Publications by authors named "Victor Chen"

Chromatin remodeling complexes, such as the SWItch/Sucrose Non-Fermentable (SWI/SNF) complex, play key roles in regulating gene expression by modulating nucleosome positioning. The core subunit SMARCB1 is essential for these functions, as it anchors the complex to the nucleosome acidic patch, enabling effective chromatin remodeling. While biallelic inactivation of is a hallmark of several aggressive pediatric malignancies, the functional implication of missense mutations is not fully understood.

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This paper introduces the Team Card (TC) as a protocol to address harmful biases in the development of clinical artificial intelligence (AI) systems by emphasizing the often-overlooked role of researchers' positionality. While harmful bias in medical AI, particularly in Clinical Decision Support (CDS) tools, is frequently attributed to issues of data quality, this limited framing neglects how researchers' worldviews-shaped by their training, backgrounds, and experiences-can influence AI design and deployment. These unexamined subjectivities can create epistemic limitations, amplifying biases and increasing the risk of inequitable applications in clinical settings.

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Macrophages hold tremendous promise as effectors of cancer immunotherapy, but the best strategies to provoke these cells to attack tumors remain unknown. Here, we evaluated the therapeutic potential of targeting two distinct macrophage immune checkpoints: CD47 and CD24. We found that antibodies targeting these antigens could elicit maximal levels of phagocytosis when combined together in vitro.

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Tumor progression is driven by dynamic interactions between cancer cells and their surrounding microenvironment. Investigating the spatiotemporal evolution of tumors can provide crucial insights into how intrinsic changes within cancer cells and extrinsic alterations in the microenvironment cooperate to drive different stages of tumor progression. Here, we integrate high-resolution spatial transcriptomics and evolving lineage tracing technologies to elucidate how tumor expansion, plasticity, and metastasis co-evolve with microenvironmental remodeling in a -driven mouse model of lung adenocarcinoma.

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Introduction: Renal parenchymal volume loss from standard partial nephrectomy (SPN) is a significant prognosticator for postoperative renal function. Tumor enucleation (TE) minimizes parenchymal loss compared to SPN. Little is known regarding discrete changes in renal function associated with volume loss.

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Objective: Compare the real-world impact of fidaxomicin (FDX) and vancomycin (VAN) on infection (CDI) recurrence in a high-risk patient population.

Design: A retrospective, matched-cohort study evaluating hospitalized patients with CDI from January 1, 2016, to November 1, 2022, within a tertiary academic medical center.

Patients: Adult patients with at least 1 prior CDI case who received either FDX or VAN for non-fulminant CDI while admitted, and had at least 1 additional risk factor for recurrence.

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Article Synopsis
  • - Migration and homing of immune cells are essential for effective immune surveillance, guided by specific receptors and chemokine signals to reach target tissues and lymphatic regions.
  • - The study reveals that the lack of leukemia inhibitory factor (LIF) from group 2 innate lymphoid cells (ILC2s) hinders immune cells from leaving the lungs, affecting their ability to migrate to lymph nodes during viral infections and chronic allergen challenges.
  • - ILC2-derived LIF enhances the production of the chemokine CCL21 in lymphatic vessels, which is crucial for directing immune cells to lymph nodes, thereby influencing the balance between local immune responses in the lungs versus systemic immunity.
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Background: This Site Feasibility Task Force convened to assess the complex and burdensome process of site feasibility in clinical trials. The objective was to create mutual understanding of challenges and provide suggestions for improving collaboration among sponsors, contract research organizations (CROs), and sites.

Methods: The task force was composed of representatives from sponsors, CROs and sites (43 % Sites, 20 % Site Networks, 10 % Small/mid-size sponsors, 10 % Small/mid-size CROs, 10 % Large sponsors, 7 % Large CROs).

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Background: The link between the prostate microbiome and prostate cancer remains unclear. Few studies have analyzed the microbiota of prostate tissue, and these have been limited by potential contamination by transrectal biopsy. Transperineal prostate biopsy offers an alternative and avoids fecal cross-contamination.

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Article Synopsis
  • Significant advancements have been made in using data from smartphones and wearables to track depressive moods over the past decade, but many studies struggle with replicability and validity of depression measures.
  • This study involved 183 individuals and combined adaptive testing with continuous behavioral data over 40 weeks, achieving high prediction accuracy of future mood based on digital data.
  • The findings demonstrate the potential for more personalized behavioral assessments in mental health research, allowing for predictions of symptom severity weeks ahead.
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We aim to compare complications, readmission, survival, and prescribing patterns of opioids for post-operative pain management for Robotic-assisted laparoscopic radical cystectomy (RARC) as compared to open radical cystectomy (ORC). Patients that underwent RARC or ORC for bladder cancer at a tertiary care center from 2005 to 2021 were included. Recurrence-free survival (RFS) and overall survival (OS) were evaluated with Kaplan-Meier curves and multivariable Cox proportional hazards regression models.

