Patient characteristics correlate with diagnostic performance of photodynamic diagnostic assisted transurethral resection of bladder tumors: A retrospective, single-center study.

BACKGROUND: Identification of patient subclasses that correlate with the diagnostic performance of photodynamic diagnostic (PDD)-assisted transurethral resection of bladder tumors (TURBT) may improve outcomes. METHODS: Data were extracted from patients that underwent PDD-assisted TURBT at the University of Tsukuba Hospital between 2018 and 2023. Sensitivity and specificity were evaluated based on PDD findings (excluding WL findings) and pathology results. Cluster analysis using uniform manifold approximation and projection and k-means methods was performed, focusing on patients with malignant lesions. RESULTS: A total of 267 patients and 2082 specimens were extracted. Sensitivity was lowest with regard to BCG treatment (53.7 %), followed by flat lesions (57.2 %), urine cytology class ≥ III (62.9 %), and recurrent tumors (64.5 %). In the cluster analysis of 231 patients with malignant lesions, two showed lower sensitivity: Cluster 3 (62.4 %), consisting of patients with recurrent tumors and post-BCG treatment, and Cluster 4 (55.7 %), consisting of patients with primary tumors and urine cytology class ≥ III. Clusters 1 and 2, consisting of patients without BCG treatment and patients with lower urine cytology classes, exhibited higher sensitivities (94.4 % and 87.7 %). Among all clusters, Cluster 4 had the highest proportion of specimens which were negative for both PDD and white light (WL) findings but actually had malignant lesions (20.8 %). CONCLUSIONS: PDD-assisted TURBT sensitivity was lower in subclasses after BCG treatment or with cytology class III or higher. Random biopsy for PDD/WL double-negative lesions may improve diagnostic accuracy in these subclasses.

Adult genitourinary sarcoma: analysis using hospital-based cancer registry data in Japan.

BACKGROUND: Genitourinary sarcomas are rare in adults and few large-scale studies on adult genitourinary sarcoma are reported. We aimed to elucidate the clinical characteristics, survival outcomes, and prognostic factors for overall survival of adult genitourinary sarcoma in Japan. METHODS: A hospital-based cancer registry data in Japan was used to identify and enroll patients diagnosed with genitourinary sarcoma in 2013. The datasets were registered from 121 institutions. RESULTS: A total of 116 men and 39 women were included, with a median age of 66 years. The most common primary site was the kidney in 47 patients, followed by the paratestis in 36 patients. The most common histological type was liposarcoma in 54 patients, followed by leiomyosarcoma in 25 patients. The 5-year overall survival rates were 57.6%. On univariate analysis, male gender, paratestis as primary organ, and histological subtype of liposarcoma were predictive of favorable survival while primary kidney, bladder, or prostate gland location were predictive of unfavorable survival. On multivariate analysis, primary paratestis was an independent predictor of favorable survival while primary kidney, bladder, or prostate gland were independent predictors of unfavorable survival. CONCLUSIONS: This is the first report showing the clinical characteristics and survival outcomes of adult genitourinary sarcoma in Japan using a real-world large cohort database.

The prognostic impact of treatment centralization in patients with testicular germ cell tumors: analysis of hospital-based cancer registry data in Japan.

BACKGROUND: To identify the prognostic impact of treatment centralization in patients with testicular germ cell tumors (TGCT). METHODS: We used a hospital-based cancer registry data in Japan to extract seminoma and non-seminoma cases that were diagnosed in 2013, histologically confirmed, and received the first course of treatment. To compare the 5-years overall survival (OS) rates of patients stratified by institutional care volume, we performed a Cox proportional hazards regression analysis using inverse probability of treatment weighting (IPTW) method to adjust patient backgrounds. RESULTS: A total of 1767 TGCT patients were identified. The 5-years OS rates for stage II and III TGCT patients treated at low-volume institutions (< 7 cases) were significantly worse than high-volume institutions (≥ 7 cases) (91.2% vs. 83.4%, p = 0.012). Histological stratification revealed that 5-year OS rates for stage II and III seminoma patients in the low-volume group were significantly worse than the high-volume group (93.5% vs. 84.5%, p = 0.041). Multivariate OS analysis using an IPTW-matched cohort showed that institutional care volume was an independent prognostic factor (hazard ratio 2.13 [95% confidence interval: 1.23-3.71], p = 0.0072). CONCLUSION: Our results indicate that stage II and III TGCT patients experience lower survival rates at low-volume institutions and would benefit from treatment centralization.

