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11,406 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

The antihypertensive MTHFR gene polymorphism rs17367504-G is a possible novel protective locus for preeclampsia

Liv Cecilie Vestrheim Thomsen, Nina S. McCarthy, Phillip E. Melton et al. · 2016 · Journal of Hypertension

OBJECTIVE: Preeclampsia is a complex heterogeneous disease commonly defined by new-onset hypertension and proteinuria in pregnancy. Women experiencing preeclampsia have increased risk for cardiovascular diseases (CVD) later in life.…

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Negative / Null Result ReportOpen accessMedicine

Does recreational scuba diving have clinically significant effect on routine haematological parameters?

Antonija Perović, Nora Nikolac, Marina Njire Bratičević et al. · 2017 · Biochemia Medica

INTRODUCTION: Scuba diving represents a combination of exercise and changes in environmental conditions. This study aimed to evaluate changes in haematological parameters after recreational scuba diving in order to identify clinically significant changes. MATERIALS AND METHODS: The study included males, 17 recreational divers, median age (range) 41 (30-52) years. Blood samples were taken before diving, immediately after diving to 30 meters for 30 minutes, 3 hours and 6 hours after diving. Complete blood counts were analyzed on the Cell Dyn Ruby haematology analyzer. Statistical significance be

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Negative / Null Result ReportOpen accessMedicine

First exposure to rituximab is associated to high rate of anti-drug antibodies in systemic lupus erythematosus but not in ANCA-associated vasculitis

Francesca Faustini, Nicky Dunn, Nastya Kharlamova et al. · 2021 · Arthritis Research & Therapy

BACKGROUND: Anti-drug antibodies (ADAs) can impact on the efficacy and safety of biologicals, today used to treat several chronic inflammatory conditions. Specific patient groups may be more prone to develop ADAs. Rituximab is routinely used for ANCA-associated vasculitis (AAV) and as off-label therapy for systemic lupus erythematosus (SLE), but data on occurrence and predisposing factors to ADAs in these diseases is limited. OBJECTIVES: To elucidate the rate of occurrence, and risk factors for ADAs against rituximab in SLE and AAV. METHODS: ADAs were detected using a bridging electrochemilumi

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Negative / Null Result ReportOpen accessMedicine

Measuring and tracking obesity inequality in the United States: evidence from NHANES, 1971-2014

Tae‐Young Pak, Susana Ferreira, Gregory Colson · 2016 · Population Health Metrics

BACKGROUND: Because people care about their weight relative to peers and society, obesity inequality plays a role in explaining obesity incidence and the impacts of being obese on subjective well-being. While the increase in obesity prevalence and mean body mass index (BMI) is well documented, the measurement of distributional changes and corresponding obesity inequality is yet to be fully explored. METHODS: The present study analyzed BMI data for adults aged 20 to 74 from the National Health and Nutritional Examination Survey (NHANES) I (1971-1974), II (1976-1980), III (1988-1994), and contin

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Negative / Null Result ReportOpen accessMedicine

Inflammation-Related Gene Variants as Risk Factors for Pancreatic Cancer

Kaye M. Reid–Lombardo, Brooke L. Fridley, William R. Bamlet et al. · 2011 · Cancer Epidemiology Biomarkers & Prevention

BACKGROUND: Recent reports support an association between chronic inflammation and progression to pancreatic cancer (PC). METHODS: This case-control, candidate gene association study evaluated 1,354 Caucasian patients with pancreatic…

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Negative / Null Result ReportOpen accessMedicine

Effect of Concurrent Chemoradiation With Celecoxib vs Concurrent Chemoradiation Alone on Survival Among Patients With Non–Small Cell Lung Cancer With and Without Cyclooxygenase 2 Genetic Variants

Nan Bi, Jun Liang, Zongmei Zhou et al. · 2019 · JAMA Network Open

Importance: Treatment of locally advanced non-small cell lung cancer (NSCLC) remains challenging. The rationale of combining a cyclooxygenase 2 (COX-2) inhibitor with concurrent chemoradiation (CCRT) was based on results of preclinical research and prospective clinical studies; however, no randomized clinical trial has provided evidence of a direct comparison with CCRT alone. Objective: To determine the effect of combined selective COX-2 inhibition with standard CCRT on survival among patients with unresectable stage III NSCLC. Design, Setting, and Participants: A single-center, open-label, ra

