Publications by authors named "Karnes R"

Purpose: Perioperative blood transfusion has been reported in > 50% of patients undergoing radical cystectomy (RC). Unfortunately, perioperative blood transfusion (PBT) in patients undergoing RC has been associated with poor oncological outcomes. Tranexamic acid (TXA) use has been proposed to decrease the need for PBT.

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Importance: Although prostate-specific membrane antigen positron emission tomography (PSMA-PET) has shown improved sensitivity and specificity compared with conventional imaging for the detection of biochemical recurrent (BCR) prostate cancer, the long-term outcomes of a widespread shift in imaging are unknown.

Objective: To estimate long-term outcomes of integrating PSMA-PET into the staging pathway for recurrent prostate cancer.

Design, Setting, And Participants: This decision analytic modeling study simulated outcomes for patients with BCR following initial definitive local therapy.

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Background And Objective: We characterized tumor prostate-specific membrane antigen (PSMA) levels as a reflection of cancer biology and treatment sensitivities for treatment-naïve prostate cancer.

Methods: We first correlated PSMA positron emission tomography (PET) maximum standardized uptake values (SUVmax) in primary prostate cancer with tumor FOLH1 (PSMA RNA abundance) to establish RNA as a proxy (n = 55). We then discovered and validated molecular pathways associated with PSMA RNA levels in two large primary tumor cohorts.

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Introduction: To date, radio-recurrent prostate cancer (PCa) ranks as the fourth most common urological malignancy when considering the number of men with localized PCa who undergo radiation treatment and subsequently experience a biochemical recurrence. This systematic review aimed to summarize available evidence about the outcomes of local salvage strategies in patients with local PCa recurrence following primary external-beam radiation therapy (EBRT).

Methods: We conducted a comprehensive bibliographic search on MEDLINE, Scopus, and Web of Science Core Collection databases in October 2023 to identify studies published in the last 20 years evaluating outcomes of local salvage procedures in patients with locally radio-recurrent PCa following EBRT.

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Objective: To compare the predictive ability of the modified Frailty Index (mFI) and the revised Risk Analysis Index (RAI-Rev) for perioperative outcomes in patients undergoing major urologic oncologic surgery, aiming to identify the optimal frailty screening tool for surgical risk stratification.

Methods: NSQIP was queried to identify patients undergoing radical prostatectomy, partial or radical nephrectomy, or radical cystectomy between 2013 and 2017. We investigated the association of mFI and RAI-Rev with the following 30-day perioperative outcomes using multivariable logistic regression: major complications, Clavien grade ≥4 complications, non-home discharge, 30-day readmission, and all-cause mortality.

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Unlabelled: International Society of Urological Pathology grade group 1 (GG 1) prostate cancer (PCa) is generally considered insignificant, with recent suggestions that it should even be considered as "noncancerous". We evaluated outcomes for patients with GG 1 PCa on biopsy (bGG 1) and high-risk features (prostate-specific antigen [PSA] >20 ng/ml and/or cT3-4 stage) to challenge the hypothesis that every case of bGG 1 PCa has a benign disease course. We used the multi-institutional EMPaCT database, which includes data for 9508 patients with high-risk PCa undergoing surgery.

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Background: Retained surgical items (RSI) are preventable events that pose a significant risk to patient safety. Current strategies for preventing RSIs rely heavily on manual instrument counting methods, which are prone to human error. This study evaluates the feasibility and performance of a deep learning-based computer vision model for automated surgical tool detection and counting.

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Background And Objective: A meta-analysis of two randomized STAMPEDE platform trials revealed that 3 yr of abiraterone acetate in addition to androgen deprivation therapy and radiation therapy significantly improved metastasis-free and overall survival (OS) in high-risk nonmetastatic prostate cancer (PCa) and should be considered a new standard of care. The aim of our study was to assess long-term cancer-specific survival (CSS) and OS for surgically treated patients with newly diagnosed nonmetastatic node-negative PCa meeting the STAMPEDE criteria for high risk.

Methods: This was a retrospective, multicenter cohort study of patients with European Association of Urology (EAU) high-risk PCa who underwent radical prostatectomy and extended pelvic lymph node dissection.

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Article Synopsis
  • - The study evaluated 121 patients with penile squamous cell carcinoma (pSCC) to explore how well different methods identify high-risk human papillomavirus (HPV) status and to analyze its prevalence and impact on patient outcomes.
  • - Results showed that 30.6% of patients were high-risk HPV-positive, with a high sensitivity (97.3%) of morphologic evaluation in predicting HPV status; progression was more common in high-risk HPV-negative patients.
  • - The findings suggest that HPV status and certain tumor characteristics can influence prognosis, with differentiation levels in HPV-negative tumors and basaloid morphology in HPV-positive cases playing a significant role in patient mortality.
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Article Synopsis
  • The study investigates factors affecting oncologic outcomes in patients with biochemical recurrence (BCR) of prostate cancer after initial definitive treatment like surgery or radiotherapy.
  • It encompasses a systematic review of 37 studies, analyzing 10,632 patients, and identifies specific risk factors linked to worse outcomes, such as higher tumor stage and shorter time to recurrence, particularly after prostatectomy.
  • The findings emphasize the need for effective risk stratification in managing BCR, suggesting different prognostic indicators based on the type of initial treatment received.
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  • The study investigates the changes in staging criteria for pT2/pT3 penile squamous cell carcinoma (pSCC) and compares the current AJCC criteria with a proposed modified system based on histopathological variables.
  • A total of 48 cases were analyzed, showing no significant difference in disease-free survival (DFS) and progression-free survival (PFS) using AJCC criteria, but significant differences emerged using the modified criteria.
  • The proposed staging system may enhance prognostication for pT2/pT3 pSCC tumors, but further research is required to validate its effectiveness across different patient populations.
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The NCCN Guidelines for Prostate Cancer include recommendations for staging and risk assessment after a prostate cancer diagnosis and for the care of patients with localized, regional, recurrent, and metastatic disease. These NCCN Guidelines Insights summarize the panel's discussions for the 2024 update to the guidelines with regard to initial risk stratification, initial management of very-low-risk disease, and the treatment of nonmetastatic recurrence.