Plasma circulating tumor DNA profiling in patients with chemo-refractory germ cell tumors.

OBJECTIVES: Molecular analysis of tumor tissues has been extensively analyzed in germ cell tumors. However, genetic analysis of plasma circulating tumor DNA has been limited. Our objective was to analyze genetic alterations in circulating tumor DNA as well as its impact on prognosis in patients with chemo-refractory germ cell tumors. METHODS: We included 13 patients with chemo-refractory germ cell tumors who relapsed after second-line or higher previous chemotherapy and performed targeted sequencing of plasma cell-free DNA using an AVENIO Expanded kit. RESULTS: Tumor-specific genetic alterations were identified in all patients. The most frequently mutated gene was TP53 (53.4%), followed by PTEN (23.1%), GNAS (15.4%) and MTOR (15.4%). Moreover, EGFR amplification (38.5%) and MET amplification (15.4%) were also identified. We defined two or more single nucleotide variants detected in plasma cell-free DNA as circulating tumor DNA-positive. Kaplan-Meier analysis revealed that overall survival was significantly shorter in circulating tumor DNA-positive patients than circulating tumor DNA negative-patients (median overall survival 3.13 vs. 8.73 months; p = 0.042). CONCLUSION: Analysis of plasma circulating tumor DNA could detect genetic alterations in patients with chemo-refractory GCT. Moreover, detectable circulating tumor DNA in plasma was associated with poor prognosis in those patients. These results suggest that liquid biopsy using analysis of plasma circulating tumor DNA may be clinically useful for germ cell tumor patients.

Glucocorticoids coordinate the bladder peripheral clock and diurnal micturition pattern in mice.

Peripheral clocks function to regulate each organ and are synchronized though various molecular and behavioral signals. However, signals that entrain the bladder clock remain elusive. Here, we show that glucocorticoids are a key cue for the bladder clock in vitro and in vivo. A pBmal1-dLuc human urothelial cell-line showed significant shifts in gene expression after cortisol treatment. In vivo, rhythmic bladder clock gene expression was unchanged by bilateral adrenalectomy but shifted 4 h forward by corticosterone administration at the inactive phase. Moreover, the bladder clock shifted 8-12 h in mice that underwent both bilateral adrenalectomy and corticosterone administration at the inactive phase. These mice showed decreases in the diurnal rhythm of volume voided per micturition, while maintaining diurnal activity rhythms. These results indicate that the diurnal rhythm of glucocorticoid signaling is a zeitgeber that overcomes other bladder clock entrainment factors and coordinates the diurnal rhythm of volume voided per micturition.

The efficacy of sequential therapy with docetaxel and cabazitaxel for castration-resistant prostate cancer: A retrospective multi-institutional study in Japan.

OBJECTIVE: This study investigated the efficacy of docetaxel (DOC) and cabazitaxel (CBZ) and examined the factors associated with the prognosis of patients with castration-resistant prostate cancer (CRPC) receiving DOC-CBZ sequential treatment in Japanese real-world data. METHODS: We retrospectively evaluated data for 146 patients who received DOC followed by CBZ. The correlations of prostate specific antigen (PSA) decrease rate and time to progression between DOC and CBZ treatment were examined. Combined progression-free survival (PFS) of DOC-CBZ and overall survival (OS) from the initiation of DOC and the diagnosis of CRPC were evaluated and compared between patients with high and low PSA levels at the start of DOC and CBZ treatment. RESULTS: No correlations of PSA decrease rate and time to progression were observed between DOC and CBZ. The patients for whom DOC was started in higher PSA levels had significantly shorter combined PFS (p = 0.003) and OS from the initiation of DOC (p = 0.002). In patients who started DOC at high PSA levels, those who switched to CBZ at low PSA levels had longer OS than those who switched at high PSA levels (p = 0.048). The OS from CRPC of patients who started DOC at low PSA levels was significantly longer than those that started at high PSA levels (p = 0.030). CONCLUSIONS: For patients for whom DOC was not effective, sequential CBZ might have change to be effective. The PSA levels at the start of DOC and CBZ might be a potential prognostic biomarker.