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Negative / Null Result ReportOpen accessMedicine

Longitudinal changes of white matter microstructure following traumatic brain injury in U.S. military service members

Ping‐Hong Yeh, Sara M. Lippa, Tracey A. Brickell et al. · 2022 · Brain Communications

Abstract The purpose of this study was to analyze quantitative diffusion tensor imaging measures across the spectrum of traumatic brain injury severity and evaluate their trajectories in military service members. Participants were 96 U.S. military service members and veterans who had sustained a mild traumatic brain injury [including complicated mild traumatic brain injury (n = 16) and uncomplicated mild traumatic brain injury (n = 68)], moderate-severe traumatic brain injury (n = 12), and controls (with or without orthopaedic injury, n = 39). All participants had been scanned at least twice,

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Negative / Null Result ReportOpen accessMedicine

TRAF1/C5but NotPTPRCVariants Are Potential Predictors of Rheumatoid Arthritis Response to Anti-Tumor Necrosis Factor Therapy

Helena Canhão, Ana Maria Rodrigues, María José Santos et al. · 2015 · BioMed Research International

BACKGROUND: The aim of our work was to replicate, in a Southern European population, the association reported in Northern populations between PTPRC locus and response to anti-tumor necrosis factor (anti-TNF) treatment in rheumatoid arthritis (RA). We also looked at associations between five RA risk alleles and treatment response. METHODS: We evaluated associations between anti-TNF treatment responses assessed by DAS28 change and by EULAR response at six months in 383 Portuguese patients. Univariate and multivariate linear and logistic regression analyses were performed. In a second step to con

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Negative / Null Result ReportOpen accessMedicine

Different Threshold of Malignancy for RAS-like Thyroid Tumors Causes Significant Differences in Thyroid Nodule Practice

Kennichi Kakudo · 2022 · Cancers

Histopathological diagnosis of papillary thyroid carcinomas (PTCs) is prone to significant observer variation due to different thresholds of RAS-like nuclear changes among pathologists. This gap recently widened due to a defensive attitude by Western pathologists where malpractice litigation is significant. Cases with delicate RAS-like nuclear changes are follicular adenomas when they are noninvasive, follicular carcinomas when invasive, and follicular variant PTCs when they have fully developed PTC-type nuclear features in Asian practice. The different diagnostic threshold of PTC nuclear feat

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Negative / Null Result ReportOpen accessMedicine

Results From the German Fungal Keratitis Registry: Significant Differences Between Cases With and Without a History of Contact Lens Use

Mathias Roth, Christoph Holtmann, Loay Daas et al. · 2021 · Cornea

PURPOSE: Fungal keratitis (FK) is a serious ophthalmic disease with a potentially devastating outcome that seems to be increasing in recent years. The use of contact lenses (CLs) was evaluated as a risk factor for FK to determine possible…

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Negative / Null Result ReportOpen accessMedicine

Significant association between polymorphism of the erythropoietin gene promoter and myelodysplastic syndrome

Wanlong Ma, Hagop M. Kantarjian, Ke Zhang et al. · 2010 · BMC Medical Genetics

BACKGROUND: Myelodysplastic syndrome (MDS) may be induced by certain mutagenic environmental or chemotherapeutic toxins; however, the role of susceptibility genes remains unclear. The G/G genotype of the single-nucleotide polymorphism (SNP) rs1617640 in the erythropoietin (EPO) promoter has been shown to be associated with decreased EPO expression. We examined the association of rs1617640 genotype with MDS. METHODS: We genotyped the EPO rS1617640 SNP in 189 patients with MDS, 257 with acute myeloid leukemia (AML), 106 with acute lymphoblastic leukemia, 97 with chronic lymphocytic leukemia, 353

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Negative / Null Result ReportOpen accessMedicine

Evaluation of GWAS candidate susceptibility loci for uterine leiomyoma in the multi-ethnic NIEHS uterine fibroid study

