e-ISSN: Pending

Browse the failure-mode index

11,287 real negative results, null findings, and replication failures in Medicine · Negative / Null Result Report. Search the index →

WASTE indexes published research — it does not host or republish full papers. Each entry is a metadata record compiled from open scholarly databases; the abstract is shown in full only where the paper is openly licensed, otherwise a short excerpt under fair use. Classifications are automated and approximate.

Negative / Null Result ReportOpen accessMedicine

Advanced Intrahepatic Cholangiocarcinoma: Post Hoc Analysis of the ABC-01, -02, and -03 Clinical Trials

Ángela Lamarca, Paul J. Ross, Harpreet Wasan et al. · 2019 · JNCI Journal of the National Cancer Institute

BACKGROUND: The incidence of intrahepatic cholangiocarcinoma (iCCA) is increasing. The aim of the study was to provide reference survival data for patients with advanced iCCA treated with first-line cisplatin-gemcitabine chemotherapy (current standard of care). METHODS: Individual data from patients with iCCA recruited into the prospective, random assignment Advanced Biliary Tract Cancer (ABC)-01, -02, and -03 studies were retrieved. The prevalence and survival of liver-only iCCA was also assessed. Survival analysis was performed using univariate and multivariable Cox regression. All statistic

View details →
Negative / Null Result ReportOpen accessMedicine

Predicting Outcome of Endovascular Treatment for Acute Ischemic Stroke: Potential Value of Machine Learning Algorithms

Hendrikus J. A. van Os, Lucas A. Ramos, Adam Hilbert et al. · 2018 · Frontiers in Neurology

Background: Endovascular treatment (EVT) is effective for stroke patients with a large vessel occlusion (LVO) of the anterior circulation. To further improve personalized stroke care, it is essential to accurately predict outcome after EVT. Machine learning might outperform classical prediction methods as it is capable of addressing complex interactions and non-linear relations between variables. Methods: We included patients from the Multicenter Randomized Clinical Trial of Endovascular Treatment for Acute Ischemic Stroke in the Netherlands (MR CLEAN) Registry, an observational cohort of LVO

View details →
Negative / Null Result ReportOpen accessMedicine

Experimental Treatment of Ebola Virus Disease with TKM-130803: A Single-Arm Phase 2 Clinical Trial

Jake Dunning, Foday Sahr, Amanda Rojek et al. · 2016 · PLoS Medicine

BACKGROUND: TKM-130803, a small interfering RNA lipid nanoparticle product, has been developed for the treatment of Ebola virus disease (EVD), but its efficacy and safety in humans has not been evaluated. METHODS AND FINDINGS: In this single-arm phase 2 trial, adults with laboratory-confirmed EVD received 0.3 mg/kg of TKM-130803 by intravenous infusion once daily for up to 7 d. On days when trial enrolment capacity was reached, patients were enrolled into a concurrent observational cohort. The primary outcome was survival to day 14 after admission, excluding patients who died within 48 h of ad

View details →
Negative / Null Result ReportOpen accessMedicine

Hepatopulmonary syndrome: Favorable outcomes in the MELD exception era

Vivek Iyer, Karen L. Swanson, Rodrigo Cartin‐Ceba et al. · 2012 · Hepatology

UNLABELLED: Hepatopulmonary syndrome (HPS) is a pulmonary vascular disorder occurring as a consequence of advanced liver disease, characterized by hypoxemia due to intrapulmonary vascular dilatations. HPS independently increases mortality,…

View details →
Negative / Null Result ReportOpen accessMedicine

Amniotic fluid from healthy term pregnancies does not harbor a detectable microbial community

Efrem S. Lim, Cynthia Rodríguez, Lori R. Holtz · 2018 · Microbiome

Recent studies have conflicting data regarding the presence of intra-amniotic microbiota. Viral communities are increasingly recognized as important although overlooked components of the human microbiota. It is unknown if the developing fetus is exposed to a community of viruses (virome). Given the debate over the existence of an intra-amniotic microbial community and the importance of understanding how the infant gut is populated, we characterized the virome and bacterial microbiota of amniotic fluid from 24 uncomplicated term pregnancies using next-generation sequencing methods. Contrary to