Whole-Blood Gene Expression Profiles Correlate with Response to Immune Checkpoint Inhibitors in Patients with Metastatic Renal Cell Carcinoma.

In metastatic renal cell carcinoma (mRCC), the clinical response to immune checkpoint inhibitors (ICIs) is limited in a subset of patients and the need exists to identify non-invasive, blood-based, predictive biomarkers for responses. We performed RNA sequencing using whole-blood samples prospectively collected from 49 patients with mRCC prior to the administration of ipilimumab (IPI) and/or nivolumab (NIVO) to determine whether gene expression profiles were associated with responses. An analysis from 33 mRCC patients with complete responses (n = 5), partial responses (n = 14), and progressive disease (n = 14) showed 460 differentially expressed genes (DEGs) related to immune responses between the responder and non-responder groups with significant differences. A set of 14 genes generated from the initial 460 DEGs accurately classified responders (sensitivity 94.7% and specificity 50.0%) while consensus clustering defined clusters with significantly differing response rates (92.3% and 35.0%). These clustering results were replicated in a cohort featuring 16 additional SD patients (49 total patients): response rates were 95.8% and 48.0%. Collectively, whole-blood gene expression profiles derived from mRCC patients treated with ICIs clearly differed by response and hierarchical clustering using immune response DEGs accurately classified responder patients. These results suggest that such screening may serve as a predictor for ICI responses in mRCC patients.

Clinicopathological features of adrenal malignancies: Analysis of hospital-based cancer registry data in Japan.

OBJECTIVE: To identify the clinicopathological features of adrenal malignancies and analyze the prognoses of patients with adrenal cortical carcinoma (ACC) and malignant pheochromocytoma (MPCC). PATIENTS AND METHODS: We used a hospital-based cancer registry data in Japan to extract cases of adrenal malignancies that were histologically confirmed, diagnosed, and initially treated from 2012-2015. For survival analysis, we used data from the 2008-2009 cohort to estimate 5-year overall survival (OS) by the Kaplan-Meier method. RESULTS: A total of 989 adrenal malignancies were identified in the 2012-2015 cohort. The most common histologies were ACC (26.4%), diffuse large B-cell lymphoma (DLBCL; 25.4%), neuroblastoma (22.2%), and MPCC (11.9%). While most ACC and MPCC patients were in their 60s, DLBCL patients accounted for 61.5% of adrenal malignancies in the over-70 cohort. Among ACC patients with clinical staging data, 46.3% of patients were stage IV. Although surgery was a chief strategy for all stages, younger patients tended to receive combination therapy, including surgery and chemotherapy or hormone therapy. In the 2008-2009 cohort, the 5-year OS rates of ACC (n = 49) and MPCC (n = 23) patients were 56.2% and 86.4% while ACC patients without surgery had 1- and 2-year OS rates of 25.0% and 12.5%. CONCLUSION: In Japan, DLBCL accounted for the majority of adrenal malignancies in older patients. Despite advanced staging, ACC patients were mainly treated with surgery and their prognosis was not satisfactory. Such epidemiological data may be useful in considering initial management strategies.

[Adrenocortical Oncocytic Tumor : A Report of Two Cases].

Adrenocortical oncocytic tumors are rare. As the Weiss criteria overestimate the malignancy of oncocytic tumor due to histological hallmarks, the Lin-Weiss-Bisceglia system (LWB system) is required for an accurate diagnosis of the malignant potential of an oncocytic tumor. We report two cases diagnosed as an oncocytic tumor with uncertain malignant potential (borderline) and an oncocytic tumor (benign) based on the LWB system, both of which were diagnosed as malignant based on the Weiss criteria. Case 1 : A man in his 20s was referred to our hospital for treatment of a left adrenal tumor. A non-functional pheochromocytoma or adrenal cancer was suspected. He underwent surgical resection of the left adrenal tumor and left kidney. The specimen was positive for 3 of the 9 Weiss criteria, but met one minor criterion in the LWB system. He was diagnosed with an oncocytic tumor with uncertain malignant potential (borderline). Case 2 : A woman in her 40s was referred to our hospital for treatment of a left adrenal tumor. Under the possibility of adrenal cancer, she underwent surgical resection of the left adrenal tumor. The specimen was positive for 3 of the 9 Weiss criteria, but the specimen met no criteria in the LWB system. She was diagnosed with an oncocytic tumor (benign). There has been no recurrence of the oncocytic tumor as of 2 years of follow-up in the two patients.