Brahim Aı̈ssani, Kui Zhang, Howard W. Wiener · 2015 · Frontiers in Genetics

We evaluated the association of 56 candidate SNPs identified in two published genome-wide association studies (GWAS) of uterine leiomyoma (UL), or fibroids, with the risk and tumor size in the multi-ethnic uterine fibroid study (NIEHS-UFS). The selected SNPs were genotyped in 916 premenopausal women of African American (AA) and European American (EA) descents and their association with the outcomes was evaluated in race-stratified models and in meta-analysis of risk in NIEHS-UFS and discovery and replication GWAS in the Japanese population. We report moderate associations of variant rs4954368

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Negative / Null Result ReportOpen accessMedicine

Life's Essential 8 and carotid artery plaques: the Swedish cardiopulmonary bioimage study

Ángel Herráiz-Adillo, Viktor H. Ahlqvist, Sara Higueras‐Fresnillo et al. · 2023 · Frontiers in Cardiovascular Medicine

Background To quantify cardiovascular health (CVH), the American Heart Association (AHA) recently launched an updated construct of the “Life's Simple 7” (LS7) score, the “Life's Essential 8” (LE8) score. This study aims to analyse the association between both CVH scores and carotid artery plaques and to compare the predictive capacity of such scores for carotid plaques. Methods Randomly recruited participants aged 50–64 years from the Swedish CArdioPulmonary bioImage Study (SCAPIS) were analysed. According to the AHA definitions, two CVH scores were calculated: i) the LE8 score (0, worst CVH;

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Negative / Null Result ReportOpen accessMedicine

BRCA2 Germline Mutations Identify Gastric Cancers Responsive to PARP Inhibitors

Annalisa Petrelli, Sabrina Rizzolio, Filippo Pietrantonio et al. · 2023 · Cancer Research

Despite negative results of clinical trials conducted on the overall population of patients with gastric cancer, PARP inhibitor (PARPi) therapeutic strategy still might represent a window of opportunity for a subpopulation of patients with…

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Negative / Null Result ReportOpen accessMedicine

Joint polygenic and environmental risks for childhood attention‐deficit/hyperactivity disorder (ADHD) and ADHD symptom dimensions

Michael A. Mooney, Peter Ryabinin, Hannah E. Morton et al. · 2023 · JCPP Advances

Abstract Background attention‐deficit/hyperactivity disorder (ADHD) is associated with both polygenic liability and environmental exposures, both intrinsic to the family, such as family conflict, and extrinsic, such as air pollution. However, much less is known about the interplay between environmental and genetic risks relevant to ADHD—a better understanding of which could inform both mechanistic models and clinical prediction algorithms. Methods Two independent data sets, the population‐based Adolescent Brain Cognitive Development Study (ABCD) ( N = 11,876) and the case‐control Oregon‐ADHD‐1

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Negative / Null Result ReportMedicine

Genetic basis of polycystic ovary syndrome

TM Barber, Stephen Franks · 2010 · Expert Review of Endocrinology & Metabolism

Polycystic ovary syndrome (PCOS) is associated with obesity and manifests with reproductive, hyperandrogenic and metabolic features. Although the etiology of PCOS is complex and incompletely understood, genetics plays an important role…

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Negative / Null Result ReportOpen accessMedicine

Overlooked Candida glabrata petites are echinocandin tolerant, induce host inflammatory responses, and display poor in vivo fitness

Amir Arastehfar, Farnaz Daneshnia, Hrant Hovhannisyan et al. · 2023 · mBio

ABSTRACT Small colony variants are relatively common among some bacterial species and are associated with poor prognosis and recalcitrant infections. Similarly, Candida glabrata— a major intracellular fungal pathogen—produces small and slow-growing respiratory-deficient colonies, termed “petite.” Despite reports of clinical petite C. glabrata strains, our understanding of petite behavior in the host remains obscure. Moreover, controversies exist regarding in-host petite fitness and its clinical relevance. Herein, we employed whole-genome sequencing (WGS), dual-RNAseq, and extensive ex vivo and

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Negative / Null Result ReportOpen accessMedicine

Interferon-based agents for current and future viral respiratory infections: A scoping literature review of human studies

Aldina Mešić, Emahlea Jackson, Mathias Lalika et al. · 2022 · PLOS Global Public Health

