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1.  A clinicogenetic model to predict lymph node invasion by use of genome-based biomarkers from exome arrays in prostate cancer patients 
Korean Journal of Urology  2015;56(2):109-116.
Genetic variations among prostate cancer (PCa) patients who underwent radical prostatectomy (RP) and pelvic lymph node dissection were evaluated to predict lymph node invasion (LNI). Exome arrays were used to develop a clinicogenetic model that combined clinical data related to PCa and individual genetic variations.
Materials and Methods
We genotyped 242,186 single-nucleotide polymorphisms (SNPs) by using a custom HumanExome BeadChip v1.0 (Illumina Inc.) from the blood DNA of 341 patients with PCa. The genetic data were analyzed to calculate an odds ratio as an estimate of the relative risk of LNI. We compared the accuracies of the multivariate logistic model incorporating clinical factors between the included and excluded selected SNPs. The Cox proportional hazard models with or without genetic factors for predicting biochemical recurrence (BCR) were analyzed.
The genetic analysis indicated that five SNPs (rs75444444, rs8055236, rs2301277, rs9300039, and rs6908581) were significant for predicting LNI in patients with PCa. When a multivariate model incorporating clinical factors was devised to predict LNI, the predictive accuracy of the multivariate model was 80.7%. By adding genetic factors in the aforementioned multivariate model, the predictive accuracy increased to 93.2% (p=0.006). These genetic variations were significant factors for predicting BCR after adjustment for other variables and after adding the predictive gain to BCR.
Based on the results of the exome array, the selected SNPs were predictors for LNI. The addition of individualized genetic information effectively enhanced the predictive accuracy of LNI and BCR among patients with PCa who underwent RP.
PMCID: PMC4325114
Exome; Genotype; Lymph nodes; Predictive value of tests; Prostate neoplasms
2.  Renal cryoablation of small renal masses: A Korea University experience 
Korean Journal of Urology  2015;56(2):117-124.
To evaluate the perioperative, functional, and oncological outcomes of renal cryoablation (RC) of small renal masses (SRMs) performed in Korea University Hospital.
Materials and Methods
We reviewed an Institutional Review Board-approved database of 70 patients who underwent RC and were followed up for a minimum of 3 months by a single surgeon in Korea University Hospital from August 2007 to May 2014. Among these patients, 68 patients (79 renal masses) were enrolled in our research. We evaluated perioperative, functional, and oncologic outcomes of RC.
A total of 68 patients (79 renal masses) underwent RC in our institution. The mean age of the patients was 62.0 years. The mean tumor size was 2.25 cm. Among the 59 patients who underwent laparoscopic surgery, only 1 patient (1.47%) was converted to open surgery. No other perioperative complications occurred. The mean preoperative and 1-month postoperative estimated glomerular filtration ratio (eGFR) were 71.8 and 68.3 mL/min/1.73 m2, respectively (p=0.19). The mean 1-year postoperative eGFR was 65.0 mL/min/1.73 m2 (p=0.25). The mean follow-up period was 59.76 months (range, 3-119 months). Local tumor recurrence occurred in eight tumors (15.4%; a total of 52 renal cell carcinomas). Concerning treatment in the patients with recurrence, five patients underwent re-treatment and three patients are under active surveillance. None of the eight patients who experienced local recurrence had additional recurrence or tumor progression during the follow-up period. In our study, the recurrence-free rate was 83.0% and the cancer-specific survival rate was 100%. Moreover, the 5- and 10-year overall survival rates were both 100%.
Long-term experience with RC in our institution demonstrates that RC is a safe and effective treatment for patients with SRMs.
PMCID: PMC4325115
Complementary therapies; Cryosurgery; Kidney neoplasms
3.  Lessons learnt in the management of primary invasive penile cancer in an Australian tertiary referral centre: Clinical outcomes with a minimum 48 months follow-up study 
Korean Journal of Urology  2015;56(2):125-130.
To report on lessons learnt in the management of primary invasive penile cancer in a major tertiary hospital in Australia.
Materials and Methods
Medical records for all patients who underwent surgery for primary invasive penile cancer between January 2000 and January 2011 were obtained. Patient demographics, clinical status of inguinal node, cancer stage and clinical outcomes were reviewed. All patients were followed up for a minimum of 48 months postoperative unless patient deceased within the first 48 months from the time of penile cancer surgery.
