Publications by authors named "Keith Chan"

Chemotherapy is often combined with surgery for muscle invasive and nonmuscle invasive bladder cancer (BCa). However, 70% of the patients recur within 5 years. Metabolic reprogramming is an emerging hallmark in cancer chemoresistance.

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  • * Researchers aim to use therapeutic ultrasound, specifically a technique called histotripsy, as a noninvasive way to destroy bacteria within these abscesses.
  • * The study found a strong link between the size of the cavitation cloud produced during histotripsy and the effectiveness of bacterial inactivation, indicating promising potential for this ultrasound method.
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Multiple myeloma (MM), a hematological malignancy of the bone marrow, remains largely incurable. The orphan G protein-coupled receptor, GPRC5D, which is uniquely expressed in plasma cells and highly expressed in MM, is a compelling candidate for immunotherapy. In this study, we investigated the efficacy of a combination of DNA vaccine encoding mouse GPRC5D and PD-1 blockade in preventing and treating MM using the 5TGM1 murine model of MM.

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  • A study forecasts a 91.2% increase in crude cardiovascular disease (CVD) mortality in Asia from 2025 to 2050, despite a 23.0% decrease in the age-standardized mortality rate.
  • Ischaemic heart disease and stroke will remain the top causes of mortality, with Central Asia experiencing the highest mortality rates while high systolic blood pressure is identified as the leading risk factor across most of Asia.
  • The research highlights the need for targeted health interventions due to the significant variations in CVD burden across different regions in Asia.
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This study examined the benefits of an intergenerational home-based service learning program to reduce psychological distress for homebound older adults. Multivariate regression analyses were conducted with a sample of 182 to examine the association of length of service from the program and presence of caregivers with psychological distress. Findings indicated length of service (β = -0.

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  • The study focuses on first-line treatments for metastatic urothelial carcinoma of the bladder, involving either platinum-based chemotherapy, PD1/L1 inhibitors, or a combination of both; real-world data was used to analyze treatment factors and overall survival.
  • Researchers analyzed 4,169 patients diagnosed between 2014 and 2018 using the National Cancer Database, determining that older patients and those with more comorbidities were more likely to receive immunotherapy.
  • Findings indicated that combination chemoimmunotherapy improved overall survival compared to chemotherapy alone, especially in patients treated at academic facilities.
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  • - Research on precancers is crucial because early intervention is more effective for treatment, focusing on at-risk tissues and early lesions.
  • - There is a need for risk stratification to avoid overtreatment, highlighting the importance of genetic and epigenetic aging in assessing risk levels.
  • - Effective intervention and health policy strategies should integrate both macroenvironmental risk factors and the molecular and cellular aspects of lesions and at-risk tissues.
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T cell-based immunotherapies have exhibited promising outcomes in tumor control; however, their efficacy is limited in immune-excluded tumors. Cancer-associated fibroblasts (CAFs) play a pivotal role in shaping the tumor microenvironment and modulating immune infiltration. Despite the identification of distinct CAF subtypes using single-cell RNA-sequencing (scRNA-seq), their functional impact on hindering T-cell infiltration remains unclear, particularly in soft-tissue sarcomas (STS) characterized by low response rates to T cell-based therapies.

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Skeleton-based exercise assessment focuses on evaluating the correctness or quality of an exercise performed by a subject. Skeleton data provide two groups of features (i.e.

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  • * An indirect comparison study was conducted to evaluate the effectiveness of brexu-cel against pirtobrutinib, using patient data to account for various prognostic factors, including disease stage and prior treatments.
  • * Results indicated that brexu-cel led to significantly higher response rates and improved progression-free survival compared to pirtobrutinib, suggesting it might be a more effective treatment option for this patient population.
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The ) partnership trains undergraduate social work students to provide practical home-based support for older adults with chronic illness and their family caregivers, serving as a pipeline for future leaders in older adult care. More than 2 million older adults are homebound, and 5 million need help leaving their homes due to physical limitations from chronic conditions or cognitive impairments. Family members often assume daily caregiving tasks to assist their loved ones, navigate health care systems, and provide much needed emotional support.

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Colorectal cancer exhibits dynamic cellular and genetic heterogeneity during progression from precursor lesions toward malignancy. Analysis of spatial multi-omic data from 31 human colorectal specimens enabled phylogeographic mapping of tumor evolution that revealed individualized progression trajectories and accompanying microenvironmental and clonal alterations. Phylogeographic mapping ordered genetic events, classified tumors by their evolutionary dynamics, and placed clonal regions along global pseudotemporal progression trajectories encompassing the chromosomal instability (CIN+) and hypermutated (HM) pathways.

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Introduction: Elective pelvic nodal irradiation for patients with muscle-invasive bladder cancer (MIBC) undergoing trimodal therapy (TMT ) is controversial. In patients with node-negative (N0) MIBC, the benefit of elective whole-pelvis concurrent chemoradiation (WP-CCR) compared to bladder-only (BO )-CCR has not been demonstrated. Using real-world data from the National Cancer Database (NCDB ), we sought to compare the overall survival (OS ) between BO-CCR and WP-CCR for MIBC.