Laparoendoscopic single-site surgery for urachal remnant with extraperitoneal approach through a suprapubic port.

INTRODUCTION: No standard procedure has been established for laparoendoscopic single-site surgery for urachal remnants (LESS-U). This study aimed to report the novel surgical techniques and initial outcomes of laparoendoscopic single-site surgery with an extraperitoneal approach through a suprapubic port for urachal remnants (spLESS). METHODS: Fifty-five patients (median age, 27 years; range, 15-69 years) who underwent LESS-U were analyzed. To overcome the limitations inherent in the conventional procedure (LESS-U through an umbilical port: uLESS), we modified the port placement and approached via the extraperitoneal space. spLESS is a novel procedure which reduces intestinal damage caused by the extraperitoneal approach and overcomes incomplete resection of the urachal remnant, especially in the bladder dome. Three trocars are inserted into the extraperitoneal space through a suprapubic port in spLESS, and complete resection of the urachal remnant from the umbilicus to the bladder is performed with an appropriate incision line. Patient characteristics and perioperative results were retrospectively collected. Cosmetic outcomes were prospectively evaluated using self-administered questionnaires (body image and photo-series questionnaire). RESULTS: spLESS and uLESS were performed in 43 and 12 patients, respectively. No differences were observed between the perioperative results. The cosmetic outcomes were compared between the groups using body image and photo-series questionnaires. No patient developed major complications; there was no recurrence in either group. CONCLUSIONS: spLESS is a novel procedure which can completely resect the urachal remnant and reduce the risk of intestinal damage. spLESS is a safe, effective, and feasible procedure with high postoperative cosmesis.

[A Case of Perfusion Failure of Peritoneal Dialysis Catheter Treated by Reduced Port Surgery].

A 17-year-old man received continuous ambulatory peritoneal dialysis (CAPD) catheter implantation and had started peritoneal dialysis. Perfusion failure of peritoneal dialysis catheter occurred one month after the catheter implantation. Transcatheter contrast examination revealed catheter obstruction about 4-5 cm from the catheter tip. We performed reduced port surgery to remove the obstruction. Laparoscopy revealed that the omentum was adhered to the abdominal wall and wrapped the catheter. We diagnosed the cause of catheter malfunction as omentum wrapping. We removed the omentum from the catheter, and repositioned the catheter into the Douglas fossa. Although CAPD worked successfully after the operation, perfusion failure recurred one month after the operation. The patient requested discontinuation of CAPD and change to hemodialysis. Therefore, we removed the CAPD catheter. The catheter was adhered to the omentum. Reduced port surgery for peritoneal dialysis catheter obstruction has the advantage of being minimally invasive and is a reliable procedure, but further studies are needed to reduce the recurrence rate of perfusion failure and to establish the procedure after perfusion failure.

Impact of Early Exposure to Simulation Program on Undergraduate Medical Students' Interest in Urology.

BACKGROUND: Urological education is as important as surgical training for undergraduates. However, students in undergraduate medical schools have less exposure to urology as their curriculum focuses more on clinical skills, particularly community-based healthcare for a super-aging society. This study aimed to evaluate whether urology-related hands-on training could increase the interest of undergraduate medical students in urology. METHODS: A 1-day elective program in urological surgery at the University of Tsukuba, particularly in robotic, laparoscopic, and endoscopic surgeries, was offered to 85 fourth-year medical students from 2018 to 2020, prior to their clinical clerkship. The average age of the participants was 22 (range: 21-25) years. We used a scoring system that comprised 1-5 Likert-type items to assess training activity, interest in surgery, and interest in urology before and after the course. RESULTS: Before attending the program, the average scores of interest in urology were 3.53 in 2018, 3.15 in 2019, and 3.00 in 2020. The scores in surgery increased after the program; however, this was not significantly different from scores prior to the program. However, the average interest scores in urology were significantly increased to 3.91 ± 0.63 (P < .05), 3.88 ± 0.58 (P < .01), and 4.00 ± 0.61 (P < 0.01) in 2018, 2019, and 2020, respectively. Total likely scores of this program in 2018, 2019, and 2020 were 4.59, 4.76, and 4.88, respectively, indicating a motivation to study surgery and urology during clinical clerkship. CONCLUSIONS: Urological hands-on training facilitated interest in urology in medical students prior to their clinical clerkship.