View details →
Negative / Null Result ReportOpen accessMedicine

The sensitivity and specificity of optical coherence tomography for the assisted diagnosis of nonpigmented basal cell carcinoma: an observational study

Martina Ulrich, T. Braunmuehl, Hjalmar Kurzen et al. · 2015 · British Journal of Dermatology

BACKGROUND: The diagnostic criteria for basal cell carcinoma (BCC) using optical coherence tomography (OCT) have been described previously, but the clinical value of these findings remains unknown. OBJECTIVES: To investigate the diagnostic…

View details →
Negative / Null Result ReportOpen accessMedicine

Prospective Longitudinal Evaluation of the Effect of Deployment-Acquired Traumatic Brain Injury on Posttraumatic Stress and Related Disorders: Results From the Army Study to Assess Risk and Resilience in Servicemembers (Army STARRS)

Murray B. Stein, Ronald C. Kessler, Steven G. Heeringa et al. · 2015 · American Journal of Psychiatry

OBJECTIVE: Traumatic brain injury (TBI) is increasingly recognized as a risk factor for deleterious mental health and functional outcomes. The purpose of this study was to examine the strength and specificity of the association between…

View details →
Negative / Null Result ReportOpen accessMedicine

Impact of dose intensity of ponatinib on selected adverse events: Multivariate analyses from a pooled population of clinical trial patients

David J. Dorer, Ronald K. Knickerbocker, Michele Baccarani et al. · 2016 · Leukemia Research

Ponatinib is approved for adults with refractory chronic myeloid leukemia or Philadelphia chromosome-positive acute lymphoblastic leukemia, including those with the T315I BCR-ABL1 mutation. We pooled data from 3 clinical trials (N=671) to…

View details →
Negative / Null Result ReportOpen accessMedicine

Therapy of Small Cell Lung Cancer (SCLC) with a Topoisomerase-I–inhibiting Antibody–Drug Conjugate (ADC) Targeting Trop-2, Sacituzumab Govitecan

Jhanelle E. Gray, Rebecca S. Heist, Alexander Starodub et al. · 2017 · Clinical Cancer Research

Abstract Purpose: We evaluated a Trop-2–targeting antibody conjugated with SN-38 in metastatic small cell lung cancer (mSCLC) patients. Experimental Design: Sacituzumab govitecan was studied in patients with pretreated (median, 2; range,…

View details →
Negative / Null Result ReportOpen accessMedicine

Clinical outcome of a headache-specific multidisciplinary treatment program and adherence to treatment recommendations in a tertiary headache center: an observational study

Charly Gaul, Christina van Doorn, Nadine Webering et al. · 2011 · The Journal of Headache and Pain

This study investigated the outcome of a 5-day headache-specific multidisciplinary treatment program (MTP) and the adherence to treatment recommendations in 295 prospectively recruited consecutive headache patients [210 migraine, 17 tension-type headache (TTH), 68 combination headache, including 56 medication-overuse headache (MOH)]. Headache frequency decreased from 13.4 (±8.8) to 8.8 (±8.0) days per month after 12-18 months. Forty-three percent of the participants fulfilled the primary outcome (reduction of headache frequency of ≥50%), which was less likely in patients with combination of mi

View details →
Negative / Null Result ReportOpen accessMedicine

Lung Adenocarcinoma and Squamous Cell Carcinoma Gene Expression Subtypes Demonstrate Significant Differences in Tumor Immune Landscape

Hawazin Faruki, Gregory M. Mayhew, Jonathan S. Serody et al. · 2017 · Journal of Thoracic Oncology

INTRODUCTION: Molecular subtyping of lung adenocarcinoma (AD) and lung squamous cell carcinoma (SCC) reveal biologically diverse tumors that vary in their genomic and clinical attributes. METHODS: Published immune cell signatures and…

