suggested that clinicians use different cutoffs for (F/T)/PSAD in different PSA level. When PSA level of patients was no more than 4.0 microg/L, 2.5 as the commended cutoff for (F/T)/PSAD was preferred; if PSA level was between 4.0 microg/L and 20.0 microg/L, 0.8 was a more suitable cutoff; 0.5 also could be taken as an appropriate cutoff in case of PSA level being higher than 20.0 microg/L. CONCLUSIONS: Keeping high sensitivity, using of (F/T)/PSAD can improve the diagnostic specificity of prostate cancer significantly.

Adult↗

[Significance of prostate fluid carcinoembryonic antigen in the diagnosis of prostate cancer].

Clinical studies of carcinoembryonic antigen (CEA) in prostate fluid were performed on 121 men; 29 patients with prostate cancer, 65 with benign prostatic hypertrophy, 10 with prostatitis and 17 without any prostatic diseases. The CEA level in prostate fluid in the prostate cancer group was significantly higher than that in any other group. However, it could not demonstrate any particular advantage when compared with the prostate specific antigen (PSA) in serum. Additional research was done comparing the sensitivity and specificity of CEA level in prostate fluid in the population with slightly elevated PSA level (3.0-14.9 ng/ml). The sensitivity and the specificity were 82% and 83%, respectively. These findings suggest the usefulness of the measurement of prostate fluid CEA as an adjunctive tool in the diagnosis of prostate cancer in the population with a slightly elevated PSA level.

Carcinoembryonic Antigen↗

Preneoplastic prostate lesions: an opportunity for prostate cancer prevention.

Environmental factors, especially the diet, play a prominent role in the epidemic of prostate cancer (PCA), in the United States. Many candidate dietary components have been proposed to influence human prostatic carcinogenesis, including fat, calories, fruits and vegetables, anti-oxidants, and various micronutrients, but the specific roles dietary agents play in promoting or preventing PCA remain controversial. We have collected evidence to suggest that GSTP1, the gene encoding the pi-class glutathione S-transferase (GST), may serve a "caretaker" function for prostatic cells. Although GSTP1 can be detected in normal prostatic epithelium, in almost all PCA cases, PCA cells fail to express GSTP1 polypeptides, and lack of GSTP1 expression most often appears to be the result of somatic "CpG island" DNA methylation changes. Loss of GSTP1 function also appears to be characteristic of prostatic epithelial neoplasia (PIN) lesions, thought to represent PCA precursors. We have recently learned that a new candidate early PCA precursor lesion, proliferative inflammatory atrophy (PIA), characterized by proliferating prostatic cells juxtaposed to inflammatory cells, contains epithelial cells that express high levels of GSTP1. These findings have formed the basis for a new model of prostatic carcinogenesis, in which prostatic cells in PIA lesions, subjected to a barrage of inflammatory oxidants, induce GSTP1 expression as a defense against oxidative genome damage. When cells with defective GSTP1 genes appear amongst the PIA cells, such cells become vulnerable to oxidants and electrophiles that inflict genome damage that tends to promote neoplastic transformation to PIN and PCA cells. Subsequently, PIN and PCA cells with defective GSTPI genes remain vulnerable to similar stresses tending to promote malignant progression. This new model for prostatic carcinogenesis has implications for the design of new prostate cancer prevention strategies. Rational prevention approaches might include: (i) restoration of GSTPI expression via treatment with inhibitors of CpG methylation, (ii) compensation for inadequate GSTPI activity via treatment with inducers of general GST activity, and (iii) abrogation of genome-damaging stresses via avoidance of exogenous carcinogens and/or reduction of endogenous carcinogenic (particularly oxidant) stresses.

Adenocarcinoma↗

Prostate Biopsy in the staging of prostate cancer.

The use of prostate biopsies was developed in parallel with progress in our knowledge of prostate cancer and the use of prostate-specific antigen (PSA). Prostate biopsies were initially indicated for the diagnosis of cancer, by the perineal approach under general anesthesia. Nowadays prostate biopsies are not only for diagnostic purposes but also to determine the prognosis, particularly before radical prostatectomy. They are performed in patients with elevated PSA levels, by the endorectal approach, sometimes under local anesthesia. The gold standard is the sextant biopsy technique described by Hodge, which is best to diagnose prostate cancer, particularly in case of T1c disease (patients with serum PSA elevation). Patients with a strong suspicion of prostate cancer from a negative series of biopsies can undergo a second series with transition zone biopsy or lateral biopsy. Karakiewicz et al and Uzzo et al proposed that the number of prostate biopsies should depend on prostate volume to improve the positivity rate. After the diagnosis of prostate cancer, initial therapy will depend on several prognostic factors. In the case of radical prostatectomy, the results of sextant biopsy provide a wealth of information. The aim of this report is to present the information given by prostate biopsy in the staging of prostate cancer.