Over the 11-year period, a total of 23 cases of invasive penile cancer were identified. Partial penectomy was the most common form of organ preserving surgery and the majority of patients have pT1b disease. Of the 9 patients with clinically palpable inguinal nodes, 7 patients were diagnosed with pN3 disease following inguinal lymphadenectomy. The Kaplan-Meier cancer-specific survival at 72 months showed decreasing survival based on tumour stage (83% in pT1, 79% in pT2, and 64% in pT3 disease) and nodal disease (100% in node negative, 50% in superficial inguinal lymphadenopathy, and 38% in patients with deep inguinal and/or pelvic lymphadenopathy) (p=0.082). The Kaplan-Meier cancer-specific survival revealed statistically significant difference in survival outcome in patients with local recurrence vs. systemic metastasis disease (33% vs. 17%, p=0.008).
The presence of high risk features such as tumour stage, lymph node involvement and distant metastasis carries a significant higher risk of death and tumour recurrence in patients with penile cancer and inguinal lymph node metastasis.
PMCID: PMC4325116
Penile neoplasms; Survival; Treatment outcome
4.  Robotic or open radical prostatectomy after previous open surgery in the pelvic region 
Korean Journal of Urology  2015;56(2):131-137.
We sought to evaluate the feasibility and safety of open or robotic radical prostatectomy (RP) after rectum, sigmoid, or colon surgery.
Materials and Methods
Sixty-four patients with a median age of 65 years (range, 46-73 years) who underwent RP after previous pelvic surgery were included. Twenty-four patients (38%) underwent robotic RP and 40 patients (62%) underwent open RP. Bilateral lymph node dissection and nerve preservation were performed in 50 patients (78%) and 35 patients (55%), respectively. Variables evaluated included demographic characteristics, perioperative complications, and functional and oncological outcomes. The median hospitalization and follow-up periods were 2 days (range, 1-12 days) and 21 months (range, 1-108 months), respectively.
No conversions from robotic to open surgery were performed and there were no intraoperative complications. Surgical margins were positive in 13 patients (20%), seminal vesicle involvement was detected in 6 patients (9%), and lymph node involvement was found in 2 patients (3%). Postoperative complications included lymphocele in 1 patient, urethral stricture in 1 patient, and bowel obstruction and persistent bladder leakage in 2 patients. Eighty-eight percent of the patients were continent at 7 months and 80% of patients were able to achieve erection with or without medical aid.
Open or robotic RP can be done safely and effectively in patients who have previously undergone pelvic surgery. Although prior pelvic surgery of the large intestine was associated with increased morbidity, it should not be considered a contraindication for robotic or open RP.
PMCID: PMC4325117
Prostate; Prostate neoplasms; Prostatectomy; Robotics; Surgery
5.  Predictive factors for flexible ureterorenoscopy requirement after rigid ureterorenoscopy in cases with renal pelvic stones sized 1 to 2 cm 
Korean Journal of Urology  2015;56(2):138-143.
To evaluate the outcomes of rigid ureterorenoscopy (URS) for renal pelvic stones (RPS) sized 1 to 2 cm and to determine the predictive factors for the requirement for flexible URS (F-URS) when rigid URS fails.
Materials and Methods
A total of 88 patients were included into the study. In 48 patients, the RPS were totally fragmented with rigid URS and F-URS was not required (group 1). In 40 patients, rigid URS was not able to access the renal pelvis or fragmentation of the stones was not completed owing to stone position or displacement and F-URS was utilized for retrograde intrarenal surgery (RIRS) (group 2). The predictive factors for F-URS requirement during RIRS for RPS were evaluated. Both groups were compared regarding age, height, sex, body mass index, stone size, stone opacity, hydronephrosis, and previous treatments.
The mean patient age was 48.6±16.5 years and the mean follow-period was 39±11.5 weeks. The overall stone-free rate in the study population was 85% (75 patients). In groups 1 and 2, the overall stone-free rates were 83% (40 patients) and 87% (35 patients), respectively (p>0.05). The independent predictors of requirement for F-URS during RIRS were male gender, patient height, and higher degree of hydronephrosis.
Rigid URS can be utilized in selected patients for the fragmentation of RPS sized 1 to 2 cm with outcomes similar to that of F-URS. In case of failure of rigid URS, F-URS can be performed successfully in this group of patients.
PMCID: PMC4325118
Kidney pelvis; Ureteroscopy; Urolithiasis
6.  Efficacy of scrotal Doppler ultrasonography with the Valsalva maneuver, standing position, and resting-Valsalva ratio for varicocele diagnosis 
Korean Journal of Urology  2015;56(2):144-149.