PLD1 promotes tumor invasion by regulation of MMP-13 expression via NF-κB signaling in bladder cancer.

Invasion of bladder cancer (BC) cells from the mucosa into the muscle layer is canonical for BC progression while phospholipase D isoform 1 (PLD1) is known to mediate development of cancer through phosphatidic acid (PA) production. We therefore used in silico, in vitro and in vivo approaches to detail the effect of PLD1 on BC invasion. In BC patients, higher levels of PLD1 expression were associated with poor prognoses. PLD1 knockdown significantly suppressed cellular invasion by human BC cells and matrix metalloproteinase-13 (MMP-13) was observed to mediate this effect. In our mouse bladder carcinogenesis model, the development of invasive BCs was suppressed by PLD1 knockout and a global transcriptomic analysis in this model indicated MMP-13 as a potential tumor invasion gene with NF-κB (nuclear factor-kB) as its transcriptional regulator. Furthermore, PA administration increased MMP-13 expression in line with NF-κB p65 phosphorylation levels. Collectively, we demonstrate that PLD1 promotes tumor invasion of BC by regulation of MMP-13 expression through the NF-κB signaling pathway and that PLD1 might be a potential therapeutic target to prevent clinical progression in BC patients.

Discrepancy between clinical and pathological T stages in upper urinary tract urothelial carcinoma: Analysis of the Hospital-Based Cancer Registry data in Japan.

OBJECTIVE: To examine the discrepancy between clinical and pathological T stages in patients with urothelial carcinoma of the upper urinary tract treated with radical surgery, and to compare them with the corresponding discrepancy in urothelial carcinoma of the bladder. METHODS: We used the Hospital-Based Cancer Registry data in Japan to extract urothelial carcinoma of the bladder cases (n = 3747) and urothelial carcinoma of the upper urinary tract cases (n = 6831), including urothelial carcinoma of the renal pelvis (n = 3295) and urothelial carcinoma of the ureter (n = 3536) with cT1-4N0M0 diagnosed in 2012-2015, histologically confirmed, and treated with radical surgery without chemotherapy or radiotherapy. We compared the T-stage discrepancy among different tumor locations. RESULTS: The proportions of overall T-stage discrepancy in the urothelial carcinoma of the renal pelvis (40.8%) and urothelial carcinoma of the ureter (42.9%) groups tended to be higher compared with that in the urothelial carcinoma of the bladder (38.8%) group. The upstaging rate from clinical non-muscle-invasive cancer (≤cT1) to pathological muscle-invasive cancer (≥pT2) was significantly higher in the urothelial carcinoma of the renal pelvis and urothelial carcinoma of the ureter groups compared with the urothelial carcinoma of the bladder group (P = 0.002, P < 0.0001, respectively). Upstaging from clinical organ-confined disease (≤cT2) to pathological non-organ-confined disease (≥pT3) was significantly more frequent in the urothelial carcinoma of the renal pelvis (27.8%, P < 0.0001) and urothelial carcinoma of the ureter (22.3%, P < 0.0001) groups compared with the urothelial carcinoma of the bladder (17.8%) group. CONCLUSION: Discrepancy in T staging is significantly higher in patients with urothelial carcinoma of the upper urinary tract compared with those with urothelial carcinoma of the bladder, especially in those with organ-confined disease. As T-stage discrepancy might lead to missed opportunities to carry out perioperative treatment, more accurate diagnostic techniques are required to identify the appropriate urothelial carcinoma candidates for preoperative treatment.

[A Case of Bladder Cancer Treated with Arterial Stent-Grafting to Prevent Uretero-Arterial Fistula Due to Radiation Therapy for Metastasis].