The interferon (IFN) system is a potent line of defense against viral infections. IFN-based agents already tested may be of use in COVID-19 or future viral respiratory outbreaks. Here we review the comparative efficacy, safety/tolerability, and future potential of IFN-based therapeutics. We reviewed human studies in which IFN or IFN pathway-interacting agents were used for viral respiratory infections. We identified 977 articles, of which 194 were included for full-text review. Of these, we deemed 35 articles to be relevant. The use of IFN-based agents for pre-exposure prophylaxis (n = 19) and

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Negative / Null Result ReportOpen accessMedicine

Novel Protease Inhibitors (PIs) Containing Macrocyclic Components and 3( R ),3a( S ),6a( R )- bis -Tetrahydrofuranylurethane That Are Potent against Multi-PI-Resistant HIV-1 Variants In Vitro

Yasushi Tojo, Yasuhiro Koh, Masayuki Amano et al. · 2010 · Antimicrobial Agents and Chemotherapy

Natural products with macrocyclic structural features often display intriguing biological properties. Molecular design incorporating macrocycles may lead to molecules with unique protein-ligand interactions. We generated novel human…

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Negative / Null Result ReportOpen accessMedicine

Significant differences between serum CRP levels in children in different categories of physical activity: the PLAY study.

Berna Harmse, Herculina S. Kruger · 2011 · PubMed

Low-grade systemic inflammation is emerging as a component of the metabolic syndrome. The purpose of this study was to assess the association between serum C-reactive protein (CRP), physical activity and body composition in 193 black children aged 13 to 18 years from a South African township. Demographic information and anthropometric measurements were taken, and fasting blood samples were analysed for high-sensitivity serum CRP. Body fat was measured by air displacement plethysmography. There was a trend towards higher serum CRP in the boys with a higher percentage body fat. After multiple re

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Negative / Null Result ReportOpen accessMedicine

Predictors for Survival in an International Cohort of Patients Undergoing Distal Pancreatectomy for Pancreatic Ductal Adenocarcinoma

Maarten Korrel, Sanne Lof, Jony van Hilst et al. · 2020 · Annals of Surgical Oncology

BACKGROUND: Surgical factors, including resection of Gerota's fascia, R0-resection, and lymph node yield, may be associated with survival after distal pancreatectomy (DP) for pancreatic ductal adenocarcinoma (PDAC), but evidence from large multicenter studies is lacking. This study aimed to identify predictors for overall survival after DP for PDAC, especially those related to surgical technique. PATIENTS AND METHODS: Data from an international retrospective cohort including patients from 11 European countries and the USA who underwent DP for PDAC (2007-2015) were analyzed. Cox proportional ha

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Negative / Null Result ReportMedicine

Administrative Databases Used for Sports Medicine Research Demonstrate Significant Differences in Underlying Patient Demographics and Resulting Surgical Trends

Michelle Xiao, Joseph Donahue, Marc R. Safran et al. · 2020 · Arthroscopy The Journal of Arthroscopic and Related Surgery

Purpose To discern differences between the PearlDiver and MarketScan databases with regards to patient demographics, costs, reoperations, and complication rates for isolated meniscectomy. Methods We queried the PearlDiver Humana Patient…

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Negative / Null Result ReportOpen accessMedicine

Evaluating the Safety of Maribavir for the Treatment of Cytomegalovirus

Ronak G Gandhi, Camille N Kotton · 2022 · Therapeutics and Clinical Risk Management

Purpose of Review: Cytomegalovirus (CMV) infections are a common complication in solid organ (SOT) and hematopoietic stem cell transplant (HSCT) recipients, leading to increased morbidity and mortality. Currently available treatment…

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Negative / Null Result ReportOpen accessMedicine

The reliability characteristics of the REFLECT rubric for assessing reflective capacity through expressive writing assignments: A replication study

Lawrence Grierson, Samantha Winemaker, Alan Taniguchi et al. · 2020 · Perspectives on Medical Education

INTRODUCTION: The medical education community has implemented writing exercises that foster critical analysis and nurture reflective capacity. The REFLECT rubric (Wald et al. 2012) was developed to address the challenge of assessing these written reflections. The objective of this replication work is to explore the reproducibility of the reliability characteristics presented by the REFLECT developers. METHODS: Five raters evaluated narratives written by medical students and experienced clinicians using the REFLECT rubric. Reliability across rubric domains was determined via intraclass correlat

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