To determine effectiveness of Valsalva maneuver and standing position on scrotal color Doppler ultrasound (CDU) for the varicocele diagnosis.
Materials and Methods
We reviewed the physical examination and CDU finding in 87 patients who visited National Police Hospital from January 2011 to April 2014. Diameters of pampiniform plexus were measured bilaterally during resting and Valsalva maneuver in the supine position and standing position. We calculated the ratio of mean of maximal vein diameter (mMVD) during resting and Valsalva maneuver (resting-Valsalva ratio) and compared in the both position.
In the resting and supine position, mMVD of varicocele testis units were 1.8 mm, 2.1 mm, 2.6 mm (grades I, II, III, respectively), and that of normal testis units (NTU) 1.2 mm. During Valsalva maneuver in the supine position, mMVD were 3.0 mm, 3.4 mm, 4.2 mm (grades I, II, III) vs 1.8 mm (NTU) (p=0.007, p<0.001, p<0.001, respectively). Average of resting-Valsalva ratio in the supine position were 0.69, 0.74, 0.74 (grades I, II, III) and 0.67 (NTU). Whereas in the resting and standing position, mMVD were 2.8 mm, 3.3 mm, 3.8 mm (grades I, II, III) and 1.8 mm (NTU) (p=0.002, p<0.001, p<0.001). During Valsalva maneuver in the standing position, mMVD were 5.0 mm, 5.8 mm, 6.6 mm (grades I, II, III) and 2.5 mm (NTU) (p=0.002, p<0.001, p<0.001). And average resting-Valsalva ratio were 0.76, 0.90, 0.71 (grades I, II, III) and 0.26 (NTU), which showed significant differences from all grades (p<0.001, p<0.001, p<0.001).
It is suggested that the standing position and Valsalva maneuver during CDU could improve diagnostic ability for varicocele. Resting-Valsalva ratio in the standing position could be a new diagnostic index for varicocele diagnosis using CDU.
PMCID: PMC4325119
Doppler ultrasonography; Valsalva maneuver; Varicocele
7.  Evaluation of holmium laser for transurethral deroofing of severe and multiloculated prostatic abscesses 
Korean Journal of Urology  2015;56(2):150-156.
Our objective was to evaluate the use of a holmium laser for transurethral deroofing of a prostatic abscess in patients with severe and multiloculated prostatic abscesses.
Materials and Methods
From January 2011 to April 2014, eight patients who were diagnosed with prostatic abscesses and who underwent transurethral holmium laser deroofing at Pusan National University Hospital were retrospectively reviewed.
Multiloculated or multifocal abscess cavities were found on the preoperative computed tomography (CT) scan in all eight patients. All patients who underwent transurethral holmium laser deroofing of a prostatic abscess had successful outcomes, without the need for secondary surgery. Of the eight patients, seven underwent holmium laser enucleation of the prostate (HoLEP) for the removal of residual adenoma. Markedly reduced multiloculated abscess cavities were found in the follow-up CT in all patients. No prostatic abscess recurrence was found. Transient stress urinary incontinence was observed in three patients. The stress urinary incontinence subsided within 3 weeks in two patients and improved with conservative management within 2 months in the remaining patient.
Transurethral holmium laser deroofing of prostatic abscesses ensures successful drainage of the entire abscess cavity. Because we resolved the predisposing conditions of prostatic abscess, such as bladder outlet obstruction and prostatic calcification, by simultaneously conducting HoLEP, there was no recurrence of the prostatic abscesses after surgery. We recommend our method in patients requiring transurethral drainage.
PMCID: PMC4325120
Abscess; Holmium; Prostate; Transurethral resection of prostate
8.  Delayed redo pyeloplasty fails to recover lost renal function after failed pyeloplasty: Early sonographic changes that correlate with a loss of differential renal function 
Korean Journal of Urology  2015;56(2):157-163.
To evaluate changes in differential renal function (DRF), as a functional outcome, in children who underwent redo pyeloplasty for management of failed pyeloplasty and to examine the factors that affect functional outcomes.
Materials and Methods
Between January 2002 and November 2010, a total of 18 patients who underwent redo pyeloplasty for persistent ureteropelvic junction obstruction after failed pyeloplasty were enrolled in this study. We assessed perioperative factors and evaluated changes in renal cortical thickness (RCT), renal function, and hydronephrosis by use of serial ultrasound and diuretic renography.
