Publications by authors named "Kenneth D Chavin"

This phase 3 multicenter, randomized, controlled clinical trial evaluated investigational cellular product (MDR-101) to produce immune tolerance vs standard of care, in kidney transplant recipients. Adult recipients of kidneys from 2-haplotype human leukocyte antigen-matched living siblings were randomized 2:1 to treatment (n = 20) or control (n = 10). The MDR-101 product was from the same kidney donor.

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Background And Aims: Effective approaches for prevention of hepatocellular carcinoma (HCC) will have a significant impact on HCC-related mortality. There are strong preclinical data and rationale to support targeting epidermal growth factor receptor (EGFR) for HCC chemoprevention. Small molecule inhibitors of EGFR have been Food and Drug Administration-approved for cancer therapy, which provides an opportunity to repurpose one of these drugs for chemoprevention of HCC.

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Article Synopsis
  • Donor-derived cell-free DNA (dd-cfDNA) is an innovative noninvasive biomarker being studied for its ability to detect kidney allograft injuries, such as rejection.
  • In a study involving 2,882 kidney transplant recipients, high levels of dd-cfDNA were strongly linked to various types of allograft rejection, and it significantly improved prediction models beyond what's typically used in patient monitoring.
  • The study, which included diverse cohorts, reinforced that measuring dd-cfDNA could enhance the detection of even subtle rejection in stable patients, providing valuable insights for better transplant management.
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  • Deep learning models used for predicting disease risks face challenges like time-varying factors, rare cases, imbalanced data, and delayed diagnoses, especially in complex conditions like hepatocellular carcinoma related to nonalcoholic fatty liver disease.
  • This study analyzed the performance of deep learning models on a large patient cohort from electronic health records and focused on refining prediction strategies to deal with delayed diagnoses and covariate imbalance.
  • Key findings included the effectiveness of modeling time-varying data, the positive impact of transfer learning on data scarcity, and the negative effects of sex bias, highlighting the need for balanced data in training.
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  • Deep learning models have proven effective in biomedical applications but face challenges like time-varying data, rare occurrences, and imbalances in covariates, especially when predicting one disease related to another, as seen with hepatocellular carcinoma in patients with nonalcoholic fatty liver disease.
  • This study aims to explore how these factors impact model performance and to develop strategies that enhance disease risk prediction.
  • The researchers used two deep learning models on a large dataset to demonstrate that addressing time-varying covariates and implementing transfer learning can improve prediction accuracy, revealing that sex bias significantly affects model performance.
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Background: Partial hepatectomy is a preferred treatment option for many patients with hepatocellular carcinoma however, pre-existing pathological abnormalities originating from hepatic steatosis can alter the decision to perform surgery or postoperative outcomes as a consequence of the impact steatosis has on liver regeneration.

Aim: The aim of this study was to investigate the role of a saturated or unsaturated high fat diet-mediated steatosis on liver regeneration following partial hepatectomy.

Methods: Mice were fed a low-fat control diet (CD, 13% fat), lard-based unsaturated (LD, 60% fat) or milk-based saturated high fat diet (MD, 60% fat) for 16 weeks at which time partial hepatectomy (approx.

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Background: We examined the association between Medicaid expansion (ME) and the diagnosis, treatment, and survival of patients with hepatocellular carcinoma (HCC).

Methods: We identified patients with HCC <65yrs with Medicaid or without insurance within the National Cancer Database before (2010-2013) or after (2015-2017) ME with early (cT1) or intermediate/advanced (cT2-T4 or M1) disease.

Results: We identified 4848 patients with HCC before and 4526 after ME.

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Background: We describe factors associated with trial enrollment for patients with hepato-pancreato-biliary (HPB) malignancies. We analyzed the association and effect of trial enrollment on overall survival (OS).

Methods: The National Cancer Database (2004-2017) was queried for common HPB malignancies (pancreatic adenocarcinoma [PDAC] & neuroendocrine tumors, hepatocellular carcinoma [HCC], biliary tract cancers [BTC]).

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Background: Hepatocellular carcinoma (HCC) is a leading cause of cancer mortality. Operative management of early disease includes ablation, resection, and transplantation. We compared the operative management of early-stage HCC in patients stratified by race.

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Background Limited literature exists that evaluated outcomes of kidney transplant-eligible patients who are having dialysis and who are undergoing valve replacement. Our main objective in this study was to compare mortality, reoperation, and bleeding episodes between bioprosthetic and mechanical valve procedures among kidney transplant-eligible patients who are having dialysis. Methods and Results We studied 887 and 1925 dialysis patients from the United States Renal Data System, who underwent mitral valve replacement and aortic valve replacement (AVR) after being waitlisted for a kidney transplant (2000-2015), respectively.

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Background: The main surgical approach to patients with localized intrahepatic cholangiocarcinoma (ICC) is hepatectomy, but transplantation has been described. A comparison of outcomes between these surgical approaches is necessary to determine if one is preferable.

Methods: Patients with ICC were identified using the National Cancer Database (2010-2016).

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Background: Improved chemotherapy response rates have lead to "disappearing" colorectal liver metastases (dCRLM). We aim to assess management patterns of dCRLM from an international body of hepatobiliary surgeons.

Methods: A survey was designed, tested for item relevance, readability and content validity, and distributed to the AHPBA, IHPBA and ANZHPBA.

