Mitochondrial genome deletion aids in the identification of false- and true-negative prostate needle core biopsy specimens

We report the usefulness of a 3.4-kb mitochondrial genome deletion (3.4 mtdelta) for molecular definition of benign, malignant, and proximal to malignant (PTM) prostate needle biopsy specimens. The 3.4 mtdelta was identified through long-extension polymerase chain reaction (PCR) analysis of frozen prostate cancer samples. A quantitative PCR assay was developed to measure the levels of the 3.4 mtdelta in clinical samples. For normalization, amplifications of a nuclear target and total mitochondrial DNA were included. Cycle threshold data from these targets were used to calculate a score for each biopsy sample. In a pilot study of 38 benign, 29 malignant, and 41 PTM biopsy specimens, the difference between benign and malignant core biopsy specimens was well differentiated (P & .0001), with PTM indistinguishable from malignant samples (P = .833). Results of a larger study were identical. In comparison with histopathologic examination for benign and malignant samples, the sensitivity and specificity were 80% and 71%, respectively, and the area under a receiver operating characteristic (ROC) curve was 0.83 for the deletion. In a blinded external validation study, the sensitivity and specificity were 83% and 79%, and the area under the ROC curve was 0.87. The 3.4 mtdelta may be useful in defining malignant, benign, and PTM prostate tissues.

Tracking Indigenous Applicants Through the Admissions Process of a Socially Accountable Medical School

PURPOSE

To describe the admissions process and outcomes for Indigenous applicants to the Northern Ontario School of Medicine (NOSM), a Canadian medical school with the mandate to recruit students whose demographics reflect the service region's population.

METHOD

The authors examined 10-year trends (2006-2015) for self-identified Indigenous applicants through major admission stages. Demographics (age, sex, northern and rural backgrounds) and admission scores (grade point average [GPA], preinterview, multiple mini-interview [MMI], final), along with score-based ranks, of Indigenous and non-Indigenous applicants were compared using Pearson chi-square and Mann-Whitney tests. Binary logistic regression was used to assess the relationship between Indigenous status and likelihood of admission outcomes (interviewed, received offer, admitted).

RESULTS

Indigenous qualified applicants (338/17,060; 2.0%) were more likely to be female, mature (25 or older), or of northern or rural background than non-Indigenous applicants. They had lower GPA-based ranks than non-Indigenous applicants (P < .001) but had comparable preinterview-, MMI-, and final-score-based ranks across all admission stages. Indigenous applicants were 2.4 times more likely to be interviewed and 2.5 times more likely to receive an admission offer, but 3 times less likely to accept an offer than non-Indigenous applicants. Overall, 41/338 (12.1%) Indigenous qualified applicants were admitted compared with 569/16,722 (3.4%) non-Indigenous qualified applicants.

CONCLUSIONS

Increased representation of Indigenous peoples among applicants admitted to medical school can be achieved through the use of socially accountable admissions. Further tracking of Indigenous students through medical education and practice may help assess the effectiveness of NOSM's social accountability admissions process.

Transverse Lumbotomy for Open Partial/Radical Nephrectomy: How I Do It

INTRODUCTION

Conventional open surgical techniques allow proper surgical management for renal malignancies but have their intrinsic drawbacks. The aim of this paper is to present our technique in minimal renal exposure while avoiding the intrinsic complications of conventional techniques.

METHODS

We described our technique, which can be easily understood and replicated by urologists performing open kidney surgery.

RESULTS

Ninety-five patients had this technique done safely over the last 4 years, and 3 patients had this exposure changed into intraperitoneal extended wound for very large upper pole tumours. The median operating time was 70 min. No single patient required intraoperative blood transfusion. Median warm ischemic time was 9 min.

CONCLUSION

Transverse lumbotomy is a safe reproducible technique that allows proper kidney exposure through a relatively smaller wound and avoiding unnecessary auxiliary techniques as rib resection, pleural tear management, and intraperitoneal exposure.

Systematic Review: Safety of Intravesical Therapy for Bladder Cancer in the Era of COVID-19

A novel coronavirus has emerged in late 2019 capable of causing a severe respiratory disease known as COVID-19. Its pathogenesis appears to be the initiation of an immune response and resulting cytokine storm that damages the healthy lung tissue of the host. Some epidemiological studies found bacillus Calmette-Guérin (BCG) vaccine can help to decrease morbidity and mortality of the viral infection. We aim to review and summarize what is known about COVID-19 and the current implications of intravesical BCG with regard to the disease.