The mean follow-up period was 44.83±28.86 months. After redo pyeloplasty, prevention of further functional deterioration was observed in only 12 of the 18 patients. After dividing the patients according to this observation, we discovered significant differences in both change in DRF (dDRF) and change in RCT (dRCT) (difference between before and after initial pyeloplasty) between the two groups (p<0.001). Additionally, we noted a significant positive correlation between dRCT and dDRF. All patients showed improvements in hydronephrosis grade and relief of symptoms compared with before redo pyeloplasty.
Redo pyeloplasty should be considered in cases of failed pyeloplasty to preserve renal function and obtain relief from symptoms. If patients show severe deterioration of DRF or a decrease in RCT after initial pyeloplasty, preservation of DRF in these patients after redo pyeloplasty could be difficult. Therefore, redo pyeloplasty should be performed before severe deterioration of DRF or decrease in RCT.
PMCID: PMC4325121
Hydronephrosis; Radioisotope renography; Treatment failure
9.  Ventral inlay buccal mucosal graft urethroplasty: A novel surgical technique for the management of urethral stricture disease 
Korean Journal of Urology  2015;56(2):164-167.
To describe the novel technique of ventral inlay substitution urethroplasty for the management of male anterior urethral stricture disease. A 58-year-old gentleman with multifocal bulbar stricture disease measuring 7 cm in length was treated using a ventral inlay substitution urethroplasty. A dorsal urethrotomy was created, and the ventral urethral plated was incised. The edges of the urethral plate were mobilized without violation of the ventral corpus spongiosum. A buccal mucosa graft was harvested and affixed as a ventral inlay to augment the caliber of the urethra. The dorsal urethrotomy was closed over a foley catheter. No intraoperative or postoperative complications occurred. Postoperative imaging demonstrated a widely patent urethra. After three years of follow-up, the patient continues to do well with no voiding complaints and low postvoid residuals. Ventral inlay substitution urethroplasty appears to be a safe and feasible technique for the management of bulbar urethral strictures.
PMCID: PMC4325122
Buccal mucosa; Reconstructive surgical procedure; Urethral stricture
10.  Next generation sequencing and urologic cancer 
Korean Journal of Urology  2015;56(2):87-89.
PMCID: PMC4325123
11.  Clinically relevant genetic characterization of prostate tumors: How close are we to the goal? 
Korean Journal of Urology  2015;56(2):90-98.
Substantial efforts are being made in research on the molecular genetic characterization of prostate cancer. The number of fundamental research programs in prostate cancer molecular biology and genetics is overwhelming. However, a significant gap appears to exist between the huge number of studies on the genetic characterization of prostate cancer, which often have limited translation into clinical practice or simply were not conceived to be so translated, and clinical practice. From a clinical point of view, this balance should be urgently shifted towards rapid translation into urological practice. However, prostate cancer is characterized by prominent genetic heterogeneity, which could be a very difficult barrier to overcome. In this review, we discuss the possible clinical applications of scientific data from fundamental studies of prostate cancer genetics, the main problems with the translation of these data to clinics, and future perspectives.
PMCID: PMC4325124
Biological markers; Molecular biology; Prostate neoplasms; Translations
12.  Current status of penile rehabilitation after radical prostatectomy 
Korean Journal of Urology  2015;56(2):99-108.
Although disease-free survival remains the primary goal of prostate cancer treatment, erectile dysfunction (ED) remains a common complication that affects the quality of life. Even though several preventive and therapeutic strategies are available for ED after radical prostatectomy (RP), no specific recommendations have been made on the optimal rehabilitation or treatment strategy. Several treatment options are available, including phosphodiesterase-5 inhibitors, vacuum erection devices, intracavernosal or intraurethral prostaglandin injections, and penile prostheses. Urologists must consider more effective ways to establish optimal treatments for ED after RP. ED is an important issue among patients with prostate cancer, and many patients hope for early ED recovery after surgery. This review highlights the currently available treatment options for ED after RP and discusses the limitations of each.
PMCID: PMC4325125
Erectile dysfunction; Penis erection; Prostatectomy
13.  Report of the Korean Journal of Urology Editorial Board Meeting 2014 
Korean Journal of Urology  2014;55(12):773-774.
PMCID: PMC4265709  PMID: 25512809
14.  Medical and Dietary Therapy for Kidney Stone Prevention 
Korean Journal of Urology  2014;55(12):775-779.