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Objective: Bacterial loads can be effectively reduced using cavitation-mediated focused ultrasound, or histotripsy. In this study, gram-negative bacteria (Escherichia coli) in suspension were used as model bacteria to evaluate the effectiveness of two regimens of histotripsy treatments: cavitation histotripsy (CH) and boiling histotripsy (BH).

Methods: Ten-milliliter volumes of Escherichia coli were treated at different negative focal pressure amplitudes and over time periods up to 40 min.

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Objectives: In randomized-controlled crossover design trials, overall survival (OS) treatment effect estimates are often confounded by the control group benefiting from treatment received post-progression. We estimated the adjusted OS treatment effect in EMPOWER-Lung 1 (NCT03088540) by accounting for the potential impact of crossover to cemiplimab among controls and continued cemiplimab treatment post-progression.

Methods: Patients were randomly assigned 1:1 to cemiplimab 350 mg every 3 weeks (Q3W) or platinum-doublet chemotherapy.

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Objective: Co-prevalence and incidence of depression and/or anxiety with stroke and myocardial infarction are currently unclear. This paper explores the relationships, as these are important comorbidities affecting patient outcomes.

Methods: A systematic search across five databases (PubMed, Scopus, PsycINFO, Embase, Cochrane) was conducted for observational studies reporting co-prevalence of depression or anxiety with stroke or myocardial infarction.

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Objectives: Network meta-analysis (NMA) of time-to-event outcomes based on constant hazard ratios can result in biased findings when the proportional hazards (PHs) assumption does not hold in a subset of trials. We aimed to summarize the published non-PH NMA methods for time-to-event outcomes, demonstrate their application, and compare their results.

Methods: The following non-PH NMA methods were compared through an illustrative case study in oncology of 4 randomized controlled trials in terms of progression-free survival and overall survival: (1) 1-step or (2) 2-step multivariate NMAs based on traditional survival distributions or fractional polynomials, (3) NMAs with restricted cubic splines for baseline hazard, and (4) restricted mean survival NMA.

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Exonic circular RNAs (circRNAs) produce predominantly non-coding RNA species that have been recently profiled in many tumors. However, their functional contribution to cancer progression is still poorly understood. Here, we identify the circRNAs expressed in soft tissue sarcoma cells and explore how the circRNAs regulate sarcoma growth in vivo.

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This study sought to investigate the impact of pre-existing cognitive impairment on outcomes after transcatheter aortic valve implantation (TAVI). TAVI has been increasingly used in seniors, and evidence suggests better outcomes than surgical aortic valve replacement. Although frailty has been shown to be associated with poorer outcomes after TAVI, the effect of pre-existing cognitive impairment on patient outcomes after TAVI remains unclear.

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In the absence of a randomized head-to-head trial, an unanchored matching-adjusted indirect comparison was performed to estimate the relative treatment effects of axicabtagene ciloleucel (axi-cel; ZUMA-1) versus lisocabtagene maraleucel (liso-cel; TRANSCEND-NHL-001) for treatment of relapsed/refractory (R/R) large B-cell lymphoma (LBCL) after at least two lines of therapy. After matching, axi-cel and liso-cel had comparable objective response rates and duration. Compared to liso-cel, axi-cel was associated with improvements in overall survival (hazard ratio [HR]: 0.

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Background: Anti-programmed cell death 1 (anti-PD-1) and PD ligand 1 (PD-L1) immune checkpoint therapies (ICTs) provided durable responses only in a subset of cancer patients. Thus, biomarkers are needed to predict nonresponders and offer them alternative treatments. We recently implicated discoidin domain receptor tyrosine kinase 2 (DDR2) as a contributor to anti-PD-1 resistance in animal models; therefore, we sought to investigate whether this gene family may provide ICT response prediction.

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Bladder cancer is a prevalent but currently understudied cancer type and patient outcomes are poor when it progresses to the muscle-invasive stage. Current research in bladder cancer focuses on the genetic and epigenetic alterations occurring within the urothelial cell compartment; however, the stromal compartment receives less attention. Dynamic changes and intercellular communications occur in the tumour microenvironment (TME) of the bladder - a new concept and niche that we designate as the bladder TME (bTME) - during tumour evolution, metastatic progression and in the context of therapeutic response.

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  • The study focuses on evaluating the effectiveness of cemiplimab, an immune-oncology therapy, for treating advanced non-small-cell lung cancer (NSCLC) with high PD-L1 expression, comparing it to pembrolizumab and other therapies in clinical trials from 2010-2020.
  • A systematic review and network meta-analysis were conducted, indicating that cemiplimab significantly improves progression-free survival (PFS) and objective response rate (ORR) compared to pembrolizumab, while showing comparable overall survival (OS) rates.
  • The analysis revealed no significant differences in severe adverse events between cemiplimab and pembrolizumab, suggesting similar safety profiles for both treatments
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