Publications by authors named "Wittes J"

Efficient evidence generation to assess the clinical and economic impact of medical therapies is critical amid rising healthcare costs and aging populations. However, drug development and clinical trials remain far too expensive and inefficient for all stakeholders. On October 25-26, 2023, the Duke Clinical Research Institute brought together leaders from academia, industry, government agencies, patient advocacy, and nonprofit organizations to explore how different entities and influencers in drug development and healthcare can realign incentive structures to efficiently accelerate evidence generation that addresses the highest public health needs.

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A Flexon stop cassette interrupts translation of a coding region until it is excised by a recombinase to allow for gene expression. We have expanded options for Auxin-Inducible Degradation by generating Flexon-based transgenes for tissue-specific expression of the ubiquitin ligase substrate recognition component TIR1 or the variant TIR1(F79G) after excision of the Flexon by Cre recombinase. We also describe Flexon-based tester transgenes to facilitate gathering accurate information about the expression pattern of Cre and Flp recombinase drivers that can be used in conjunction with any conditional expression reagents that utilize these recombinases.

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AbstractClinical trials investigating novel or high-risk interventions often use data monitoring committees (DMCs) to ensure that the participants' best interests are safeguarded. The typical DMC charter describes procedures by which the DMC operates, including important details concerning organizational structure, membership, meeting frequency, statistical monitoring guidelines, and contents of DMC reports for interim review. These charters, however, are not routinely publicly available; in some cases, their access could be important to the interpretation of trial results.

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Clinical trials are vital for assessing therapeutic interventions. The associated data monitoring committees (DMCs) safeguard patient interests and enhance trial integrity, thus promoting timely, reliable evaluations of those interventions. We face an urgent need to recruit and train new DMC members.

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Clinical trials investigating novel or high risk interventions, or studying vulnerable participants, often use a data monitoring committee to oversee the progress of the trial. The data monitoring committee serves both an ethical and a scientific function, by protecting the interests of trial participants while ensuring the integrity of the trial results. A data monitoring committee charter, which typically describes the procedures by which data monitoring committees operate, contains details about the data monitoring committee's organizational structure, membership, meeting frequency, sequential monitoring guidelines, and the overall contents of data monitoring committee reports for interim review.

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In this commentary, we urge that a Data Monitoring Committee (DMC) should operate as a collective, that is, as a unitary whole. In so doing, its recommendations should emerge through a consensus development process, not through a vote of the members. The summary notes of its closed session, that is, its minutes, should report the recommendations of the DMC and, if necessary, the justification for those recommendations; it should not attribute opinions to individual members.

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The efficacy of a new molecule is assessed in the pharmaceutical industry through noninferiority tests to establish that it is not unacceptably less efficient than the reference. This method was proposed to compare DL-Methionine (DL-Met) as reference and DL-Hydroxy-Methionine (OH-Met) as alternative, in broiler chickens. The research hypothesized that OH-Met is inferior to DL-Met.

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Article Synopsis
  • The ASCEND-ND trial raised concerns about daprodustat having a higher risk of cancer-related adverse events compared to darbepoetin in patients with anemia due to chronic kidney disease (CKD), but this was not seen in the dialysis-focused ASCEND-D trial.* -
  • Both trials involved randomizing patients to receive either daprodustat or various types of erythropoiesis-stimulating agents (ESAs), with different dosing schedules, and used statistical models to analyze the safety of the treatments.* -
  • The findings indicated that the perceived increased risk of cancer-related adverse events for daprodustat in ASCEND-ND may have been biased due to under-counting of events in the darbepo
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The Heart Failure Academic Research Consortium is a partnership between the Heart Failure Collaboratory (HFC) and the Academic Research Consortium (ARC) composed of patients, academic investigators from the United States and Europe, the U.S. Food and Drug Administration, the National Institutes of Health, payers, and industry.

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Aim: To inform the oversight of future clinical trials during a pandemic, we summarise the experiences of the Data Monitoring Committee (DMC) for the Randomised Evaluation of COVID therapy trial (RECOVERY), a large-scale randomised adaptive platform clinical trial of treatments for hospitalised patients with COVID-19.

Methods And Findings: During the first 24 months of the trial (March 2020 to February 2022), the DMC oversaw accumulating data for 14 treatments in adults (plus 10 in children) involving > 45,000 randomised patients. Five trial aspects key for the DMC in performing its role were: a large committee of members, including some with extensive DMC experience and others who had broad clinical expertise; clear strategic planning, communication, and responsiveness by the trial principal investigators; data collection and analysis systems able to cope with phases of very rapid recruitment and link to electronic health records; an ability to work constructively with regulators (and other DMCs) to address emerging concerns without the need to release unblinded mortality results; and the use of videoconferencing systems that enabled national and international members to meet at short notice and from home during the pandemic when physical meetings were impossible.