The prevalence of kidney stone disease is increasing, and newer research is finding that stones are associated with several serious morbidities. These facts suggest that emphasis needs to be placed not only on stone treatment but also stone prevention. However, there is a relative dearth of information on dietary and medical therapies to treat and avoid nephrolithiasis. In addition, studies have shown that there are many misconceptions among both the general community and physicians about how stones should be managed. This article is meant to serve as a review of the current literature on dietary and drug therapies for stone prevention.
PMCID: PMC4265710  PMID: 25512810
Diet therapy; Drug therapy; Kidney calculi; Nephrolithiasis
15.  Current Status of Cryotherapy for Prostate and Kidney Cancer 
Korean Journal of Urology  2014;55(12):780-788.
In terms of treating diseases, minimally invasive treatment has become a key element in reducing perioperative complications. Among the various minimally invasive treatments, cryotherapy is often used in urology to treat various types of cancers, especially prostate cancer and renal cancer. In prostate cancer, the increased incidence of low-risk, localized prostate cancer has made minimally invasive treatment modalities an attractive option. Focal cryotherapy for localized unilateral disease offers the added benefit of minimal morbidities. In renal cancer, owing to the increasing utilization of cross-sectional imaging, nearly 70% of newly detected renal masses are stage T1a, making them more susceptible to minimally invasive nephron-sparing therapies including laparoscopic and robotic partial nephrectomy and ablative therapies. This article reviews the various outcomes of cryotherapy compared with other treatments and the possible uses of cryotherapy in surgery.
PMCID: PMC4265711  PMID: 25512811
Cryotherapy; Kidney; Neoplasm; Prostate
16.  Overview of Pediatric Testicular Tumors in Korea 
Korean Journal of Urology  2014;55(12):789-796.
Prepubertal testicular tumors are rare compared with postpubertal testicular tumors. The incidence of prepubertal testicular tumors peaks at 2 years of age, tapers off after 4 years of age, and then begins to rise again at puberty. Prepubertal and postpubertal testicular tumors show many differences, including the typical tumor histology, molecular biological differences, and the malignant potential of tumors at different ages. Pediatric testicular tumors are classified as benign or malignant on the basis of their clinical behavior and histologically are divided into germ cell and gonadal stromal (nongerm cell) tumors. Many histological and biological studies have further confirmed the distinct nature of prepubertal and postpubertal testicular tumors. These differences have led to various management strategies for prepubertal and postpubertal tumors. Because overall about 75% of prepubertal testicular tumors are benign, a testis-sparing approach is becoming more common in children. Orchiectomy and observation with very selective use of chemotherapy has become the standard approach when a malignant tumor is identified. Retroperitoneal lymph node dissection and radiation therapy play very limited roles.
PMCID: PMC4265712  PMID: 25512812
Child; Pediatrics; Testicular germ cell tumor; Testicular neoplasms
17.  Histologic Variability and Diverse Oncologic Outcomes of Prostate Sarcomas 
Korean Journal of Urology  2014;55(12):797-801.
Primary prostate sarcomas are a rare type of prostate cancer that account for less than 0.1% of primary prostate malignancies. We analyzed the experience of a single institution with prostate sarcoma over 20 years.
Materials and Methods
In this case series, the medical records of 20 patients with prostate sarcoma were reviewed from June 1990 to December 2013 to identify symptoms at presentation, diagnostic procedures, metastasis presence and development, histologic subtype, French Fédération Nationale des Centres de Lutte Contre le Cancer grade, primary tumor grade and size, and treatment sequence, including surgery and preoperative and postoperative therapies. The average follow-up period was 23.6 months (range, 1.4-83.3 months).
The average patient age was 46.3±16.7 years. Most patients presented with lower urinary tract symptoms (55%). The histologic subtype was spindle cell sarcoma in five patients (25%), rhabdomyosarcoma in three patients (15%), synovial sarcoma in three patients (15%), liposarcoma in three patients (15%), stromal sarcoma in three patients (15%), and Ewing sarcoma, nerve sheath tumor, and adenocarcinoma with sarcomatoid component (5% each). For liposarcoma, two patients were alive after complete surgical resection and had a good prognosis. At last follow-up, 15 patients had died of sarcoma. The 2- and 5-year actuarial survival rates for all 20 patients were 53% and 12%, respectively (medial survival, 20 months).
The disease-specific survival rate of prostate sarcoma is poor. However, sarcoma that is detected early shows a better result with proper management including surgical intervention with radio-chemotherapy than with no treatment. Early diagnosis and complete surgical resection offer patients the best curative chance.