Bacillus Calmette-Guerin vaccine and bladder cancer incidence: Scoping literature review and preliminary analysis

BACKGROUND

The Bacillus Calmette-Guerin (BCG) vaccine has long been used for the prevention of tuberculosis (TB) around the world. BCG is also used as an immunotherapy agent for the treatment of non-muscle invasive urinary bladder cancer. This scoping literature review and preliminary data analysis aims to summarize the literature correlating infantile BCG vaccination with the incidence of future bladder cancer.

METHODS

Studies were identified by a formal literature search of MEDLINE and Cochrane Central Registrar of Controlled Trials following PRISMA guidelines. Preliminary data analysis was conducted on publicly accessible data summarizing the impact of gender, BCG vaccination, and socio-economic effects on crude and age-standardized rates of bladder cancer.

RESULTS

As part of our analysis, preliminary regression models demonstrated BCG vaccination status, gender, and socio-economic status to have statistically significant effects on crude and age-standardized rates of bladder cancer incidence. BCG vaccination was associated with a 35-37% lower age-standardized rate of bladder cancer incidence.

CONCLUSIONS

There is very little literature examining the relationship between prior BCG vaccination and rates of bladder cancer incidence. Our limited data analysis indicates that a relationship does exist between infantile BCG vaccination and later bladder cancer development, although extensive future investigation is needed in this area.

Solitary prostatic cancer metastasis to the testis: A case report and lessons to learn

Prostate cancer (Pca) is a complex disease. Several case series and reports have described the spread of Pca to unusual organs, like esophagus, eye and periureteric fat causing ureteropelvic junction obstruction. Spread of Pca to the testis has been reported in few case reports, however Pca was always firstly diagnosed in all published cases and testicular spread of cancer has been diagnosed during follow up of the patients. This case is unique in that, the patient initially presented with a testicular mass and histologic examination after orchiectomy allowed to diagnose prostatic cancer. This patient was 81 years old and he never had PSA screening by his family doctor. PSA was not even done initially by us considering his age and the presentation with testicular mass. This case may impact clinical practice in several ways: 1) considering Pca always in the differential diagnosis of any disease of an adult man, regardless of its presentation because we did not do that at initial patient evaluation and PSA was only measured after orchiectomy when pathology demonstrated metastatic Pca; 2) suggesting standard orchiectomy with epididemectomy for surgical castration instead of the current surgical technique of subcapsular/subepididymal orchiectomy, because our patient had cancer involving his epididymis as well; 3) suggesting to include PSMA as a part of preoperative staging for high risk Pca patients, in consideration that PSMA is proving to be a promising new imaging technique that can help diagnosing metastatic Pca in unusual locations.

Aristolochic acid: What urologists should know

To the Editor, Aristolochic acid is one of major causes for upper tract urothelial carcinoma, especially in younger population. While it is mentioned as a cause in guidelines, little is actually known about the toxin by urologists. We are aiming in our letter to provide some direct and clear information to ourselves that would help us to know more about that toxin and how it can adversely affect our patients [...].

Adrenalectomy for huge solid pheochromocytoma: a challenging surgery or piece of cake?

Pheochromocytoma (PCC) is an uncommon adrenal tumor that is occasionally diagnosed during the work up for patients with uncontrolled hypertension. Treatment of PCC is mainly surgical. This case represents the largest PCC reported to date, which was safely removed.

A geographic-location-based medical school admissions process does not influence pre-clerkship and licensing examination academic performance

Background

Students are selected for admission to the Northern Ontario School of Medicine University (NOSM U) MD degree program using criteria aiming to maximize access of persons thought most likely to practice in the region, including use of a geographic context score (GCS) which ranks those with lived experience in northern Ontario and/or rurality most highly. This study investigates the effect of this admissions process upon medical school academic performance.

