Publications by authors named "Hyeong Dong Yuk"

Introduction: Our team previously reported that elevated carbohydrate antigen (CA) 19-9 levels are associated with a worse prognosis in upper tract urothelial carcinoma (UTUC). Several studies have reported a correlation between high tumor burden and elevated CA19-9 levels in urothelial carcinomas. However, no studies have specifically examined the association between CA19-9 levels and outcomes of patients with bladder cancer who underwent radical cystectomy.

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Purpose: Radical prostatectomy remains the primary treatment for localized prostate cancer (PCa). Despite its use for over two decades, the benefits of robot-assisted radical prostatectomy (RARP) remain unclear. We evaluated the surgical, functional, and oncological outcomes between RARP and open radical retropubic prostatectomy (RRP).

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Purpose: This study aimed to report the real-world outcomes of intravesical gemcitabine for bacillus Calmette-Guérin (BCG) -unresponsive, high-risk, non-muscle-invasive bladder cancer (HR-NMIBC) in Korean patients who were unable or unwilling to undergo radical cystectomy (RC).

Materials And Methods: This retrospective study included 131 patients (median age: 69 years; 89% men) treated with intravesical gemcitabine for BCG-unresponsive HR-NMIBC at nine centers between May 2019 and April 2022. The primary endpoint was 1-year recurrence-free survival (RFS).

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Background: South Korea stands out as a prominent nation relying heavily on living-donor transplants, with a high incidence of living-donor kidney transplants. This study aimed to obtain objective data on the psychological, social, and mental health status of living kidney donors in South Korea.

Methods: A questionnaire was administered to living kidney donors at two tertiary hospitals between June 2020 and November 2020.

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Introduction: We evaluated the prognostic potential of the Beta-human chorionic gonadotropin (β-hCG), Carbohydrate Antigen 19-9 (CA19-9), Cancer Antigen 125 (CA125), and Carcinoembryonic Antigen (CEA) tumor markers for bladder cancer.

Methods: We analyzed the records of 369 patients who underwent radical cystectomy for urothelial cancer (UC) between October 2012 until December 2019. Levels of CA19-9, CA125, CEA, and β-hCG before radical cystectomy were measured in all patient samples, and serum biomarker cutoff values were used as normal and elevated values.

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Background: The effect of anesthesia methods on non-muscle invasive bladder cancer (NMIBC) recurrence post-resection remains uncertain. We aimed to compare the oncological outcomes of spinal anesthesia (SA) and general anesthesia (GA) in patients with NMIBC.

Methods: This prospective randomized controlled trial recruited 287 patients with clinical NMIBC at Seoul National University Hospital from 2018 to 2020.

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Background: To compare the efficacy and toxicity of docetaxel treatment regimens in metastatic castration-resistant prostate cancer (mCRPC).

Methods: We retrospectively analyzed 162 patients diagnosed with mCRPC who underwent docetaxel chemotherapy between 2009 and 2020. The patients were divided into three groups according to the dosage and interval of docetaxel (DCT) chemotherapy regimen: 30 mL/m weekly, 50 mL/m biweekly (every 2 weeks), and 75 mL/m triweekly (every 3 weeks).

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  • * PLGA nanoparticles are commonly used for drug delivery but face challenges in controlling size and release, especially when encapsulating negatively charged nucleic acids.
  • * This study improves nucleic acid encapsulation using negatively charged microbeads, tests a prostate cancer model with PSMA-617-conjugated PLGA nanoparticles, and suggests a novel method for customizing cancer treatments.
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The World Health Organization/International Society of Urological Pathology (WHO/ISUP) grading of renal cell carcinoma (RCC) is classified from grade 1-4, regardless of subtype. The National Comprehensive Cancer Network (NCCN) guidelines (2022) state that if there is an adverse pathological feature, such as grade 3 or higher RCC in stage 1 patients, more rigorous follow-up imaging is recommended. However, the RCC guidelines do not provide specific treatment or follow-up policies by tumor grade.

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Purpose: To investigate if increased tubular damage biomarker can predict pathologically upstaged renal cell carcinoma (RCC), which may possess sub-radiologic invasive behavior, leading to surrounding tubular damage.

Materials And Methods: We examined 1563 patients with surgically resected RCC between March 2016 and June 2021 from the prospective database SUPER-RCC-Nx. Exclusion criteria were cancer not originating from the kidneys, benign renal tumor, and end-stage renal disease.

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  • The study investigates the prognostic significance of lymphatic invasion in prostate cancer, particularly its relationship with biochemical recurrence (BCR) rates in patients who underwent radical prostatectomy (RP) with or without pelvic lymph node dissection (PLND).
  • Researchers analyzed data from 2,207 patients without PLND and 742 with PLND, finding that lymphatic invasion occurred in 3.5% of patients without lymph node metastasis, while 47.6% of patients with metastasis had lymphatic invasion.
  • Results showed that patients with lymphatic invasion had significantly poorer BCR-free survival compared to those without, but there was no notable survival difference between patients with lymphatic invasion and
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  • The study aimed to compare how different types of urinary diversion (ileal conduit vs. neobladder) affect kidney function in patients with a single kidney who had bladder cancer surgery.
  • Researchers assessed kidney function in 86 patients over several months using various methods and found no significant differences in kidney function change between the two urinary diversion types.
  • The results suggest that since urinary diversion type did not affect kidney function, patients with a single kidney might be good candidates for neobladder surgery.
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  • A study was conducted on 743 patients who underwent radical nephroureterectomy (RNUx) for upper tract urothelial carcinoma (UTUC) to assess pyuria as a potential predictor of intravesical recurrence (IVR).
  • Results showed that patients with pyuria had a significantly shorter IVR-free survival rate (49.7%) compared to those without pyuria (60.0%), with pyuria identified as an independent predictor of IVR (HR=1.368).
  • Other factors contributing to IVR risk included concurrent bladder tumors, preoperative ureteroscopy, laparoscopic surgery, tumor multiplicity, and larger tumor size; however, pyuria showed no correlation with
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Traditional tissue-based assessments of genomic alterations in castration-resistant prostate cancer (CRPC) can be challenging. To evaluate the real-world clinical utility of liquid biopsies for the evaluation of genomic alterations in CRPC, we preemptively collected available plasma samples and archival tissue samples from patients that were being treated for clinically confirmed CRPC. The cell-free DNA (cfDNA) and tumor tissue DNA were analyzed using the AlphaLiquid100-HRR panel.