A 66-year-old male with bladder cancer underwent radical cystectomy and ileal conduit construction. The pathological diagnosis was urothelial carcinoma with squamous differentiation (pT3b). Computed tomography (CT) 18 months postoperatively revealed a right external iliac lymph node metastasis. He was treated with systemic chemotherapy after placement of bilateral ureteral stents, but CT following chemotherapy revealed an increase in the size of the metastasis, and the patient was diagnosed with progressive disease. Radiotherapy to the metastasis was selected as local therapy, but the patient was at risk of an uretero-arterial fistula because the right external iliac artery and the right ureter adjacent to the metastasis were involved in the irradiated field. The right external iliac lymph node metastasis was irradiated with a dose of 50 Gy after stent grafting for the right external iliac artery to prevent an ureteroarterial fistula. He had no adverse events, including hematuria after radiotherapy, but died of cancer cachexia 12 months after radiotherapy.

Chronoradiation Therapy for Prostate Cancer: Morning Proton Beam Therapy Ameliorates Worsening Lower Urinary Tract Symptoms.

BACKGROUND AND PURPOSE: Worsening lower urinary tract symptoms (LUTS) are a frequent adverse event following proton beam therapy (PBT) for localized prostate cancer. We investigated the differences in worsening LUTS among patients who received PBT at different times of day. PARTICIPANTS AND METHODS: Among 173 patients who underwent PBT for prostate cancer, 168 patients (median age 68.5 years) completed international prostate symptom score (IPSS) questionnaires and were included. Changes in the IPSS from baseline to the end of PBT were assessed by multiple linear regression analysis for age, National Comprehensive Cancer Network risk classification, androgen deprivation therapy, fractional PBT dose, clinical target volume, severity of IPSS, diabetes, LUTS medication use before PBT, anti-coagulant therapy and radiation time of day (morning (08:30-10:30), around noon (10:31-14:30), and late afternoon (14:31-16:30)). RESULTS: IPSS total score and IPSS-Quality of Life (QoL) score (12 patients were excluded due to missing IPSS-QoL score) increased from eight to 14.9 (p < 0.0001) and from two to four (p < 0.0001), respectively. Time of day (morning) was the only determinant for worsening LUTS (ß = -0.24, p < 0.01), voiding subscore (ß = -0.22, p < 0.05) and IPSS-QoL (ß = -0.27, p < 0.005), and was a determinant in item four (urgency) (ß = -0.28, p < 0.005) with age (ß = 0.19, p < 0.05). CONCLUSIONS: Morning PBT for localized prostate cancer significantly ameliorated worsening LUTS and improved QoL compared with treatment around noon or late afternoon. Chronoradiation therapy for localized prostate cancer may be effective and further research to elucidate the underlying mechanism is warranted.

Characteristics of penile cancer in Japan: An analysis of nationwide hospital-based cancer registry data.

OBJECTIVES: To investigate the clinical characteristics of patients with penile cancer in Japan using the nationwide hospital-based cancer registry database. METHODS: Using hospital-based cancer registry data, we described the distribution of age, pathology, tumor-node-metastases classification, and first-course treatment in patients treated between 2012 and 2015. We compared the patterns of first-line treatment between elderly and non-elderly patients. RESULTS: A total of 1012 patients were diagnosed with squamous cell carcinoma among 1773 patients with penile tumors who registered under topography code C60. The median age at diagnosis was 74 years, and 85.9% of patients were aged >60 years. The most common pathology was usual-type squamous cell carcinoma (91.9%), followed by verrucous carcinoma (5.0%), sarcomatoid carcinoma (1.1%), papillary carcinoma (0.7%), basaloid carcinoma (0.6%), adenosquamous carcinoma (0.4%), warty carcinoma (0.2%) and mixed carcinoma (0.1%). A total of 61.3% of patients were diagnosed with localized disease. In contrast, the proportions of patients with lymph node and distant metastases were 27.5% and 2.1% at diagnosis, respectively. The proportion of patients who were treated with chemotherapy as the first-course treatment was significantly lower among elderly patients (≥80 years) with clinical stage III (27.6% vs 7.1%, P = 0.0312) and clinical stage IV (53.2% vs 14.3%, P = 0.0086). CONCLUSIONS: Most penile cancer patients in Japan are diagnosed with usual-type squamous cell carcinoma, and those with human papilloma virus-related squamous cell carcinomas are <1%. Chemotherapy for advanced penile cancer is administered less in Japanese elderly (≥80 years) patients.

