Search

Background: Hemiablation is a less morbid treatment alternative for appropriately selected patients with unilateral prostate cancer (PCa). However, to the authors' knowledge, traditional diagnostic techniques inadequately identify appropriate candidates. In the current study, the authors quantified the accuracy for identifying hemiablation candidates using contemporary diagnostic techniques, including multiparametric magnetic resonance imaging (mpMRI) and MRI‐fusion with complete systematic template biopsy. Methods: A retrospective analysis of patients undergoing MRI and MRI‐fusion prostate biopsy, including full systematic template biopsy, prior to radical prostatectomy in a single tertiary academic institution between June 2010 and February 2018 was performed. Hemiablation candidates had unilateral intermediate‐risk PCa (Gleason score [GS] of 3+4 or 4+3, clinical T classification ≤T2, and prostate‐specific antigen level <20 ng/dL) on MRI‐fusion biopsy and 2) no contralateral highly or very highly suspicious Prostate Imaging Reporting and Data System version 2 (PI‐RADSv2) MRI lesions. Hemiablation candidates were inappropriately selected if pathologists identified contralateral GS ≥3+4 or high‐risk ipsilateral PCa on prostatectomy. The authors tested a range of hemiablation inclusion criteria and performed multivariable analysis of preoperative predictors of undetected contralateral disease. Results: Of 665 patients, 92 met primary hemiablation criteria. Of these 92 patients, 44 (48%) were incorrectly identified due to ipsilateral GS ≥3+4 tumors crossing the midline (21 patients), undetected distinct contralateral GS ≥3+4 tumors (20 patients), and/or ipsilateral high‐risk PCa (3 patients) on prostatectomy. The rate of undetected contralateral disease ranged from 41% to 48% depending on inclusion criteria. On multivariable analysis, men with anterior index tumors were found to be 2.4 times more likely to harbor undetected contralateral GS ≥3+4 PCa compared with men with posterior lesions (P < .05). Conclusions: Clinicians and patients must weigh the risk of inadequate oncologic treatment against the functional benefits of hemiablation. Further investigation into methods for improving patient selection for hemiablation is necessary. Even with contemporary diagnostic techniques, including magnetic resonance imaging (MRI), MRI‐fusion biopsy, and systematic template biopsy, appropriately identifying unilateral prostate cancer remains difficult. Nearly one‐half of hemiablation candidates based on preoperative radiographic, clinical, and pathologic factors harbored pathology, making them inappropriate for hemiablation in their radical prostatectomy specimen. [ABSTRACT FROM AUTHOR]

Multiparametric magnetic resonance imaging (mpMRI) has transformed the management of localized prostate cancer by improving identification of clinically significant disease at diagnosis. Approximately 20% of primary prostate tumors are invisible to mpMRI, and we hypothesize that this invisibility reflects fundamental molecular properties of the tumor. We therefore profiled the genomes and transcriptomes of 40 International Society of Urological Pathology grade 2 tumors: 20 mpMRI-invisible (Prostate Imaging-Reporting and Data System [PI-RADS] v2 <3) and 20 mpMRI-visible (PI-RADS v2 5) tumors. mpMRI-visible tumors were enriched in hallmarks of nimbosus, an aggressive pathological, molecular, and microenvironmental phenomenon in prostate cancer. These hallmarks included genomes with increased mutation density, a higher prevalence of intraductal carcinoma/cribriform architecture pathology, and altered abundance of 102 transcripts, including overexpression of noncoding RNAs such as SCHLAP1. Multiple small nucleolar RNAs (snoRNAs) were identified, and a snoRNA signature synergized with nimbosus hallmarks to discriminate visible from invisible tumors. These data suggest a confluence of aggressive molecular and microenvironmental phenomena underlie mpMRI visibility of localized prostate cancer. We examined the correlation between tumor biology and magnetic resonance imaging (MRI) visibility in a group of patients with low- intermediate-risk prostate cancer. We observed that MRI findings are associated with biological features of aggressive prostate cancer. Genome-wide copy number alteration and transcriptomic profiling of tumors invisible and visible on multiparametric magnetic resonance imaging (mpMRI) identified a confluence of aggressive transcriptomic, genomic, and pathological hallmarks correlated with mpMRI visibility. This work provides a molecular basis for the observation that mpMRI-visible tumors are clinically more aggressive. [ABSTRACT FROM AUTHOR]