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The mammalian tumor suppressor PTEN has well-established lipid phosphatase and protein phosphatase activities. DAF-18, the Caenorhabditis elegans ortholog of PTEN, has a high degree of conservation in the catalytic domain, and human PTEN complements a null allele of daf-18, suggesting conserved protein function. Insights gleaned from studies of mammalian PTEN have been applied to studies of DAF-18 in C.

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Currently, too many Data Monitoring Committee Reports for interim review of trial progress are quite inadequate for Data Monitoring Committees to make informed decisions about risks and benefits. Immediate serious improvement is necessary for Data Monitoring Committees to meet their ethical, clinical, and scientific responsibility to trial participants, investigators, sponsors, and participating institutions. To achieve this critical goal, all parties involved in the Data Monitoring Committee process including sponsors, investigators, Data Monitoring Committee members, and the independent statistical reporting group need to have a better understanding of the structure, function, and needs of a Data Monitoring Committee and the content of a Data Monitoring Committee Report.

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Importance: Extenuating circumstances can trigger unplanned changes to randomized trials and introduce methodological, ethical, feasibility, and analytical challenges that can potentially compromise the validity of findings. Numerous randomized trials have required changes in response to the COVID-19 pandemic, but guidance for reporting such modifications is incomplete.

Objective: As a joint extension for the CONSORT and SPIRIT reporting guidelines, CONSERVE (CONSORT and SPIRIT Extension for RCTs Revised in Extenuating Circumstances) aims to improve reporting of trial protocols and completed trials that undergo important modifications in response to extenuating circumstances.

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Article Synopsis
  • Vadadustat is a medication that stimulates the production of erythropoietin, helping treat anemia in patients with chronic kidney disease on dialysis.
  • Two large phase 3 trials compared its safety and effectiveness to darbepoetin alfa, focusing on cardiovascular events and hemoglobin levels over time.
  • Results showed similar rates of major adverse cardiovascular events between the two treatments, but vadadustat led to slightly lower increases in hemoglobin levels in both incident and prevalent dialysis-dependent chronic kidney disease patients.
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  • * The study involved two large Phase 3 clinical trials focusing on patients with low hemoglobin levels; the main goal was to assess the safety of vadadustat compared to darbepoetin, specifically looking at major cardiovascular events.
  • * Results showed that vadadustat did not meet the safety benchmark compared to darbepoetin, as indicated by a higher hazard ratio for major adverse cardiovascular events, and there was minimal difference in hemoglobin improvement between the two treatments.
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The treatment of heart failure with reduced ejection fraction (HFrEF) has changed considerably over time, particularly with the sequential development of therapies aimed at antagonism of maladaptive biologic pathways, including inhibition of the sympathetic nervous system and the renin-angiotensin aldosterone system. The sequential nature of earlier HFrEF trials allowed the integration of new therapies tested against the background therapy of the time. More recently, multiple heart failure therapies are being evaluated simultaneously, and the number of therapeutic choices for treating HFrEF has grown considerably.

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Importance: Influenza is temporally associated with cardiopulmonary morbidity and mortality among those with cardiovascular disease who may mount a less vigorous immune response to vaccination. Higher influenza vaccine dose has been associated with reduced risk of influenza illness.

Objective: To evaluate whether high-dose trivalent influenza vaccine compared with standard-dose quadrivalent influenza vaccine would reduce all-cause death or cardiopulmonary hospitalization in high-risk patients with cardiovascular disease.

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The coronavirus disease-2019 (COVID-19) pandemic has profoundly changed clinical care and research, including the conduct of clinical trials, and the clinical research ecosystem will need to adapt to this transformed environment. The Heart Failure Academic Research Consortium is a partnership between the Heart Failure Collaboratory and the Academic Research Consortium, composed of academic investigators from the United States and Europe, patients, the U.S.

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Article Synopsis
  • Current guidelines recommend using erythropoiesis-stimulating agents (ESAs) for managing anemia in patients with non-dialysis-dependent chronic kidney disease (NDD-CKD), with vadadustat being an investigational oral treatment that boosts erythropoietin production.
  • The PROTECT program consists of two Phase 3 clinical trials comparing the safety and efficacy of vadadustat to darbepoetin alfa in adult patients with anemia due to NDD-CKD, focusing on different patient groups based on their prior ESA treatment status.
  • Both trials assess primary outcomes like changes in hemoglobin levels and major cardiovascular events over defined treatment periods, aiming to provide valuable insights into vadadustat's role in
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