Journal Article↗

Diagnostic dilemmas in detection of prostate cancer in patients undergoing transrectal ultrasound-guided needle biopsy of the prostate.

Transrectal ultrasound (TRUS)-guided needle biopsy of the prostate is a widely practised method for obtaining high quality tissue cores for histological diagnosis in men with suspected prostate cancer. Technological advances such as high-resolution hand held probes with biplanar imaging capabilities and spring-loaded needles that easily permit multiple biopsies to be obtained have ensured that this technique has rightly taken its place at the forefront of prostate cancer diagnosis. However, the capacity for TRUS to identify prostate cancer remains limited because of poor specificity and variability in the ultrasonic appearance of tumours. Widespread prostate-specific antigen (PSA) testing has increasingly resulted in greater numbers of tumours being diagnosed at an early stage, when they are clinically impalpable and ultrasonically indistinguishable from surrounding normal prostate tissue. In this setting, the principal role for TRUS is to facilitate systematic sampling of all relevant zones of the prostate. Despite advances in technology and in our understanding of this disease, a number of diagnostic dilemmas arise. Should we perform lesion-directed or random biopsies? How many tissue cores should be obtained for optimal diagnostic yield, to reduce the incidence of false-negative biopsies? What areas of the prostate should be biopsied to give the best diagnostic results? If the initial biopsies fail to detect cancer, who should undergo repeat biopsy? Some have also voiced concern that TRUS risks identifying clinically insignificant disease. Here, we review the studies that have addressed these issues and have lead to the evolution of TRUS-guided prostate biopsy into an essential tool in the detection of carcinoma of the prostate. Prostate Cancer and Prostatic Diseases (2000) 3, 13-20

Journal Article↗

[Diagnostic and prognostic value of serum prostate specific antigen in prostate carcinoma].

The upper normal limit of serum prostate specific antigen (PSA) of 4 ng/ml is positively evaluated since it discriminates a large percentage of patients having prostate cancer. The PSA limit of 2.5 ng/ml may be used accordingly for patients younger than 50 years of age. The PSA range of 3.3-4 ng/ml may indicate a percentage of patients positive for prostate carcinoma. The PSA above 10 ng/ml indicates that patients have prostate carcinoma by more than 50 %, which is more than double as compared to patients having PSA limits between 4.1-10 ng/ml. It is important to repeat doubtful PSA tests after 3-4 months. If within a year an increase in PSA of more than 2 ng/ml is detected, a high risk of death from prostate cancer is expected. The time for doubling PSA values within a year is described as "velocity index". As for free PSA, this test is not often applied in many nuclear medicine centers. According to the Mayo Clinic, USA, instructions, when total PSA is 2-3.9 ng/ml and free PSA above 18% of these values, the possibility of prostate cancer is less than 10%. On the contrary, for the above total PSA values, if free PSA is less than 10% of these values, the possibility of prostate cancer increases to more than 30%. It is suggested that PSA values be expressed per g of prostate tissue in order to relate to prostate volume. However, one should have in mind that prostate carcinomas have less PSA per g than hyperthophic glands and their volume is usually larger. There are cases where treatment of prostate hypertrophy with finasteride or treatment of prostate cancer with anticancer drugs, may induce a false low PSA. More information about the practical importance of PSA values is expected after 2 or 3 years when a study by the National Cancer Institute of USA on 74,000 men will be completed.

Editorial↗

Prostatic acid phosphatase levels (enzymatic method) from completely sectioned, clinically benign, whole prostates.

Clinically benign, whole untrimmed prostates were obtained from 104 patients at autopsy, completely sectioned, and examined microscopically. The histological and gross findings of the prostate were correlated with premortem prostatic acid phosphatase levels (PAP, enzymatic method, ACA, Dupont Co.) to determine how often carcinoma of the prostate (CAP) affected PAP levels and to identify other findings within the prostate associated with elevated PAP levels. Sixty (58%) prostates did not have CAP, 34 (33%) had CAP smaller than 1 ml in volume, and 10 (10%) had CAP larger than 1 ml in volume. PAP levels were elevated (greater than 1 U/L) in 8 of 60 (13%) prostates without CAP, in 2 of the 34 (6%) prostates with CAP smaller than 1 ml, and in 1 of the 10 (10%) prostates with CAP larger than 1 ml. These differences were not statistically significant. Likewise, a statistically significant correlation between PAP levels and patient age, patient race, severe inflammation, of high grade prostatic intraepithelial neoplasia (PIN) was not found. However, there was a statistically significant correlation between PAP levels and prostate weight (p < 0.0001). This study suggest that PAP cannot distinguish between patients with clinically undetected CAP and patients without CAP. Furthermore, elevated PAP levels are often not due to metastatic CAP and additional evidence should be present, even in patients with known CAP, before an elevated PAP level is considered to be conclusive evidence of metastatic CAP.

