Björn Löppenberg

The Impact of Real-Time Elastography Guiding a Systematic Prostate Biopsy to Improve Cancer Detection Rate: A Prospective Study of 353 Patients

PURPOSE We evaluated whether real-time elastography guided biopsy improves prostate cancer detection compared to conventional systematic gray scale ultrasound guidance. MATERIALS AND METHODS A total of 353 consecutive patients suspicious for prostate cancer were prospectively randomized for real-time elastography (178) or gray scale ultrasound (175). Each patient enrolled in the study underwent a 10-core prostate biopsy. Six lateral prostate sectors (base, mid, apex) were scanned for cancer suspicious areas, defined as stiffer blue lesions using real-time elastography and hypoechoic lesions using gray scale ultrasound. Suspicious areas were sampled by a single targeted biopsy and considered representative of a defined prostate sector. If real-time elastography or gray scale ultrasound did not visualize a suspicious area in a sector, the biopsy core was taken systematically. Imaging findings were correlated with histopathological reports. Real-time elastography and gray scale ultrasound cases were compared in terms of cancer detection rate and imaging guidance accuracy. RESULTS Characteristics of patients undergoing real-time elastography and gray scale ultrasound, including age, prostate specific antigen, prostate volume and digital rectal examination, were not significantly different (p>0.05). Prostate cancer was detected in 160 of 353 patients (45.3%). The prostate cancer detection rate was significantly higher in patients who underwent biopsy with the real-time elastography guided approach compared to the gray scale ultrasound guided biopsy at 51.1% (91 of 178) vs 39.4% (69 of 175) (p=0.027). Overall sensitivity and specificity to detect prostate cancer was 60.8% and 68.4% for real-time elastography vs 15% and 92.3% for gray scale ultrasound, respectively. CONCLUSIONS Sensitivity to visualize and detect prostate cancer improved using real-time elastography in addition to gray scale ultrasound during prostate biopsy. Overall sensitivity did not reach levels to omit a systematic biopsy approach.

Comparison of real-time elastography with grey-scale ultrasonography for detection of organ-confined prostate cancer and extra capsular extension: a prospective analysis using whole mount sections after radical prostatectomy

Study Type – Diagnostic (exploratory cohort) Level of Evidence 2b

Multiparametric ultrasound of the prostate: adding contrast enhanced ultrasound to real-time elastography to detect histopathologically confirmed cancer.

PURPOSE We prospectively assessed whether a combined approach of real-time elastography and contrast enhanced ultrasound would improve prostate cancer visualization. MATERIAL AND METHODS Between June 2011 and January 2012, 100 patients with biopsy proven prostate cancer underwent preoperative transrectal multiparametric ultrasound combining real-time elastography and contrast enhanced ultrasound. After initial elastographic screening for suspicious lesions, defined as blue areas with decreased tissue strain, each lesion was allocated to the corresponding prostate sector. The target lesion was defined as the largest cancer suspicious area. Perfusion was monitored after intravenous injection of contrast agent. Target lesions were examined for hypoperfusion, normoperfusion or hyperperfusion. Imaging results were correlated with final pathological evaluation on whole mount slides after radical prostatectomy. RESULTS Of 100 patients 86 were eligible for final analysis. Real-time elastography detected prostate cancer with 49% sensitivity and 73.6% specificity. Histopathology confirmed malignancy in 56 of the 86 target lesions (65.1%). Of these 56 lesions 52 (92.9%) showed suspicious perfusion, including hypoperfusion in 48.2% and hyperperfusion in 48.2%, while only 4 (7.1%) showed normal perfusion patterns (p = 0.001). The multiparametric approach decreased the false-positive value of real-time elastography alone from 34.9% to 10.3% and improved the positive predictive value of cancer detection from 65.1% to 89.7%. CONCLUSIONS Perfusion patterns of prostate cancer suspicious elastographic lesions are heterogeneous. However, the combined approach of real-time elastography and contrast enhanced ultrasound in this pilot study significantly decreased false-positive results and improved the positive predictive value of correctly identifying histopathological cancer.

The Impact of Local Treatment on Overall Survival in Patients with Metastatic Prostate Cancer on Diagnosis: A National Cancer Data Base Analysis.