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Background: Clear cell papillary renal cell tumor (CCPRCT) was first reported in 2006 a patient with end stage renal disease. After that it was discovered in the kidney without end stage renal disease in the 2010s and started to be mentioned in pathology and urology. The incidence of CCPRCT is low and most of it is discovered incidentally, so there is a lack of reports on clinical characteristics and surgical outcome.

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Background: Previous studies using the Vesical Imaging Reporting and Data System (VI-RADS) to predict muscle-invasive bladder cancer (MIBC) had some limitations. Most studies were performed with transurethral resection of bladder tumor (TUR-BT) specimens with few samples. This study was conducted to address these shortcomings and confirm the accuracy of VI-RADS for bladder cancer.

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  • This study assesses how urinary retention affects the outcomes of holmium laser enucleation of the prostate (HoLEP) in patients with benign prostatic hyperplasia (BPH) and urinary symptoms.
  • A total of 903 patients were analyzed, with follow-up data showing significant improvements in urinary flow and postvoid residual volumes across groups, both with and without histories of urinary retention.
  • The findings indicate that patients with preoperative acute or chronic urinary retention experience similar enhancements in voiding symptoms and urinary flow after the procedure compared to those without urinary retention.
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Purpose: This study aimed to compare the functional and oncological outcomes of females who underwent uterus-sparing radical cystectomy (USRC) and standard radical cystectomy (SRC).

Materials And Methods: Between February 2009 and December 2020, 90 female patients who underwent radical cystectomy with urinary diversion were included in this study, comprising the USRC and SRC groups. Functional outcomes were assessed in 63 patients who only underwent radical cystectomy with neobladder formation.

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  • The study investigates how pre-operative ipsilateral split renal function (SRF) impacts disease-free survival (DFS) in patients with renal cell carcinoma (RCC) undergoing surgery.
  • Out of 1,078 patients, those with decreased SRF exhibited larger tumor sizes, higher Fuhrman grades, and more aggressive tumor stages.
  • Analysis indicated that decreased SRF was linked to shorter DFS and presented as a significant risk factor alongside high SSIGN scores, suggesting its importance in assessing prognosis for RCC patients.
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Background: Kidney tubular damage markers are biomarkers of acute or chronic kidney injury. Hypothetically, upper tract urothelial cancer (UTUC), which induces obstructive uropathy or direct invasion of the renal parenchyma, may also induce increased excretion of urinary tubular damage proteins. Therefore, this study aimed to investigate the use of tubular damage biomarker as prognostic markers for UTUC.

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Purpose: To assess the prognostic value of acidic urine (low urine pH) in patients with bladder cancer undergoing radical cystectomy.

Materials And Methods: We reviewed patients enrolled in the Seoul National University Prospectively Enrolled Registry for Urothelial Cancer-Cystectomy (SUPER-UC-Cx) who underwent radical cystectomy for bladder cancer between March 2016 and December 2020 at the Seoul National University Hospital. During this period, 368 patients were registered in our database.

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  • Upper tract urothelial carcinoma (UTUC) affects the urothelial cells in the kidney and ureters, and high levels of the tumor marker CA 19-9 are linked to poorer outcomes in cancer patients.
  • A study involving 227 patients from Seoul National University found that elevated CA 19-9 levels correlated with higher tumor burdens and worse prognosis regarding metastasis-free and overall survival.
  • Additionally, after adjusting for variables, CA 19-9 was identified as an independent prognostic factor for UTUC.
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  • This study investigates the causes of high intrarenal pressure (IRP) during minimally invasive surgery for kidney stones, as excessive IRP can lead to complications due to bacteria absorption.* -
  • It analyzed data from 27 patients undergoing mini-PCNL, finding that IRP significantly increased during specific surgical phases like stone fragmentation and upper-pole navigation.* -
  • Factors influencing elevated IRP included baseline pressure, surgical technique, number of stones, and laser settings; the study suggests table tilting may help manage IRP in some cases.*
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Background: Non-muscle invasive bladder cancer can be controlled by transurethral resection of bladder (TURB), but suffers from frequent recurrences in 60-70% of cases. Although, recurrence interval after TURB influences treatment course and prognosis, its implication and risk factors have not been fully elucidated. We evaluated the risk factors of early (within 1 yr) and late (after 1 yr) recurrence of pTa bladder cancer and clinical significance of recurrence interval on disease progression and overall survival.

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  • The study aimed to demonstrate the effectiveness of percutaneous embolization as a treatment for persistent urine leakage following orthotopic neobladder formation, using a mixture of N-butyl cyanoacrylate and lipiodol.
  • Five patients out of 182 who underwent this medical procedure experienced successful resolution of their urine leakage, with a median time of 55 days for closure.
  • Complications were minimal, with two patients developing bladder stones, but overall quality of life scores remained stable throughout the follow-up period.
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