Purpose: We investigated the perspectives of women suffering from recurrent urinary tract infections using patient focus group discussions with an emphasis on patient attitudes toward the current prevention and treatment of urinary tract infection episodes., Materials and Methods: Twenty-nine women with recurrent urinary tract infections were recruited from a tertiary urology practice to participate in one of 6 focus groups. Participants were asked questions related to urinary tract infection knowledge, prevention strategies, treatment and impact on quality of life. Grounded theory methods were used to analyze focus group transcripts and identify preliminary themes that describe patient attitudes toward current management strategies for recurrent urinary tract infections., Results: The median age of participants was 46 years (range 20-81). The majority were Caucasian and held a college degree. The 7 preliminary themes identified during discussions fell into 2 categories: 1) negative impacts of taking antibiotics for prevention and treatment of recurrent urinary tract infections, and 2) resentment of the medical profession regarding their management of recurrent urinary tract infections. From the preliminary themes, the emergent concepts of "fear" and "frustration" became evident., Conclusions: Focus group discussions of women with recurrent urinary tract infections suggest that many women are fearful of the adverse effects of antibiotics and are frustrated with the medical profession for not addressing their fears and optimizing antibiotic stewardship. There is a need for physicians to modify management strategies to address these concerns and to devote more research efforts to improving the nonantibiotic options for prevention and treatment of recurrent urinary tract infections, as well as management strategies that better empower patients.

Purpose: Oncologic efficacy of focal therapies in prostate cancer depends heavily on accurate tumor size estimation. We aim to evaluate the agreement between radiologic tumor size and pathological tumor size, and identify predictors of pathological tumor size., Materials and Methods: This single arm study cohort included all consecutive patients with biopsy proven prostate cancer and a corresponding PI-RADS®v2 3 or greater index tumor on multiparametric magnetic resonance imaging who subsequently underwent radical prostatectomy. Radiologic tumor size was defined as maximum tumor diameter on multiparametric magnetic resonance imaging and compared to whole mount histopathology tumor correlates. The difference between radiologic tumor size and pathological tumor size was assessed, and clinical, pathological and radiographic predictors of pathological tumor size were examined., Results: A total of 461 consecutive lesions in 441 men were included for statistical analysis. Mean radiologic tumor size and pathological tumor size was 1.57 and 2.37 cm, respectively (p <0.001). Radiologic tumor size consistently underestimated pathological tumor size regardless of the preoperative covariates, and the degree of underestimation increased with smaller radiologic tumor size and lower PI-RADSv2 scores. Pathological tumor size was significantly larger for biopsy Gleason Grade Group (GG) 5 compared to GG1 (mean change 0.37 cm, p=0.014), PI-RADSv2 5 lesions compared to PI-RADSv2 4 (mean change 0.26, p=0.006) and higher prostate specific antigen density. The correlations between radiologic tumor size vs pathological tumor size according to biopsy GG and radiologic covariates were generally low with correlation coefficients ranging between 0.1 and 0.65., Conclusions: Multiparametric magnetic resonance imaging frequently underestimates pathological tumor size and the degree of underestimation increases with smaller radiologic tumor size and lower PI-RADSv2 scores. Therefore, a larger ablation margin may be required for smaller tumors and lesions with lower PI-RADSv2 scores. These variables must be considered when estimating treatment margins in focal therapy.

Prostate-specific membrane antigen (PSMA)-based imaging seeks to fill some critical gaps in prostate cancer staging and response assessment, and may select patients for treatment with radiolabeled PSMA conjugates. In biochemical recurrence, at prostate-specific antigen (PSA) levels as low as 0.2 ng/dL, 68 Ga-PSMA imaging has demonstrated a 42% detection rate of occult metastatic disease, and detection has been greater than 95% when PSA levels are higher than 2 ng/dL. This may facilitate novel approaches, including salvage lymphadenectomy or metastasis-directed radiation therapy, in patients with oligometastatic disease. PSMA-based imaging has shown promise in evaluating treatment response in hormone-sensitive and castration-resistant disease; however, additional longitudinal assessment is needed given the heterogeneity in uptake changes after the initiation of androgen-deprivation therapy. Changes in uptake must be taken in context of RECIST measurements and other response parameters, given the potential for growth of PSMA-negative lesions and persistent uptake in treated bone lesions of uncertain significance. For selecting patients to receive PSMA-targeted radioconjugate therapy, standardized uptake value thresholds remain to be established. Nevertheless, preliminary data from 177 Lu-PSMA theranostic trials have yielded PSA responses in up to 57% of patients, as well as pain relief and improved quality of life. Thrombocytopenia was the most common grade 3 or greater toxicity; however, grade 1 xerostomia occurred frequently and was cited as the most common reason for treatment discontinuation.