Methods

We used a retrospective cohort design combined with multiple linear regression analysis to investigate the relationship between admission scores and performance on pre-clerkship courses, and the Medical Council of Canada Qualifying Exam Part 1 (MCCQE1).The GCS did not significantly explain performance variance on any pre-clerkship course, nor on the MCCQE1, while the undergraduate Grade Point Average correlated with most assessment scores. The number of prior undergraduate biomedical courses predicted science and clinical skills performance, particularly in Year 1, but not with MCCQE1 scores. Performance on Year 2 courses, particularly foundational sciences and clinical skills, significantly predicted MCCQE1 scores.

Results

Our data suggest that admission geographic context scoring is unrelated to future academic performance. Further, students with fewer prior undergraduate biomedical courses may benefit from increased support and/or a modified program during the early years.

History of infantile BCG immunization did not predict lamina propria invasion and/or high-grade in patients with non-muscle invasive bladder cancer

OBJECTIVE

To evaluate the utility of infantile BCG vaccination history in predicting stage and grade of tumours in non-muscle invasive bladder cancer (NMIBC).

MATERIALS AND METHODS

We retrospectively analyzed data from patients from a single center who were diagnosed with new NMIBC and underwent transurethral resection of bladder tumour (TURBT) between 2017 and 2022. We assessed BCG immunization status with various demographics and comorbidities, as well as tumour recurrence, progression, stage, and grade.

RESULTS

A total of 188 patients met the inclusion criteria for our study. The mean age of patients at the time of diagnosis was significantly lower in those that had been immunized with BCG (71 ± 9) than those who had not (77 ± 10) (p < 0.0001). History of BCG immunization did not correlate with sex, history of diabetes mellitus (DM), prior history of intravesical BCG treatment, and tumour recurrence, progression, stage, and grade.

CONCLUSIONS

History of infantile BCG vaccination did not correlate with the depth of invasion and/or the grade in patients with non-muscle invasive bladder cancer. Patients that received infantile BCG vaccination were significantly younger at the time of diagnosis of NMIBC.

'Top-Down' holmium laser enucleation of the prostate. Report of initial cases performed by a single surgeon

Objectives

To present the 12-month outcomes of ‘Top-Down’ holmium laser enucleation of the prostate (HoLEP).

Patients and methods

We retrospectively reviewed the charts of prospectively collected patients who underwent Top-Down HoLEP between 2017 and 2018. All cases were operated upon by a single urologist (H.E), using a 100-W holmium:YAG laser with a 550-μm laser fibre. We recorded the enucleation time, morcellation time, intraoperative, and postoperative complications. All patients had postoperative follow-up visits at 1, 3, 6 and 12 months. The evaluation included the International Prostate Symptom Score (IPSS), quality-of-life (QoL) assessment, measurement of maximum urinary flow rate (Q_max) and the post-void residual urine volume (PVR).

Results

A total of 60 consecutive patients were recruited. The median (range) prostatic volume, resected prostatic weight, and percentage of resected prostatic tissue were 124 (70–266) mL, 90 (44–242) g and 76 (46–97)%, respectively. The median (range) enucleation and morcellation times were 80 (25–200) and 14.5 (4–58) min, respectively. One patient had a simple bladder mucosal injury and another developed clot retention. At 3 months, three patients (5%) had stress urinary incontinence (SUI) and eight patients (13.3%) presented with urge UI (UUI). At the last follow-up visit, one patient (1.7%) presented with persistent SUI, while three patients (5%) presented with UUI. The IPSS and QoL significantly improved during the follow-up period (P = 0.045 and P = 0.04, respectively).

Conclusion

The results of the Top-Down technique are comparable to those of traditional HoLEP. However, the Top-Down technique may reduce the complexity, operating time, and SUI rates.

Abbreviations

BN: bladder neck; HoLEP: holmium laser enucleation of the prostate; PVR: post-void residual urine volume; Q_max: maximum urinary flow rate; QoL: quality of life; TOV: trial of voiding; (S)(U)UI: (stress) (urge) urinary incontinence

Radical cystectomy for bladder urothelial carcinoma with aggressive variant histology

