Publications by authors named "Mas Jewett"

Objective: To explore patients' experience of decision making regarding treatment of localised kidney cancer.

Methods: A total of 21 patients with localised kidney cancer, across three countries, participated in either four focus groups or seven semi-structured interviews that lasted on average 2 h. Focus groups and interviews were all conducted in the participants' native language, recorded, transcribed and (if applicable) translated into English.

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Objectives: To compare the outcomes and treatment burden of primary retroperitoneal lymph node dissection (pRPLND) alone versus pRPLND + adjuvant chemotherapy (AC) in patients with pathological stage II (PSII) non-seminomatous germ cell tumours (NSGCT).

Patients And Methods: Retrospective review of the Princess Margaret Cancer Center eTestes cancer database identified patients with PSII NSGCT after pRPLND between 1995 and 2020. The primary outcome was relapse-free survival (RFS).

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Objectives: To assess whether office-based fulguration (OF) under local anaesthesia for small, recurrent, pathological Ta low-grade (LG) non-muscle-invasive bladder cancer (NMIBC) is an effective alternative to transurethral resection of bladder tumour (TURBT), avoiding the costs and risks of procedure, and anesthesia.

Patients And Methods: Of 521 patients with primary TaLG NMIBC, this retrospective study included 270 patients who underwent OF during follow-up for recurrent, small, papillary LG-appearing tumours at a university centre (University Health Network, University of Toronto, Canada). We assessed the cumulative incidence of cancer-specific mortality (CSM) and disease progression (to MIBC or metastases), as well as possible direct cost savings.

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Article Synopsis
  • Researchers wanted to compare two treatments for bladder cancer: one is surgery (radical cystectomy), and the other is a combination of surgery, chemotherapy, and radiation (trimodality therapy).
  • They studied 722 patients with similar cancer stages from different hospitals in the USA and Canada to see which treatment worked better.
  • The main goal was to see which treatment helped patients live longer without their cancer spreading, and they used complex methods (like matching patients) to ensure fair comparisons.
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Objectives: To evaluate variant histologies (VHs) for disease-specific survival (DSS) in patients with invasive urothelial bladder cancer (BCa) undergoing radical cystectomy (RC).

Materials And Methods: We analysed a multi-institutional cohort of 1082 patients treated with upfront RC for cT1-4aN0M0 urothelial BCa at eight centres. Univariable and multivariable Cox' regression analyses were used to assess the effect of different VHs on DSS in overall cohort and three stage-based analyses.

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Background: A phase 1b study of photosensitizer TLD-1433-mediated photodynamic therapy (PDT) was performed in bacillus Calmette-Guérin (BCG)-unresponsive non-muscle-invasive bladder cancer (NMIBC) patients.

Objective: The primary objectives were safety and tolerability of PDT, with secondary objectives of (1) pharmacokinetic (PK) properties of TLD-1433 and (2) efficacy, as evaluated by recurrence-free survival and complete response (CR) at 90 and 180 d for patients treated at the maximum recommended starting dose (0.35 mg/cm bladder surface area) and the therapeutic dose (0.

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The second Kidney Cancer Research Summit was held virtually in October 2020. The meeting gathered worldwide experts in the field of kidney cancer, including basic, translational, and clinical scientists as well as patient advocates. Novel studies were presented, addressing areas of unmet need related to different topics.

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Article Synopsis
  • The study aimed to explore the link between FGFR3 mutations and certain IHC markers (p53 and Ki-67) in invasive bladder cancer, as well as their impact on patient outcomes after radical cystectomy.
  • A total of 1058 patients were analyzed, revealing that FGFR3 mutations were associated with less aggressive cancer features and better disease-specific survival, while abnormal p53 and Ki-67 levels correlated with more aggressive tumor characteristics.
  • The findings suggest that FGFR3 mutations could help identify patients with favorable bladder cancer for tailored treatment strategies, alongside traditional indicators like tumor stage and nodal status.
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Background: Personalized treatment for clinical T1 renal cortical masses (RCMs) should take into account competing risks related to tumor and patient characteristics.

Objective: To develop treatment-specific prediction models for cancer-specific mortality (CSM), other-cause mortality (OCM), and 90-d Clavien grade ≥3 complications across radical nephrectomy (RN), partial nephrectomy (PN), thermal ablation (TA), and active surveillance (AS).

Design, Setting, And Participants: Pretreatment clinical and radiological features were collected for consecutive adult patients treated with initial RN, PN, TA, or AS for RCMs at four high-volume referral centers (2000-2019).

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Clinical guidelines for guiding clinical decision-making must be trustworthy, especially when there is controversy or a shifting paradigm. In urology, the management of small renal masses is one area in which there is currently a paradigm shift towards active surveillance. A number of international guidelines address this paradigm shift to some extent, with varying degrees of rigor.

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Objectives: To study the effects of adjuvant therapy in patients with sarcomatoid renal cell carcinoma (sRCC) enrolled in the randomised phase III clinical trial E2805.