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Purpose: Isolated recurrence in remnants of the seminal vesicles (SV) after treatment of primary prostate cancer (PCa) has become a more frequent entity with the widespread use of more sensitive next-generation imaging modalities. Salvage vesiculectomy is hypothesized to be a worthwhile management option in these patients. The primary goal of this study is to describe the surgical technique of this new treatment option.

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Purpose Of Review: Metastatic prostate cancer (PCa) continues to be an invariably fatal condition. While historically, de-novo metastatic PCa was primarily treated with androgen deprivation therapy (ADT) and systemic therapy, there is a growing trend toward incorporating local treatments in the early management of the disease. This is particularly applicable to men with oligometastatic PCa (OMPC), which represents an 'intermediate phase' between localized and disseminated metastatic disease.

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Context: Despite negative preoperative conventional imaging, up to 10% of patients with prostate cancer (PCa) harbor lymph-node involvement (LNI) at radical prostatectomy (RP). The advent of more accurate imaging modalities such as PET/CT improved the detection of LNI. However, their clinical impact and prognostic value are still unclear.

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Introduction: Variant histology (VH) bladder cancer is often associated with poor outcomes and the role of neoadjuvant chemotherapy (NAC) remains incompletely defined. Our objective was to determine comparative pathologic downstaging at radical cystectomy (RC) following NAC for patients with and without VH.

Patients And Methods: Patients who underwent RC at 2 tertiary referral centers (1996-2018) were included.

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Article Synopsis
  • The study aimed to analyze the prevalence of different types of amyloids in the urinary tract and prostate, as well as the frequency of related systemic amyloidosis.
  • Researchers examined 150 prostate specimens and 767 urinary tract specimens from 2008 to 2020, using a proteomics-based method and reviewing clinical data for a subset of patients.
  • Results showed that over 40% of patients had systemic amyloidosis, with specific amyloid types being more common in respective locations, highlighting the importance of early detection and accurate identification for effective treatment.
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Article Synopsis
  • - The study investigates the expression levels of potential biomarkers (PD-L1, TROP2, and nectin-4) in advanced penile squamous cell carcinoma (pSCC) to address the lack of effective therapeutic markers.
  • - Conducted on 121 patients who underwent surgery for pSCC, the researchers assessed the biomarkers using immunohistochemistry and linked their expressions with HPV status and outcomes.
  • - Results show that high levels of TROP2 and nectin-4 correlate with worse disease progression and offer a potential for future therapeutic targeting in pSCC, pending further validation of the findings.
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Background: The objective of this study was to evaluate the prognostic value of early PSA decline following initiation of second-generation hormone therapy (2nd HT), namely abiraterone acetate or enzalutamide, in patients with taxane-refractory metastatic castrate-resistant prostate cancer (mCRPC) and evaluate utility of this metric in informing intensified surveillance/imaging protocols.

Methods: We retrospectively identified 75 mCRPC patients treated with 2nd HT following docetaxel failure (defined as PSA rise and radiographic progression). Patients were categorized patients into two cohorts based on the first PSA within 3 months after initiation of therapy: PSA reduction ≥50% (Group A) and PSA reduction <50% (Group B).

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Background And Objective: Persistent prostatic specific antigen (PSA) represents a poor prognostic factor for recurrence after radical prostatectomy (RP). However, the impact of persistent PSA on oncologic outcomes in patients undergoing salvage RP is unknown. To investigate the impact of persistent PSA after salvage RP on long-term oncologic outcomes.

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Background: While both seminal vesicle (SVI) and lymph-node invasion (LNI) have been identified as adverse prognostic variables among men undergoing radical prostatectomy (RP), the relative impact of each of these features on subsequent oncologic outcomes has not been well defined. We assessed the impact of LNI on long-term oncologic outcomes among patients with SVI at RP.

Methods: We reviewed 19,519 patients who underwent RP and identified 2043 with SVI.

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Background: Salvage radical prostatectomy (sRP) yields poor functional outcomes and relatively high complication rates. Gleason score (GS) 6 prostate cancer (PCa) has genetic and clinical features showing little, if not absent, metastatic potential. However, the behavior of GS 6 PCa recurring after previous PCa treatment including radiotherapy and/or ablation has not been investigated.

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Background: Lymph node invasion (LNI) represents a poor prognostic factor after primary radical prostatectomy (RP) for prostate cancer (PCa). However, the impact of LNI on oncologic outcomes in salvage radical prostatectomy (SRP) patients is unknown.

Objective: To investigate the impact of lymph node dissection (LND) and pathological lymph node status (pNX vs.

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Purpose: Vesicourethral anastomotic stenosis after radical prostatectomy is a complication with significant adverse quality-of-life implications. Herein, we identify groups at risk for vesicourethral anastomotic stenosis and further characterize the natural history and treatment patterns.

Materials And Methods: Years 1987-2013 of a prospectively maintained radical prostatectomy registry were queried for patients with the diagnosis of vesicourethral anastomotic stenosis, defined as symptomatic and inability to pass a 17F cystoscope.

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