View details →
Negative / Null Result ReportOpen accessMedicine

Progression in the LRRK2-Associated Parkinson Disease Population

Rachel Saunders‐Pullman, Anat Mirelman, Roy N. Alcalay et al. · 2018 · JAMA Neurology

Importance: Few prospective longitudinal studies have evaluated the progression of Parkinson disease (PD) in patients with the leucine-rich repeat kinase 2 (LRRK2 [OMIM 609007]) mutation. Knowledge about such progression will aid clinical…

View details →
Negative / Null Result ReportOpen accessMedicine

Embodied health: the effects of a mind–body course for medical students

Allison Bond, Heather Mason, Chelsey Lemaster et al. · 2013 · Medical Education Online

OBJECTIVE: An effective career in medicine requires empathy and compassion, yet the demands of a medical education increase stress and decrease students' ability to connect with patients. However, research suggests mind-body practices improve psychological well-being. This study aimed to evaluate the psychological effects on medical students of an 11-week elective course, Embodied Health or EH, which combines yoga and meditation with neuroscience didactics. METHODS: The effects on 27 first- and second-year medical students were evaluated via surveys in four areas: empathy, perceived stress, se

View details →
Negative / Null Result ReportMedicine

The Keyhole Concept in Aneurysm Surgery: Results of the Past 20 Years

Gerrit Fischer, Axel Stadie, Róbert Reisch et al. · 2011 · Operative Neurosurgery

BACKGROUND: Improvements in preoperative imaging and intraoperative visualization have led to a refinement in surgical techniques. OBJECTIVE: Report of a 20-year experience with application of the keyhole technique as a contribution to the…

View details →
Negative / Null Result ReportMedicine

Low serum 25-hydroxyvitamin D levels are associated with increased all-cause mortality risk in a general population: the Tromsø study

Moira Strand Hutchinson, Guri Grimnes, Ragnar M. Joakimsen et al. · 2010 · European Journal of Endocrinology

OBJECTIVE: Ecologic and observational studies have suggested an association between serum 25-hydroxyvitamin D (25(OH)D) levels and cardiovascular disease (CVD) risk factors, CVD mortality, and cancer mortality. Based on this, low serum…

View details →
Negative / Null Result ReportOpen accessMedicine

The association between lactate, mean arterial pressure, central venous oxygen saturation and peripheral temperature and mortality in severe sepsis: a retrospective cohort analysis

Aletta P. I. Houwink, Saskia Rijkenberg, Rob J. Bosman et al. · 2016 · Critical Care

BACKGROUND: During resuscitation in severe sepsis and septic shock, several goals are set. However, usually not all goals are equally met. The aim of this study is to determine the relative importance of the different goals, such as mean arterial pressure (MAP), lactate, central venous oxygen saturation (ScvO2) and central to forefoot temperature (delta-T), and how they relate to intensive care unit (ICU) and hospital mortality. METHODS: In a retrospective cohort study in a 20-bed mixed medical and surgical ICU of a teaching hospital we studied consecutive critically ill patients who were admi

View details →
Negative / Null Result ReportOpen accessMedicine

Dementia Revealed: Novel Chromosome 6 Locus for Late-Onset Alzheimer Disease Provides Genetic Evidence for Folate-Pathway Abnormalities

Adam C. Naj, Gary W. Beecham, Eden R. Martin et al. · 2010 · PLoS Genetics

Genome-wide association studies (GWAS) of late-onset Alzheimer disease (LOAD) have consistently observed strong evidence of association with polymorphisms in APOE. However, until recently, variants at few other loci with statistically significant associations have replicated across studies. The present study combines data on 483,399 single nucleotide polymorphisms (SNPs) from a previously reported GWAS of 492 LOAD cases and 496 controls and from an independent set of 439 LOAD cases and 608 controls to strengthen power to identify novel genetic association signals. Associations exceeding the ex

View details →
Negative / Null Result ReportOpen accessMedicine

Subjective Cognitive Decline Correlates With Depression Symptoms and Not With Concurrent Objective Cognition in a Clinic-Based Sample of Older Adults

Zvinka Z. Zlatar, Martha C. Muniz, Douglas Galasko et al. · 2016 · The Journals of Gerontology Series B