PMCID: PMC4265713  PMID: 25512813
Liposarcoma; Prostate; Rhabdomyosarcoma; Sarcoma
18.  Location of Positive Surgical Margin and Its Association With Biochemical Recurrence Rate Do Not Differ Significantly in Four Different Types of Radical Prostatectomy 
Korean Journal of Urology  2014;55(12):802-807.
To analyze the location of the positive surgical margin (PSM) and its association with the biochemical recurrence (BCR) rate in cases of radical prostatectomy (RP) according to the type of surgery.
Materials and Methods
We retrospectively analyzed 1,880 cases of RP. Baseline characteristics were analyzed. Locations of the PSM were recorded in the four surgery groups as apex, anterior, posterolateral, and base and were analyzed by using chi-square test. The association of the location of the PSM with the BCR rate was analyzed by using Kaplan-Meier survival analysis according to the type of surgery, which included radical perineal prostatectomy (RPP, n=633), radical retroperitoneal prostatectomy (RRP, n=309), laparoscopic radical prostatectomy (LRP, n=164), and robot-assisted laparoscopic radical prostatectomy (RALRP, n=774).
A PSM was found in a total of 336 cases (18%): 122 cases of RPP (18%), 67 cases of RRP (17%), 29 cases of LRP (17%), and 119 cases of RALRP (15%). The PSM rate did not differ significantly by surgical type (p=0.142). The location of the PSM was the apex in 136 cases (7.2%), anterior in 67 cases (3.5%), posterolateral in 139 cases (7.3%), and base in 95 cases (5.0%), and showed no significant difference according to surgical type (p=0.536, p=0.557, p=0.062, and p=0.109, respectively). The BCR rate according to the location of the PSM did not differ significantly for the four types of surgery (p=0.694, p=0.301, p=0.445, and p=0.309 for RPP, RRP, LRP, and RALRP, respectively).
The location of the PSM seemed to be unrelated to type of RP. There was no significant correlation between the BCR rate and the location of the PSM for any of the RP types.
PMCID: PMC4265714  PMID: 25512814
Operative surgical procedures; Prostate; Prostate neoplasms; Prostatectomy; Recurrence
19.  Comparison of Perioperative Outcomes of Robotic Versus Laparoscopic Partial Nephrectomy for Complex Renal Tumors (RENAL Nephrometry Score of 7 or Higher) 
Korean Journal of Urology  2014;55(12):808-813.
To compare the perioperative outcomes of laparoscopic partial nephrectomy (LPN) and robotic partial nephrectomy (RPN) for moderately or highly complex tumors (RENAL nephrometry score≥7).
Materials and Methods
A retrospective analysis was performed for 127 consecutive patients who underwent either LPN (n=38) or RPN (n=89) between 2007 and 2013. Perioperative outcomes were compared.
There were no significant differences between the two groups with respect to patient gender, laterality, RENAL nephrometry score, or body mass index. The RPN group had a slightly higher RENAL nephrometry score (7.8 vs. 7.5, p=0.061) and larger tumor size (3.0 cm vs. 2.5 cm, p=0.044) but had a lower Charlson comorbidity index (3.7 vs. 4.4, p=0.017) than did the LPN group. There were no significant differences with respect to warm ischemia time, estimated blood loss, intraoperative complications, or operative time. Only one patient who underwent LPN had a positive surgical margin. There were statistically significant differences in surgical marginal width between the LPN and RPN groups (0.6 cm vs. 0.4 cm, p=0.001). No significant differences in postoperative complications were found between the two groups. Owing to potential baseline differences between the two groups, we performed a propensity-based matching analysis, in which differences in surgical margin width between the LPN and RPN groups remained statistically significant (0.6 cm vs. 0.4 cm, p=0.029).
RPN provides perioperative outcomes comparable to those of LPN and has the advantage of healthy parenchymal preservation for complex renal tumors (RENAL score≥7).
PMCID: PMC4265715  PMID: 25512815
Laparoscopy; Nephrectomy; Renal cell carcinoma; Robotics
20.  Impact of Metabolic Syndrome on Response to Medical Treatment of Benign Prostatic Hyperplasia 
Korean Journal of Urology  2014;55(12):814-820.
To investigate the effect of metabolic syndrome (MetS) on the response to medical therapy of benign prostatic hyperplasia (BPH) after a 3-month period of treatment.