Acid Phosphatase↗

Holmium laser enucleation of the prostate for the treatment of lower urinary tract symptoms in men with benign prostatic hyperplasia.

RATIONALE: A range of surgical options is available for the treatment of benign prostatic hyperplasia (BPH), including holmium laser enucleation of the prostate (HoLEP). The evidence is unclear regarding differences in functional, perioperative, and morbidity outcomes between these modalities. OBJECTIVES: To assess the effects of holmium laser enucleation of the prostate compared with other surgical treatments for lower urinary tract symptoms in men with benign prostatic hyperplasia. SEARCH METHODS: We searched multiple databases (including MEDLINE, Embase, CENTRAL, Web of Science, LILACS, and the International HTA database), trial registries, and conference abstracts through April 08, 2026. ELIGIBILITY CRITERIA: We only included randomized trials of men over 40 years of age with a prostate volume of at least 20 mL (assessed by digital rectal examination, ultrasound, or conventional imaging) who exhibited lower urinary tract symptoms (LUTS) defined by an International Prostate Symptom Score (IPSS) of eight or greater undergoing surgical interventions for BPH. OUTCOMES: The critical outcomes measured were the urologic symptoms score, the quality-of-life score, and major adverse events. The important outcomes measured were: re-treatment, erectile function, ejaculatory function, transfusions, acute urinary retention, indwelling urinary catheter duration, and hospital stay duration. RISK OF BIAS: We used the Cochrane risk of bias tool (RoB 1) to assess for potential sources of bias on a study and outcome level basis. SYNTHESIS METHODS: We pooled outcome data using the random-effects model and performed meta-analyses using the Mantel-Haenszel method. We assessed statistical heterogeneity in the pooled data by visually inspecting forest plots and using the I2 statistic to quantify it. We used the GRADE framework to assess the certainty of evidence. INCLUDED STUDIES: We included 52 trials that included 6242 participants that compared HoLEP to other surgical interventions for benign prostatic hyperplasia. The median age of participants across the studies ranged from 65 to 74 years. The baseline prostate volume ranged from 30 cc to 142 cc. Baseline IPSS scores ranged from 19.6 to 28.6 (range 0-35). SYNTHESIS OF RESULTS: We prioritized comparing HoLEP with transurethral resection of the prostate (TURP) at short-term follow-up (up to 12 months), because TURP is the long-standing reference standard and the predominant comparator in randomized surgical trials. Findings for the four remaining comparisons (laser ablation, alternative energy source enucleation, other minimally invasive therapies, and simple prostatectomy), for long-term follow-up, and for all remaining outcomes are reported in full in the review. Compared to TURP, at short-term follow-up: Critical outcomes - HoLEP may result in little to no difference in short-term urologic symptom scores measured using the IPSS (range 0 to 35; lower values reflect fewer symptoms) (MD -0.67, 95% CI -1.20 to -0.14; I&#xb2; = 93%; 14 studies, 1666 participants, low-certainty evidence). - HoLEP may result in little to no difference in short-term quality of life (range 0 to 6; lower values reflect better quality of life) (MD -0.04, 95% CI -0.23 to 0.15; I&#xb2; = 73%; 6 studies, 876 participants, low-certainty evidence). - HoLEP may result in little to no difference in short-term major adverse events (RR 0.75, 95% CI 0.35 to 1.58; I&#xb2; = 0%; 10 studies, 1147 participants, low-certainty evidence). Important outcomes - HoLEP likely results in little to no difference in re-treatment (RR 0.45, 95% CI 0.14 to 1.50; I&#xb2; = 0%; 8 studies, 813 participants, moderate-certainty evidence). - HoLEP likely results in little to no difference in erectile function (MD -0.03, 95% CI -0.47 to 0.42; I&#xb2; = 0%; 3 studies, 518 participants, moderate-certainty evidence). - Ejaculatory function: we did not find any data for this outcome. - HoLEP likely reduces the need for blood transfusion (RR 0.19, 95% CI 0.09 to 0.42; I&#xb2; = 0%; 15 studies, 1755 participants, moderate-certainty evidence). AUTHORS' CONCLUSIONS: Compared with TURP, HoLEP may achieve similar relief of urologic symptoms, similar quality of life, and similar rates of major adverse events in the first 12 months after surgery, and probably similar re-treatment rates and erectile function. HoLEP likely reduces the need for blood transfusion; this is the only advantage of HoLEP that the randomized evidence, as summarized here, supports as clinically important. There was insufficient evidence to assess outcomes in the subset of individuals with larger prostates or on anticoagulation. Future research should prioritize long-term trials reporting sexual function and urinary incontinence outcomes, recruit men with very large prostates (&#x2265; 150 cc) or on anticoagulation therapy, and evaluate cost-effectiveness and training requirements. FUNDING: No external funding was received for this review. REGISTRATION: The protocol for this review was published in the Cochrane Database 2019 (https://doi.org/10.1002/14651858.CD013291).