BACKGROUND The role of local treatment (LT) in patients with metastatic prostate cancer (mPCa) at diagnosis is controversial. OBJECTIVE We set to evaluate the potential impact of LT on overall mortality (OM) in men with mPCa, and how this impact is influenced by tumor and patient characteristics. DESIGN, SETTINGS, AND PARTICIPANTS A total of 15 501 patients with mPCa were identified in the National Cancer Data Base (2004-2012) and categorized in LT (radical prostatectomy or radiation therapy targeted to prostate) versus nonlocal treatment (NLT; all other patients). OUTCOME MEASUREMENTS AND STATISTICAL ANALYSIS The two arms (LT vs NLT) were matched using propensity scores to minimize selection bias. To evaluate LT impact on OM in relation to baseline characteristics, first multivariable Cox regression analysis was used to predict OM in patients treated with NLT, then interaction between predicted OM risk and LT status was tested. RESULTS AND LIMITATIONS Overall, 9.5% (n=1470) of patients received LT. In the postpropensity matched cohorts, 3-yr OM-free survival was higher in the LT group versus the NLT group (69% vs 54%; p<0.001). In multivariable Cox regression, the NLT group, age, and Charlson comorbidity index were predictors of OM (all p≤0.03). This model was used to predict the 3-yr OM risk. The interaction between predicted OM and LT status was significant (p<0.001). The benefit of LT on OM decreased progressively as predicted OM risk increased. Specifically, the 3-yr absolute improvement in OM-free survival was 15.7%, for patients with predicted OM risk ≤20% versus 0% for those with predicted OM risk ≥72%. CONCLUSIONS Men with mPCa at diagnosis benefit from LT in terms of OM. This is largely affected by baseline characteristics. Specifically, patients with a relatively low tumor risk and good general health status appear to benefit the most. PATIENT SUMMARY We used a large hospital-based database to evaluate which patients might benefit from local therapy when metastasized prostate cancer was present at diagnosis. Local therapy is associated with a survival benefit in men with less aggressive tumors and good general health.

Reporting Complications After Open Radical Retropubic Prostatectomy Using the Martin Criteria

PURPOSE In 2002, 10 Martin criteria were proposed that should be met when reporting complications following surgery. To date, few studies have evaluated complication rates after radical prostatectomy using these criteria. Therefore, we assessed complications in a contemporary series of open retropubic radical prostatectomy using a standardized reporting methodology. MATERIALS AND METHODS Complications in 2,893 consecutive patients who underwent radical prostatectomy at a single center between 2003 and 2009 were recorded prospectively. All 10 Martin criteria for a high quality report of complications were fulfilled. Complications within a 30-day postoperative period were graded retrospectively according to the Clavien-Dindo classification. RESULTS The overall complication rate was 27.7% (801 of 2,893), and 943 medical and surgical complications were recorded in 801 patients. Of these complications 596 were grade I (63.2%), 183 grade II (19.5%), 142 grade III (15.1%) and 15 grade IV (1.8%). The mortality rate (grade V) was 0.1% (4 of 2,893). Independent predictors of high grade complications (grade III or greater) on multivariate analysis were patient age (HR 1.051, p = 0.002), prostate volume (HR 1.013, p = 0.004) and lymphadenectomy (HR 2.023, p = 0.005). CONCLUSIONS Complications after radical prostatectomy should be reported using a standardized methodology. Using the Clavien-Dindo classification we observed an acceptable overall complication rate. In the majority of cases lower grade complications occurred. Patients of older age, those with greater prostate volume and those who had undergone simultaneous lymphadenectomy were at risk for higher grade complications.

Intraoperative Frozen Section of the Prostate Decreases Positive Margin Rate While Ensuring Nerve Sparing Procedure During Radical Prostatectomy

PURPOSE We evaluated whether intraoperative frozen section analysis of the prostate surface might provide significant information to ensure nerve sparing and minimize the positive margin rate. MATERIALS AND METHODS In 236 patients treated with radical prostatectomy between June 2011 and September 2012 whole surface frozen section analysis of the removed prostate was done intraoperatively. The apex and base were circumferentially dissected as well as the whole posterolateral tissue corresponding to the neurovascular bundles. Multiple perpendicular sections were cut systematically for frozen section analysis. Pathology results were reported to navigate the procedure. RESULTS Frozen section analysis identified positive surgical margins in 22% of cases, including the neurovascular bundles in 56.9%, apex in 34.5% and base in 8.6%. Of positive frozen section cases 92.3% could be converted to negative status, while 7.7% remained positive. The final positive margin rate in the total cohort was 3%, including a false-negative frozen section rate of 1.6%. In 14.8% of cases the initial nerve sparing plan was changed intraoperatively due to the positive frozen section and the secondary resected specimen detected cancer in 25%. Final pathology results showed Gleason upgrading or up-staging in 40.7% of cases compared to preoperative variables. When comparing patients with positive vs negative frozen sections, preoperative variables did not significantly differ, while postoperatively pathological stage, tumor volume, operative time and final margin status differed significantly. Of patients with exclusively unilateral positive biopsies 13% had a positive surgical margin intraoperatively on the opposite, biopsy negative side. CONCLUSIONS The surface frozen section technique is associated with a low false-negative surgical margin rate. It might allow for safer preservation of functional anatomical structures in misclassified patients or even patients at higher preoperative risk.