Materials and Methods
This was a cohort study of 100 patients, 47 with MetS and 53 without MetS, referred to either the primary care unit or referral hospital with BPH who had moderate lower urinary tract symptoms of prostate involvement and were candidates for medical treatment. Our main outcome was response to medical treatment with prazosin 1 mg twice a day and finasteride 5 mg daily in patients with BPH on the basis of International Prostate Symptom Score (IPSS). Multivariate analysis of covariance was used to compare BPH treatment response in patients with and without MetS before and after receiving treatment.
The mean volume of the prostate was significantly higher in MetS patients than in patients without MetS (57±32.65 mL compared with 46.00±20.19 mL, p=0.036). The control group demonstrated an 11-unit reduction in IPSS, whereas those with MetS showed a reduction in the symptom score of only 6 units (p<0.001). Regarding the components of MetS separately, triglyceride (p<0.001), fasting blood sugar (p=0.001), and waist circumference (p=0.028) significantly affected the clinical progression of BPH. The observational nature of this study may be a limitation in comparison with an interventional study.
The results of the present study showed that MetS can negatively affect the response to medical treatment of BPH. Therefore, it is necessary to consider MetS in selecting patients with BPH for drug therapy.
PMCID: PMC4265716  PMID: 25512816
Finasteride; Lower urinary tract symptoms; Metabolic syndrome X; Prazosin; Prostatic hyperplasia
21.  Does Preoperative Urodynamic Testing Improve Surgical Outcomes in Patients Undergoing the Transobturator Tape Procedure for Stress Urinary Incontinence? A Prospective Randomized Trial 
Korean Journal of Urology  2014;55(12):821-827.
Urodynamic studies are commonly performed as part of the preoperative work-up of patients undergoing surgery for stress urinary incontinence (SUI). We aimed to assess the extent to which these urodynamic parameters influence patient selection and postoperative outcomes.
Materials and Methods
Patients presenting with SUI were randomly assigned to two groups: one undergoing office evaluation only and the other with a preoperative urodynamic work-up. Patients with unfavorable urodynamic parameters (detrusor overactivity [DO] and/or Valsalva leak point pressure [VLPP]<60 cm H2O and/or maximum urethral closure pressure [MUCP]<20 cm H2O) were excluded from the urodynamic testing group. All patients in both groups underwent the transobturator midurethral sling procedure. Evaluation for treatment success (reductions in urogenital distress inventory and incontinence impact questionnaire scoring along with absent positive stress test) was done at 6 months and 1 year postoperatively.
A total of 72 patients were evaluated. After 12 patients with any one or more of the abnormal urodynamic parameters were excluded, 30 patients were finally recruited in each of the "urodynamic testing" and "office evaluation only" groups. At both the 6- and the 12-month follow-ups, treatment outcomes (reduction in scores and positive provocative stress test) were significantly better in the urodynamic testing group than in the office evaluation only group (p-values significant for all outcomes).
Our findings showed statistically significantly better treatment outcomes in the urodynamic group (after excluding those with poor prognostic indicators such as DO, low VLPP, and MUCP) than in the office evaluation only group. We recommend exploiting the prognostic value of these urodynamic parameters for patient counseling and treatment decisions.
PMCID: PMC4265717  PMID: 25512817
Urinary incontinence; Urodynamics
22.  Efficacy, Tolerability, and Safety of Oxybutynin Chloride in Pediatric Neurogenic Bladder With Spinal Dysraphism: A Retrospective, Multicenter, Observational Study 
Korean Journal of Urology  2014;55(12):828-833.
Anticholinergics are a key element in treating neurogenic detrusor overactivity, but only limited data are available in the pediatric population, thus limiting the application to children even for oxybutynin chloride (OC), a prototype drug. This retrospective study was designed to provide data regarding the efficacy, tolerability, and safety of OC in the pediatric population (0-15 years old) with spinal dysraphism (SD).
Materials and Methods
Records relevant to OC use for neurogenic bladder were gathered and scrutinized from four specialized clinics for pediatric urology. The primary efficacy outcomes were maximal cystometric capacity (MCC) and end filling pressure (EFP). Data on tolerability, compliance, and adverse events (AEs) were also analyzed.
Of the 121 patient records analyzed, 41 patients (34%) received OC at less than 5 years of age. The range of prescribed doses varied from 3 to 24 mg/d. The median treatment duration was 19 months (range, 0.3-111 months). Significant improvement of both primary efficacy outcomes was noted following OC treatment. MCC increased about 8% even after adjustment for age-related increases in MCC. Likewise, mean EFP was reduced from 33 to 21 cm H2O. More than 80% of patients showed compliance above 70%, and approximately 50% of patients used OC for more than 1 year. No serious AEs were reported; constipation and facial flushing consisted of the major AEs.