Purpose: The aim of this study is to report our experience in managing bladder cancer in patients with variant pathology. Methods: Retrospective data collection for all patients managed by radical cystectomy over the last 3 years for a variant pathol-ogy was completed. We specifically included micropapillary and nested variants. Results: Ten patients were identified, with eight having micropapillary carcinoma (MPC) and two having nested vari-ants. Nine patients were male. The median age was 75. The two patients with nested variant were 56 and 62 years old, respec-tively, whereas all patients with MPC were over the age of 70. Upon cystectomy of all micropapillary cases, three patients(37.5%) had positive lymph node invasion and the final patholo-gy was T2 (two patients), T3 (two patients), and T4 (four patients). Barring a grade III complication Clavien-Dindo classi-fication due to wound dehiscence that necessitated secondary surgical closure, there were no specific perioperative complica-tions. Given the urethral invasion, cystourethrectomy was per-formed on the female patient. Within a median 13-month fol-low-up, three patients developed local recurrence, including two urethral and one new lateral pelvic mass. Conclusions: Considering the muscle invasive nature of micropapillary and nested bladder cancer, aggressive surgical management should not be postponed. Moreover, due to notable prevalence of concurrent and/or recurrent urethral involvement, initial urethrectomy or early and frequent postoperative ure-throscopy should be provided. Patients with variant histology bladder cancer may benefit from early radical cystectomy when compared to bladder sparing protocols and prostate sparing cystectomy treatment options. 

Sunitinib cause delayed complete response on metastatic RCC and extensive IVC thrombus, but not to the kidney tumor: a case report and review of literature

The role of cytoreductive nephrectomy for metastatic renal cell carcinoma (RCC) is currently debated, with the advancements in target therapy development. The aim of our work was to present an interesting case report with mini review to describe the important role of cytoreductive nephrectomy for kidney cancer control that failed to respond well to Sutent, in spite of good response for all metastases. Medline review of related English publication was conducted and included to the study. RCC response to Sutent is inferior to the response of its metastases. Cytoreductive nephrectomy still plays an important role in metastatic RCC and may be an integral part for cancer control, in properly selected patients.

Fifteen-year experience with pediatric renal transplantation at the Montefiore Medical Center

At Montefiore Medical Center, 140 pediatric recipients have received 155 renal allografts over a 16-year period with an overall 6% mortality. Graft survival was not significantly different based upon race or sex of recipient. Graft survival was significantly better for first time transplants and the youngest recipients. Graft survival was significantly improved using Tacrolimus immunosuppression.

A Rare Case of Simultaneous Pheochromocytoma Accompanied with an Ileocecal Neuroendocrine Tumor

The detection rates of neuroendocrine tumors (NETs) are rising, which has led to a better understanding of their histopathologic characteristics. We present a case of adrenal pheochromocytoma with an incidental finding of a concurrent ileocecal NET detected on early post-adrenalectomy imaging. A 59-year-old male was noted to have microscopic hematuria on a routine workup. Further imaging identified a right adrenal lesion suggestive of pheochromocytoma. He was reporting intermittent headaches, and his urinary normetanephrine and norepinephrine levels were elevated. He underwent a right retroperitoneal adrenalectomy, and pathology confirmed a pheochromocytoma with no malignancy. Postoperatively, he developed a hematoma at the surgical bed that was identified on CT scan. An incidental lesion at the level of the ileocecal valve was noted on the CT scan as well. This was further investigated by colonoscopy and biopsy that confirmed a carcinoid tumor. He had no gastrointestinal symptoms, chromogranin A was normal, and 24-h urinary 5-hydroxyindolacetic acid levels were slightly elevated. He subsequently underwent a laparoscopic right hemicolectomy 3 months from his initial adrenalectomy. Final pathology confirmed a grade 2 NET with metastatic involvement of 4 regional lymph nodes. We report an extremely rare case of simultaneous pheochromocytoma accompanied with an ileocecal NET. Genetic testing for multiple endocrine neoplasia was undertaken and was found negative for 9 tested genes.

Micropapillary bladder cancer: an added indication to prophylactic urethrectomy

There is little research on the role of urethrectomy during cystectomy in patients with micropapillary bladder cancer (MPBC). We present two cases of MPBC cystectomy and suggest that urethrectomy be performed concurrently as a preventive measure. The first case involved a woman who had a mixed solid and papillary bladder tumour. An anterior pelvic exenteration was performed as well as a total urethrectomy. The T4a micropapillary variant tumour was confirmed by pathology. The second case involved a man with T1 MPBC who was treated with a BCG induction course. A recurrent muscle-invasive MPBC was discovered during follow-up. During the radical cystoprostatectomy, the urethra was spared. T2 MPBC was discovered through pathology. He had a urethrectomy 6 months later due to urethral bleeding, and the pathology revealed micropapillary cancer of the urethra.