Humans↗

Ventral prostate predominant l, a novel mouse gene expressed exclusively in the prostate.

BACKGROUND: Despite the region-specific nature of human prostate disease, there is a paucity of information regarding the molecular basis of prostate regionalization and patterning. To elucidate genetic mechanisms that underlie prostate growth and development, we investigated differential gene expression in mouse prostate lobes. METHODS: mRNA differential display analysis was used to identify differentially expressed genes during development of ventral, anterior, and dorsolateral prostate lobes. Differential gene expression was confirmed by Northern blot analysis and RT-PCR. RESULTS: A novel gene, Ventral prostate predominant1 (Vpp1) was identified. Vpp1 mRNA was evident in all lobes but accumulated predominantly in the ventral prostate, and was detected on postnatal day 7 through adulthood exclusively in the prostate gland. The steady-state level of Vpp1 mRNA decreased markedly in response to castration, suggesting androgen regulation of Vpp1 expression. Analysis of TRAMP tumors demonstrated a dramatic decrease in the level of Vpp1 mRNA. CONCLUSIONS: The spatial distribution and early postnatal onset of Vpp1 expression is consistent with a role for this gene in prostate regionalization. The absolute prostate specificity of Vpp1 expression may allow this gene to serve as a paradigm to study the molecular basis of gene expression that is restricted exclusively to the prostate gland.

Adenocarcinoma↗

T-cell recognition of a prostate specific antigen is not sufficient to induce prostate tissue destruction.

METHODS: The ability of CD8(+) T-cells to induce prostate inflammation was examined using a prostate ovalbumin expressing transgenic mouse (POET) and/or adoptive transfer of T-cell receptor (TCR) transgenic T-cells (OT-I) that specifically recognize ovalbumin. Localization of inflammatory cells to prostate tissue was examined following T-cell activation via endogenous prostatic antigen, recombinant type 5 adenovirus carrying the gene coding ovalbumin (Ad5-mOVA), or adoptive transfer of in vitro antigen stimulated OT-I cells. RESULTS: Ovalbumin specific OT-I cells were activated by autologous prostate antigen and trafficked to the prostate, but did not induce inflammation unless present in overwhelming numbers ( approximately 65% of CD8(+) T-cells). Activation of antigen specific CD8(+) T-cells in vitro (peptide pulsed antigen presenting cells) or in vivo (Ad5-mOVA) induced transitory prostate inflammation, without induction of prostate pathology, regardless of CD4(+) T-cell availability. Inflammation also was observed in OT-I x POET mice but again, pathological effects were not observed. CONCLUSIONS: T lymphocytes specific for a prostate antigen are capable of inducing inflammatory infiltration of prostatic tissue rapidly following activation, but do not produce pathological prostate injury.

Adoptive Transfer↗

Comparison of dihydrotestosterone levels in prostatic cancer metastases and primary prostate cancer.

Dihydrotestosterone (DHT) concentration, a marker for biochemical differentiation and possible clonal origin of prostate tumors, was measured in cancer present in lymph nodes (LN) from patients with untreated metastatic prostate cancer and compared to levels in untreated primary prostate cancer. The mean DHT of 2.23 ng/g in LN (S.E. = 0.28, N = 22) was significantly less (P less than .001) than the mean DHT of 4.8 ng/g in primary cancer (S.E. = 0.52, N = 20). Since primary prostate cancer may be admixed with stromal tissue, while lymph node represents pure epithelial cell tumor, we chose for this comparison only the 20 prostate cancer tissues that were judged by our pathologist to contain 90% or more epithelial cell tumor. Using this selection criteria, we found that prostate stroma, which has an average DHT concentration 1.18 times higher than prostate epithelia, would have an insignificant effect on primary prostate tumor DHT concentration. These data suggest that the decreased DHT in prostate tumor cells present in LN metastases may be a marker for a clone of cells with metastatic potential. These findings are consistent with previous reports from this laboratory indicating that DHT concentration less than 2.4 ng/g in primary prostate cancer is a predictor of a reduced disease-free interval following androgen blockade in advanced prostate cancer.

Dihydrotestosterone↗