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Background And Aims: Coronavirus disease 2019 (COVID-19) is associated with liver injury, but the prevalence and patterns of liver injury in liver transplantation (LT) recipients with COVID-19 are open for study.

Approach And Results: We conducted a multicenter study in the United States of 112 adult LT recipients with COVID-19. Median age was 61 years (interquartile range, 20), 54.

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Background & Aims: Chronic liver disease (CLD) represents a major global health burden. We undertook this study to identify the factors associated with adverse outcomes in patients with CLD who acquire the novel coronavirus-2019 (COVID-19).

Methods: We conducted a multi-center, observational cohort study across 21 institutions in the United States (US) of adult patients with CLD and laboratory-confirmed diagnosis of COVID-19 between March 1, 2020 and May 30, 2020.

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Background: Bilio-enteric diversion is the current surgical standard in patients after deceased donor liver transplantation (DDLT) with a biliary anastomotic stricture failing interventional treatment and requiring surgical repair. In contrast to this routine, the aim of this study was to show the feasibility and safety of a duct-to-duct biliary reconstruction.

Patients: Between 2012 and 2019, we performed a total of 308 DDLT in 292 adult patients.

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Nonalcoholic steatohepatitis (NASH) is a form of fatty liver disease where benign hepatic steatosis leads to chronic inflammation in the steatotic liver of a patient without any history of alcohol abuse. Mechanisms underlying the progression of hepatic steatosis to NASH have long been investigated. This review outlines the potential role of peroxisomal dysfunctions in exacerbating the disease in NASH.

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Article Synopsis
  • Post-reperfusion syndrome (PRS) can range from mild to severe during liver transplantation, affecting patient outcomes due to various factors.
  • A study found that using a blood flush through a caval vent alongside the standard chilled flush may lead to less hemodynamic instability and fewer metabolic issues.
  • Results showed that patients who received the caval flush experienced better mean arterial pressure and heart rate retention, although central venous pressure and lab values were similar between groups, indicating a potential benefit of the technique that warrants further research.
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Objective: To assess the safety and benefits of new techniques and technologies such as single-dose (del Nido) cardioplegia and suture fasteners (COR-KNOT) in patients undergoing mini-thoracotomy for degenerative mitral valve repair (MVR).

Methods: From 2009 to 2016, 252 patients underwent primary isolated degenerative MVR by mini-thoracotomy by a single surgeon. Del Nido cardioplegia was used in 153 patients (61%) and COR-KNOT in 168 (67%).

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Background: There are only a limited number of studies that have sought to identify patients at high risk for medication errors and subsequent adverse clinical outcomes. This study sought to identify risk factors for increased health care resource utilization in kidney transplant recipients based on drug-related problems and self-administered surveys.

Methods: In this prospective observational study, adult kidney transplant recipients seen in the transplant clinic between September and November 2015 were surveyed for self-reported demographics, medication adherence, and health status/outlook.

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Background: With the advent of effective antivirals against cytomegalovirus (CMV), use of CMV hyperimmune globulin (HIG) has decreased. Although antiviral prophylaxis in patients at high risk for CMV is effective, many patients still have late infection, never developing antibodies sufficient to achieve immunity. Utilizing a combination of antiviral and CMV HIG may allow patients to achieve immunity and decrease late CMV infections.

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Complement plays a role in both hepatic ischemia reperfusion (IR) injury (IRI) and liver regeneration, but it is not clear how complement is activated in either process. We investigated the role of self-reactive immunoglobulin M (IgM) antibodies in activating complement after hepatic IR and liver resection. Natural IgM antibodies that recognize danger-associated molecular patterns (neoepitopes) activate complement following both hepatic IR and liver resection.

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Purpose: To describe the rationale, methodology, design, and interventional approach of a mobile health education program designed for African Americans with end stage renal disease (ESRD) to increase knowledge and self-efficacy to approach others about their need for a living donor kidney transplant (LDKT).

Methods: The Living Organ Video Educated Donors (LOVED) program is a theory-guided iterative designed, mixed methods study incorporating three phases: 1) a formative evaluation using focus groups to develop program content and approach; 2) a 2-month proof of concept trial (n=27) to primarily investigate acceptability, tolerability and investigate increases of LDKT knowledge and self-efficacy; and 3) a 6-month, 2-arm, 60-person feasibility randomized control trial (RCT) to primarily investigate increases in LDKT knowledge and self-efficacy, and secondarily, to increase the number of living donor inquiries, medical evaluations, and LDKTs. The 8-week LOVED program includes an interactive web-based app delivered on 10″ tablet computer incorporating weekly interactive video education modules, weekly group video chat sessions with an African American navigator who has had LDKT and other group interactions for support and improve strategies to promote their need for a kidney.

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Background: This study evaluated the impact of body mass index (BMI) and patient functional status on the risk for surgical complications after kidney transplant.

Methods: This retrospective cohort study of adult kidney transplant recipients grouped patients by baseline Karnofsky status (low function ≤ 70%) and further stratified by morbid obesity (BMI ≥ 35 kg/m) to assess surgical complication risk.

Results: 736 patients were included with surgical complications occurring in 25%.

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Left ventricular dysfunction resulting in cardiogenic shock occurs infrequently following organ reperfusion in liver transplantation. The etiology of the cardiogenic shock is often multifactorial and difficult to manage due to the complex nature of the procedure and the patient's baseline physiology. Traditionally, this hemodynamic instability is managed medically using inotropic agents and vasopressor support.

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