Endophytic to total tumour volume ratio: An added variable to patients with T1b/T2 renal tumours undergoing partial nephrectomy

INTRODUCTION

Partial nephrectomy is the standard of care to patients with small renal masses. It is still encouraged to larger tumours whenever feasible. The aim of this study is to look for the endophytic to total tumour volume ratio as an added variable to study the complexity of partial nephrectomy to patients with T1b/ T2 renal tumours.

METHODS

Retrospective data collection of patients that had partial nephrectomy for T1b/T2 renal tumours by a single surgeon was done. Radiological re-assessment for the CT images to measure the endophytic to total tumour volume ratio was done.

RESULTS

The mean age of the patients was 63 years. The study included 25 males and 11 females. All cases were managed by open surgery using retroperitoneal transverse lateral lumbotomy and warm ischemia was used in all patients. The mean tumour volume was 74 cc, the mean endophytic tumour volume was 29 cc. The mean percentage of endophytic to total tumour volume was 42%.

CONCLUSIONS

Partial nephrectomy is safe for most of the patients with good performance status, having large renal masses. More complex surgery can be predicted in patients with endophytic to total tumour volume greater than 42%.

Patient-reported outcomes following radical prostatectomy

The present study was designed to assess disease-specific outcome measures of impotence, incontinence and stricture disease after radical prostatectomy through an anonymous patient self-reported questionnaire. Recent studies suggest complications reported anonymously by patients are higher than previously reported. The aim is to provide clinicians with site-specific patient information which may be of benefit in pre-operative and postoperative patient encounters. Patient self-reported incidence of postoperative impotence (82.2%) and ongoing incontinence (59.3%) was high but consistent with several published reports.3-12,21 The patient self-reported incidence of stricture (15.2%) was low.

Very late locally recurrent chromophobe renal cell carcinoma: 15 years following radical nephrectomy for low-stage disease

The majority of patients with renal cell carcinoma develop recurrence within 5 years following radical nephrectomy. Very late sole local recurrence beyond 10 years is rare, and all reported cases had clear cell histology. Surgical resection of local recurrence remains the best option for disease management. This case opens the way for further studying the rare histological variants of renal cancer and to encourage prolonged follow-up and offering surgery as the best option for managing these cases.

Radical cystectomy for clinical T4b urothelial carcinoma: An Ontario, single-center experience

INTRODUCTION

Guidelines surrounding the management of T4b muscle-invasive bladder cancer (MIBC) with radical cystectomy (RC) are limited and lack clarity. Our objective was to analyze our single-center experience to provide additional insight into the role of RC.

METHODS

We performed a retrospective data analysis using clinical, radiological, and pathological information for all patients managed by RC for cT4b MIBC at the Thunder Bay Regional Health Sciences Centre (July 2015 to July 2020). Patients that had MIBC as their first diagnosis were termed the de novo group and patients that were initially diagnosed as having non-MIBC were termed the progressive group.

RESULTS

Nineteen consecutive patients (16 males and three females), with a median age of 68 years, managed by two urologists over the last five years, met study criteria. Eleven (58%) of the patients had de novo MIBC while eight (42%) presented with progressive disease. All patients had dysuria as a presenting symptom. Only one (5%) patient received neoadjuvant chemotherapy. There were low rates of perioperative transfusion (11%), bowel resections (5%), postoperative transfusions (0%), ileus (32%), urine leak (16%), and wound dehiscence (5%). Fourteen patients (74%) had positive lymph nodes. All patients had adjuvant chemotherapy. The one-year recurrence rate in these patients was 53%, with 32% of recurrence being distant metastasis. The one-year survival rate was 95%.

CONCLUSIONS

Patients in the de novo and progressive arms of our cohort had similar rates of surgical complications and disease recurrence. We found operative morbidity and disease control to be reasonable, suggesting RC can be considered more often in the management of T4b MIBC patients.

Case - Late abdominal wall recurrence following open nephroureterectomy for urothelial carcinoma

Upper tract urothelial carcinoma (UTUC) recurrence following open nephroureterectomy to the surgical wound is very uncommon. Herein, we describe a case with late abdominal wall recurrence, surgically removed, with no evidence of further recurrence over a short period of followup.