Patients And Methods: The original trial (E2805) was a randomised, double-blinded phase III clinical trial comparing outcomes in 1943 patients with RCC accrued between 2006 and 2010 and treated with up to 1 year of adjuvant placebo, sunitinib, or sorafenib. The present study analyses the cohort of patients with sRCC that participated in E2805.

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Article Synopsis
  • Renal cell carcinoma (RCC) is thought to have a significant hereditary component, yet there are few established guidelines for assessing genetic risks associated with it.
  • A North American panel of experts from various specialties gathered to reach a consensus on key questions related to RCC genetic risk assessment using a modified Delphi methodology.
  • The panel agreed on 30 important statements concerning the criteria for genetic testing, emphasizing the importance of family history and the need for risk assessments in specific patient populations, while also recognizing areas requiring further research.
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The role of retroperitoneal lymph node dissection (RPLND) in testicular cancer is well established in both the primary and post-chemotherapy setting. The aim of this study was to report our 2 years oncological outcomes of robotic RPLND. A retrospective review was performed of all patients undergoing robotic RPLND by a single surgeon at Princess Margaret Cancer Centre.

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Background: Risk stratification for localized renal cell carcinoma (RCC) relies heavily on retrospective models, limiting their generalizability to contemporary cohorts.

Objective: To introduce a contemporary RCC prognostic model, developed using prospective, highly annotated data from a phase III adjuvant trial.

Design, Setting, And Participants: The model utilizes outcome data from the ECOG-ACRIN 2805 (ASSURE) RCC trial.

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Objective: Men with metastatic nonseminomatous germ cell tumors (NSGCTs) often present with residual chest tumors after chemotherapy. We examined the pathologic concordance of intrathoracic disease and outcomes based on the worst pathology of disease resected at first thoracic surgery.

Methods: A retrospective analysis was performed of consecutive patients undergoing thoracic resection for metastatic NSGCT in our institution between 2005 and 2018.

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  • The study aimed to evaluate the effectiveness and safety of inducing renal hypothermia during partial nephrectomy for kidney tumors, challenging the existing belief that it preserves kidney function.
  • A randomized controlled trial was conducted with 184 patients, comparing renal hypothermia against a control group, and measuring glomerular filtration rates (mGFR) before and one year after surgery.
  • The results showed no significant difference in kidney function loss between the two groups, suggesting that renal hypothermia may not provide the expected benefits during partial nephrectomy.
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Background: Optimal management of clinical stage I (CSI) testicular cancer is controversial due to lack of robust prognostic factors; miRNA-371a-3p holds promise as a biomarker, although its clinical utility for identifying patients at risk of relapse is unknown.

Objective: To explore the association between serum miR-371a-3p and CSI surveillance relapse.

Design, Setting, And Participants: Serial banked sera from 151 CSI (101 seminomas and 50 nonseminomatous germ cell tumors [NSGCTs]) samples from our Princess Margaret active surveillance cohort were tested.

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At the Canadian Testis Cancer Workshop, the multidisciplinary management of testis cancer care was discussed. The two-day workshop involved urologists, medical and radiation oncologists, pathologists, radiologists, physician's assistants, residents, fellows, nurses, patients, and patient advocacy group members.This review summarizes the discussion regarding clinical dilemmas in local and regional testis cancer.

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Background: There is controversy regarding the management of patients with normal markers and residual masses (≤1 cm) after chemotherapy for nonseminomatous germ cell tumors (NSGCTs).

Objective: To determine long-term outcomes of a surveillance strategy in such patients.

Design, Setting, And Participants: A retrospective review of our multidisciplinary testicular cancer database was performed.

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Fibroblast growth factor receptor 3 (FGFR3) is an actionable target in bladder cancer (BC). FGFR3 mutations are common in noninvasive BC and associated with favorable BC prognosis. Overexpression was reported in up to 40% of FGFR3 wild-type muscle-invasive BC.

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Background: Most reports of active surveillance (AS) of small renal masses (SRMs) lack biopsy confirmation, and therefore include benign tumors and different subtypes of renal cell carcinoma (RCC).

Objective: We compared the growth rates and progression of different histologic subtypes of RCC SRMs (SRM) in the largest cohort of patients with biopsy-characterized SRMs on AS.

Design, Setting, And Participants: Data from patients in a multicenter Canadian trial and a Princess Margaret cohort were combined to include 136 biopsy-proven SRM lesions managed by AS, with treatment deferred until progression or patient/surgeon decision.

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Background: Traditionally, intervention was recommended for angiomyolipomas (AMLs) >4 cm due to the risk of catastrophic hemorrhage.

Objective: To delineate the natural history of AMLs, including growth rates and need for intervention.

Design, Setting, And Participants: A retrospective review was performed of an AML series from 2002 to 2013, which have been followed prospectively until 2018.

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