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The opioid crisis has become a significant public health concern in recent years. Although respiratory depression and overdose are the most reported side effects of fentanyl, there have been rare cases of cerebellar leukoencephalopathy (CLE) following fentanyl intoxication. A 29-year-old man with a history of opioid use disorder and intravenous drug use presented to the emergency room with significant ataxia and dysarthria following fentanyl intoxication.

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Nitrous oxide is a potent greenhouse gas and ozone-depleting agent with a long atmospheric lifetime. Several previous reports indicate that over half of supplied nitrous oxide is wasted from leaking manifold-pipeline systems infrastructure prior to patient use, and that remediating leaks can have significant environmental benefits. We describe an accurate, simple and cost-effective cylinder weighing method to quantify nitrous oxide leak from the manifold-pipeline network at our tertiary non-obstetric facility.

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Introduction: We aimed to assess utilization of neoadjuvant chemotherapy (NAC) and etiologies for lack of NAC receipt among patients with muscle-invasive bladder cancer (MIBC).

Methods: Patients diagnosed with MIBC undergoing radical cystectomy at a single institution (2005-2021) were included. Patients were categorized by receipt of NAC, and reasons for no NAC were categorized into eligibility and elective factors.

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Abnormal gait is a significant non-cognitive biomarker for Alzheimer's disease (AD) and AD-related dementia (ADRD). Micro-Doppler radar, a non-wearable technology, can capture human gait movements for potential early ADRD risk assessment. In this research, we propose to design STRIDE integrating micro-Doppler radar sensors with advanced artificial intelligence (AI) technologies.

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Article Synopsis
  • Patients with multiple brain metastases typically have a survival rate of less than 2 years, and the impact of treatment on their quality of life is a critical consideration for clinicians.
  • Three radiation treatments are evaluated: Whole Brain Radiation Therapy (WBRT), Hippocampal Avoidance WBRT (HA-WBRT), and Stereotactic Radiosurgery (SRS), with WBRT being less expensive but associated with more severe side effects like memory loss.
  • The study found that SRS is cost-effective compared to WBRT, while HA-WBRT is not; recommending SRS for treatment can improve patient care and reduce healthcare costs.
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The microbiota generates diverse metabolites to modulate host physiology and disease, but their protein targets and mechanisms of action have not been fully elucidated. To address this challenge, we explored microbiota-derived indole metabolites and developed photoaffinity chemical reporters for proteomic studies. We identified many potential indole metabolite-interacting proteins, including metabolic enzymes, transporters, immune sensors and G protein-coupled receptors.

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Y-box binding protein 1 (YBX1 or YB1) is a therapeutically relevant oncoprotein capable of RNA and DNA binding and mediating protein-protein interactions that drive proliferation, stemness, and resistance to platinum-based therapies. Given our previously published findings, the potential for YB1-driven cisplatin resistance in medulloblastoma (MB), and the limited studies exploring YB1-DNA repair protein interactions, we chose to investigate the role of YB1 in mediating radiation resistance in MB. MB, the most common pediatric malignant brain tumor, is treated with surgical resection, cranio-spinal radiation, and platinum-based chemotherapy, and could potentially benefit from YB1 inhibition.

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Background: Pre-exposure prophylaxis for COVID-19 with tixagevimab/cilgavimab (T/C) received Emergency Use Authorization (EUA) based on results of a clinical trial conducted prior to the emergence of the Omicron variant. The clinical effectiveness of T/C has not been well described in the Omicron era. We examined the incidence of symptomatic illness and hospitalizations among T/C recipients when Omicron accounted for virtually all local cases.

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Nanofiber-porous systems comprising a porous substrate overlaid with nanofiber weave offer the potential for higher acoustic absorption than the substrate alone with negligible increase in thickness. The characterization of nanofibers from acoustic measurements is investigated in this work, and a regression model for predicting their acoustic properties from a single physical parameter is proposed to enable the design of nanofiber-porous systems directly from fabrication parameters. Characterization as a resistive screen via Johnson-Champoux-Allard and lumped element models for transfer matrix computations of absorption coefficient for nanofiber-porous systems exhibited good agreement with the measured spectra.

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Bile acids are important gut microbiota metabolites that regulate both host and microbial functions. To identify the direct protein targets of bile acids in , we synthesized and validated the activity of a lithocholic acid (LCA) photoaffinity reporter, x-alk-LCA-3. Chemical proteomics of x-alk-LCA-3 in Com15 reveals many candidate LCA-interacting proteins, which are involved in cell well synthesis, transcriptional regulation and metabolism.

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Introduction: Physicians assume leadership roles in their health care organizations and practices often without support or training. The Physicians Leadership Academy provides integrated leadership seminars, mindfulness training, and executive coaching in a 10-month curriculum to physicians across area organizations.

Methods: Program evaluators responded to stakeholders' need for continuous program improvement by developing a continuous feedback loop evaluation design incorporating a program monitoring system and a theory-driven program evaluation.

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