Small bowel obstruction due to internal hernia caused by the ureter after laparoscopic radical cystectomy and ileal conduit: A case report.

A 74-year-old man presented at our hospital with complaints of abdominal pain, nausea, and vomiting. He had undergone laparoscopic radical cystectomy and ileal conduit for urinary bladder cancer 1 month earlier. The patient had abdominal distention, resonant sounds on percussion, and diffuse abdominal tenderness without rebound or guarding. Abdominal CT revealed dilated jejunal loops herniated through a cord-like structure. Based on these findings, emergency surgery was performed, and intestinal dilatation into the space between the ureter, the ileal conduit, and the sacral bone was detected. The loops were released manually and were not resected. To the best of our knowledge, this is the first case report of small bowel obstruction due to internal hernia caused by the ureter after laparoscopic radical cystectomy and ileal conduit. Retroperitonealization and the minimum required mobilization of the ureters may be necessary when urinary diversion is constructed, especially in laparoscopic or robotic surgeries.

Impact of relative dose intensity in gemcitabine-cisplatin chemotherapy for metastatic urothelial carcinoma.

OBJECTIVES: To evaluate the impact of relative dose intensity for gemcitabine-cisplatin chemotherapy in patients with metastatic urothelial carcinoma. METHODS: We retrospectively reviewed the medical records of 18 patients with metastatic urothelial carcinoma, who received gemcitabine-cisplatin regimen as the first-line chemotherapy between 2009 and 2015. The doses of gemcitabine and cisplatin were reduced or the intervals between treatment cycles were prolonged according to the treatment efficacy and adverse events during the first and second cycles. The individually optimal relative dose intensity was set as the actual dose per the standard dose in the first and second cycles. From the third course onward, patients received the gemcitabine-cisplatin chemotherapy with the same relative dose intensity. Overall survival was compared with the groups according to the value of relative dose intensity. RESULTS: The median age was 72.5 (range, 56-79) years and 15 men and 3 women were enrolled in the study. The median number of cycles of first-line gemcitabine-cisplatin chemotherapy was 8 (range, 2-17), and the median survival time from initiation of first-line chemotherapy was 20.1 (range, 3.5-32.8) months. The total median relative dose intensity of gemcitabine-cisplatin chemotherapy was 56.1%. The median survival time of 10 patients in the group with the relative dose intensity of less than 60% was significantly longer than that of 8 patients in the group with the relative dose intensity of more than 60% (19.2 and 11.0 months, respectively, p = 0.04). CONCLUSION: Individual low relative dose intensity management in the first-line gemcitabine-cisplatin chemotherapy may be an acceptable option for patients with metastatic urothelial carcinoma.

[A Case of Leiomyosarcoma Arising from the Ovarian Vein Preoperatively Diagnosed with Radiological Imaging].

A 54-year-old woman presented withtransient back pain. She was diagnosed withleiomyosarcoma of the inferior vena cava (IVC) by computed tomography (CT) and was referred to our hospital. Contrastenhanced CT revealed a mass (38×42 mm) located in the retroperitoneal space along the course of the right ovarian vein. The mass compressed the IVC into a crescent shape. A tumor thrombus was also found in the IVC. 18 F-fluoro-2-deoxy-D-glucose positron emission tomography (PET) revealed high uptake at the caudal side of the tumor. These radiological findings strongly suggested the diagnosis of leiomyosarcoma arising from the right ovarian vein. She underwent tumor resection with right nephrectomy, IVC resection, and IVC patch reconstruction without any notable events after surgery. Histopathological diagnosis was leiomyosarcoma arising from the ovarian vein, not from the IVC. Two months after the surgery, CT revealed multiple pulmonary metastases and a single liver metastasis. The patient was referred to another hospital for further treatment. She was treated with chemotherapy and was alive with disease at 14 months after the surgery.