OC is safe and efficacious in treating pediatric neurogenic bladder associated with SD. The drug is also tolerable and the safety profile suggests that adjustment of dosage for age may not be strictly observed.
PMCID: PMC4265718  PMID: 25512818
Child; Neurogenic urinary bladder; Oxybutynin
23.  Tumor-Specific Immunity Induced by Cryoablation in a Murine Renal Cell Carcinoma Model 
Korean Journal of Urology  2014;55(12):834-840.
To evaluate tumor-specific immunity and define the mechanisms involved in the cryoimmunologic response, we compared the tumor control efficacy and immunologic responses of cryoablation with those of surgical excision in a tumor rechallenge model.
Materials and Methods
Sixty BALB/c mice with RENCA tumors that were generated in the left flank area underwent cryoablation or radical excision. The mice successfully treated were rechallenged with RENCA or an undifferentiated colon carcinoma cell line, CT26, in the contralateral right flank area. The recurrence rate after tumor rechallenge in each group was then observed. To assess the immunologic response of each treatment modality, fluorescent-activated cell sorting (FACS) analysis and a cytotoxicity assay using 51Cr release were performed.
After reinoculation of the RENCA cells, the rate of tumor growth was significantly higher in the surgical excision group than in the cryoablation group (94.4% vs. 11.1%, p=0.001). In the cryoablation group, the tumor growth rate was significantly increased after rechallenge of CT26 cells compared with RENCA (94.1% vs. 11.1%, p=0.001). The cryoablation group showed an elevated CD3, CD4, CD8 T, and natural killer cell count in the FACS analysis and also showed significantly increased cytotoxicity in the 51Cr release assay compared with the excision group.
These results showed that cryoablation, compared to surgical resection, was more effective in preventing tumor growth after rechallenge with RENCA cells and that this response was tumor-specific, because the CT26 cells did not have the same effect.
PMCID: PMC4265719  PMID: 25512819
Animal models; Cryosurgery; Immunity; Renal cell carcinoma
24.  Reconstruction of an Amputated Glans Penis With a Buccal Mucosal Graft: Case Report of a Novel Technique 
Korean Journal of Urology  2014;55(12):841-843.
Penile amputation is a rare catastrophe and a serious complication of circumcision. Reconstruction of the glans penis may be indicated following amputation. Our report discusses a novel technique for reconfiguration of an amputated glans penis 1 year after a complicated circumcision. A 2-year-old male infant presented to us with glans penis amputation that had occurred during circumcision 1 year previously. The parents complained of severe meatal stenosis with disfigurement of the penis. Penis length was 3 cm. Complete penile degloving was performed. The distal part of the remaining penis was prepared by removing fibrous tissue. A buccal mucosal graft was applied to the distal part of the penis associated with meatotomy. The use of a buccal mucosal graft is a successful and simple procedure with acceptable cosmetic and functional results for late reconfiguration of the glans penis after amputation when penile size is suitable.
PMCID: PMC4265720  PMID: 25512820
Amputation; Mouth mucosa; Penis
25.  Radiofrequency-Treated Recurrence of Urothelial Carcinoma of the Upper Urinary Tract After Nephroureterectomy 
Korean Journal of Urology  2014;55(12):844-846.
Local recurrence after radical nephroureterectomy (RNU) owing to urothelial carcinoma of the upper urinary tract is rare. The usual treatment is systemic chemotherapy followed by optional resection of the mass. We introduce the case of a 73-year-old male patient with multiple comorbidities in whom retroperitoneal carcinoma recurrence of 31 mm was diagnosed via positron emission tomography-computed tomography scan with 18-fluorodeoxyglucose about 5 years after he had undergone RNU owing to urothelial carcinoma of the upper urinary tract. The patient was treated with computed tomography-guided percutaneous radiofrequency ablation. Later scans with contrast controls showed lack of contrast uptake and a decrease of the lesion's size. Twenty-four months after the procedure, the patient is free of the disease. To date, this is the first case of recurrence of urothelial carcinoma that was treated with percutaneous radiofrequency ablation, thus establishing an alternative to chemotherapy in patients with substantial comorbidities.
PMCID: PMC4265721  PMID: 25512821
Local neoplasm recurrence; Radiofrequency catheter ablation; Transitional cell carcinoma

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