Impact of Real-Time Elastography on Magnetic Resonance Imaging/Ultrasound Fusion Guided Biopsy in Patients with Prior Negative Prostate Biopsies

PURPOSE The fusion of multiparametric resonance imaging and ultrasound has been proven capable of detecting prostate cancer in different biopsy settings. The addition of real-time elastography promises to increase the precision of the outcome of targeted biopsies. We investigated whether real-time elastography improves magnetic resonance imaging/transrectal ultrasound fusion targeted biopsy in patients after previous negative biopsies. MATERIALS AND METHODS Prospectively 121 men underwent 3T magnetic resonance imaging. Using magnetic resonance imaging/real-time elastography fusion every suspicious lesion was characterized according to its tissue density and sampled by 2 fusion guided targeted biopsies. Additionally, all patients underwent 12-core systematic biopsy. The detection rate of clinically significant and insignificant cancers was compared between targeted und systematic biopsies. The accuracy to predict high grade prostate cancer was evaluated for with the PI-RADS scoring system and compared to the magnetic resonance imaging/real-time elastography fusion score. RESULTS Overall prostate cancer was detected in 52 patients (43%). Targeted fusion guided biopsy revealed prostate cancer in 32 men (26.4%) and systematic biopsy in 46 (38%). The proportion of clinically significant cancers was higher for targeted biopsy (90.6%) compared to systematic biopsy (73.9%). The detection rate per core was higher for targeted biopsies (14.7%) compared to systematic biopsies (6.5%, p <0.001). The prediction of biopsy result according to magnetic resonance imaging/real-time elastography fusion was better (AUC 0.86) than magnetic resonance imaging alone (AUC 0.79). Sensitivity and specificity for magnetic resonance imaging/real-time elastography fusion was 77.8% and 77.3% vs 74.1% and 62.9% for magnetic resonance imaging. CONCLUSIONS Magnetic resonance imaging/transrectal ultrasound fusion enhances the likelihood of detecting clinically significant cancers in a repeat biopsy setting. Adding real-time elastography to magnetic resonance imaging supports the characterization of cancer suspicious lesions.

Is there a need for the Fournier's gangrene severity index? Comparison of scoring systems for outcome prediction in patients with Fournier's gangrene

Study Type – Prognosis (prospective cohort)

Comprehensive report on prostate cancer misclassification by 16 currently used low-risk and active surveillance criteria.

Study Type – Prognosis (case series)

An Evaluation of the Timing of Surgical Complications Following Radical Cystectomy: Data From the American College of Surgeons National Surgical Quality Improvement Program

OBJECTIVE To examine time-to-event data for 19 common postoperative complications within 30 days following radical cystectomy (RC). METHODS Patients undergoing RC were identified within the American College of Surgeons National Surgical Quality Improvement Program database (2005-2011). The primary end point was time-to-complication; secondary end points included length of stay (LOS), reintervention, readmission, and 30-day mortality. Further, the complications were stratified into pre- and postdischarge, and the predictors were identified. Lastly, the effect of time-to-complication on secondary outcomes was evaluated. RESULTS Overall, 1118 patients underwent RC. The overall complication rate was 52.1%; the median LOS was 8 days. The vast majority of complications (85.2%) were contained within the first 2 weeks of surgery with a median time-to-complication of 8.5 days; 31.4% of the complications occurred post discharge. In adjusted analyses, increasing age (odds ratio [OR] = 1.02, P < .001), black race (OR = 1.67, P = .001), and creatinine ≥1.2 mg/dL (OR = 1.26, P = .002) were significant predictors of predischarge complications, whereas diabetes (OR = 1.40, P < .001), cardiopulmonary disease (OR = 1.27, P = .005), neoadjuvant therapy (OR = 1.35, P = .007), and continent diversions (OR = 1.30, P = .004) were significant predictors of postdischarge complications. A body mass index of ≥30 was associated with increased odds of pre- as well as postdischarge complications (P < .01). For a given complication, timing did not affect the mortality odds (P = .310), but the risk of reintervention, readmission, and prolonged LOS varied. CONCLUSION One in 2 patients suffers a complication within 30 days of undergoing RC. A vast majority of complications occur early on postoperatively, either pre- or post discharge, highlighting the need for rigorous inpatient as well as outpatient surveillance during this period-knowledge regarding the time-to-complications, the effect of time-to-complications, and risk factors may facilitate improved patient-physician communication and allow patient-tailored follow-up.