Objectives: Subjective cognitive decline (SCD) is common in older adults; however, its utility in clinic-based samples remains controversial given its strong associations with mood symptoms. Methods: Five hundred nineteen individuals aged…

View details →
Negative / Null Result ReportOpen accessMedicine

Lipoprotein (a) concentrations, apolipoprotein (a) phenotypes, and peripheral arterial disease in three independent cohorts

Anja Laschkolnig, Barbara Kollerits, Claudia Lamina et al. · 2014 · Cardiovascular Research

AIMS: The relevance of lipoprotein(a) [Lp(a)] concentrations and low-molecular-weight (LMW) apo(a) phenotypes in peripheral arterial disease (PAD) has only been investigated by few studies. Therefore, we analysed this association in three…

View details →
Negative / Null Result ReportOpen accessMedicine

Survival rates and prognostic factors for infiltrating salivary duct carcinoma: Analysis of 228 cases from the Surveillance, Epidemiology, and End Results database

Vijayvel Jayaprakash, Mihai Merzianu, Graham Warren et al. · 2013 · Head & Neck

BACKGROUND: The survival rates and prognostic factors for salivary duct carcinoma (SDC) are not clear. METHODS: Survival estimates and prognostic factors were evaluated for 228 patients with SDC identified from the Surveillance,…

View details →
Negative / Null Result ReportOpen accessMedicine

Impact of CFTR Modulation on Intestinal pH, Motility, and Clinical Outcomes in Patients With Cystic Fibrosis and the G551D Mutation

Daniel Gelfond, Sonya L. Heltshe, Chang‐Xing Ma et al. · 2017 · Clinical and Translational Gastroenterology

OBJECTIVES: A defect in bicarbonate secretion contributes to the pathophysiology of gastrointestinal complications in patients with cystic fibrosis (CF). We measured gastrointestinal pH, clinical outcomes, and intestinal transit profiles…

View details →
Negative / Null Result ReportMedicine

Randomized Clinical Trial of Sodium Polystyrene Sulfonate for the Treatment of Mild Hyperkalemia in CKD

Laurence Lepage, A Dufour, Jessica Doiron et al. · 2015 · Clinical Journal of the American Society of Nephrology

BACKGROUND AND OBJECTIVES: Hyperkalemia affects up to 10% of patients with CKD. Sodium polystyrene sulfonate has long been prescribed for this condition, although evidence is lacking on its efficacy for the treatment of mild hyperkalemia…

View details →
Negative / Null Result ReportOpen accessMedicine

An experimental study on the effects of a simulation game on students’ clinical cognitive skills and motivation

Mary Dankbaar, Jelmer Alsma, Els E. H. Jansen et al. · 2015 · Advances in Health Sciences Education

Simulation games are becoming increasingly popular in education, but more insight in their critical design features is needed. This study investigated the effects of fidelity of open patient cases in adjunct to an instructional e-module on students' cognitive skills and motivation. We set up a three-group randomized post-test-only design: a control group working on an e-module; a cases group, combining the e-module with low-fidelity text-based patient cases, and a game group, combining the e-module with a high-fidelity simulation game with the same cases. Participants completed questionnaires

View details →
Negative / Null Result ReportOpen accessMedicine

Identification of subclasses of sepsis that showed different clinical outcomes and responses to amount of fluid resuscitation: a latent profile analysis

Zhongheng Zhang, Gensheng Zhang, Hemant Goyal et al. · 2018 · Critical Care

BACKGROUND AND OBJECTIVE: Sepsis is a heterogeneous disease and identification of its subclasses may facilitate and optimize clinical management. This study aimed to identify subclasses of sepsis and its responses to different amounts of fluid resuscitation. METHODS: This was a retrospective study conducted in an intensive care unit at a large tertiary care hospital. The patients fulfilling the diagnostic criteria of sepsis from June 1, 2001 to October 31, 2012 were included. Clinical and laboratory variables were used to perform the latent profile analysis (LPA). A multivariable logistic regr

View details →