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Subhani M, Enki DG, Knight H, Jones KA, Sprange K, Rennick-Egglestone S, Morling JR, Wragg A, Hutton C, Ryder SD. Does knowledge of liver fibrosis affect high-risk drinking behaviour (KLIFAD): an open-label pragmatic feasibility randomised controlled trial. EClinicalMedicine 2023; 61:102069. [PMID: 37448808 PMCID: PMC10336239 DOI: 10.1016/j.eclinm.2023.102069] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2023] [Revised: 06/13/2023] [Accepted: 06/13/2023] [Indexed: 07/15/2023] Open
Abstract
Background Early identification followed by effective behaviour interventions is pivotal to changing the natural history of alcohol-related liver disease. We examined the feasibility of using transient elastography based advice and alcohol recovery video stories (ARVS) to change drinking behaviour in community alcohol services. Methods A feasibility randomised control trial (RCT) was conducted in three community alcohol services. Adults 18+ years presenting with a primary alcohol problem were randomised (1:1) to receive either usual care (control group) or usual care and the KLIFAD Intervention, consisting of advice tailored to liver stiffness measure and access to ARVS (intervention group). Data were collected at baseline and six months. To establish definitive trial feasibility, recruitment and retention rates, study procedure safety and extent of effectiveness were measured (Start date: 02.10.2019, End date: 30.11.2022, ISRCTN.com: 16922410). Findings 382 service users were screened, 184 were randomised (intervention: 93, control: 91), and baseline data were collected for 128 (intervention: 71, control: 59). Six months follow-up data were available in 87 (intervention: 53, control: 34). Intervention compared to the control group had a longer duration of engagement with services (mean difference 8.6 days SD = 18.4), was more likely to complete the allocated treatment program and reduced or stop drinking (54.9% vs 43.9%) and reduce AUDIT category (71.7% vs 61.8%). There were no reported serious adverse reactions, one intervention group participant reported an increase in AUDIT category. Interpretation Integration of transient elastography in community alcohol services is feasible. It may improve engagement with services, retention in clinical trials and supplement the reduction in self-reported alcohol consumption. A definitive RCT is supported. Funding National Institute for Health and Care Research (NIHR201146).
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Affiliation(s)
- Mohsan Subhani
- Nottingham Digestive Diseases Centre (NDDC), School of Medicine, University of Nottingham, Nottingham, UK
- NIHR Nottingham Biomedical Research Centre, Nottingham University Hospitals NHS Trust and the University of Nottingham, Nottingham, UK
| | - Doyo G. Enki
- School of Medicine, University of Nottingham, Nottingham, UK
| | - Holly Knight
- Nottingham Centre for Public Health and Epidemiology, University of Nottingham, Nottingham, UK
| | - Katy A. Jones
- Academic Unit of Mental Health and Clinical Neuroscience, School of Medicine, Institute of Mental Health, University of Nottingham, Nottingham, UK
| | - Kirsty Sprange
- Nottingham Clinical Trials Unit, University of Nottingham, Nottingham, UK
| | | | - Joanne R. Morling
- Nottingham Digestive Diseases Centre (NDDC), School of Medicine, University of Nottingham, Nottingham, UK
- NIHR Nottingham Biomedical Research Centre, Nottingham University Hospitals NHS Trust and the University of Nottingham, Nottingham, UK
- Nottingham Centre for Public Health and Epidemiology, University of Nottingham, Nottingham, UK
| | - Andrew Wragg
- NIHR Nottingham Biomedical Research Centre, Nottingham University Hospitals NHS Trust and the University of Nottingham, Nottingham, UK
| | - Clare Hutton
- Patient and Public Involvement (PPI) Co-applicant, Nottingham, UK
| | - Stephen D. Ryder
- Nottingham Digestive Diseases Centre (NDDC), School of Medicine, University of Nottingham, Nottingham, UK
- NIHR Nottingham Biomedical Research Centre, Nottingham University Hospitals NHS Trust and the University of Nottingham, Nottingham, UK
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Subhani M, Jones KA, Sprange K, Rennick-Egglestone S, Knight H, Morling JR, Enki DG, Wragg A, Ryder SD. Does knowledge of liver fibrosis affect high-risk drinking behaviour (KLIFAD)? protocol for a feasibility randomised controlled trial. BMJ Open 2021; 11:e054954. [PMID: 34732502 PMCID: PMC8572412 DOI: 10.1136/bmjopen-2021-054954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
INTRODUCTION Heavy drinkers in contact with alcohol services do not routinely have access to testing to establish the severity of potential liver disease. Transient elastography by FibroScan can provide this information. A recent systematic review suggested providing feedback to patients based on markers of liver injury can be an effective way to reduce harmful alcohol intake. This randomised control trial (RCT) aims to establish the feasibility of conducting a larger national trial to test the effectiveness of FibroScan advice and Alcohol Recovery Video Stories (ARVS) in changing high-risk drinking behaviour in community alcohol services common to UK practice. METHODS AND ANALYSIS This feasibility trial consists of three work packages (WP). WP1: To draft a standardised script for FibroScan operators to deliver liver disease-specific advice to eligible participants having FibroScan. WP2: To create a video library of ARVS for use in the feasibility RCT (WP3). WP3: To test the feasibility of the trial design, including the FibroScan script and video stories developed in WP1 and WP2 in a one-to-one individual randomised trial in community alcohol services. Semi-structured interviews will be conducted at 6 months follow-up for qualitative evaluation. Outcomes will be measures of the feasibility of conducting a larger RCT. These outcomes will relate to: participant recruitment and follow-up, intervention delivery, including the use of the Knowledge of LIver Fibrosis Affects Drinking trial FibroScan scripts and videos, clinical outcomes, and the acceptability and experience of the intervention and trial-related procedures. Data analysis will primarily be descriptive to address the feasibility aims of the trial. All proposed analyses will be documented in a Statistical Analysis Plan. ETHICS AND DISSEMINATION This trial received favourable ethical approval from the West of Scotland Research Ethics Service (WoSRES) on 20 January 2021, REC reference: 20/WS/0179. Results will be submitted for publication to a peer-reviewed journal. TRIAL REGISTRATION NUMBER ISRCTN16922410.
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Affiliation(s)
- Mohsan Subhani
- Nottingham Digestive Diseases Biomedical Research Centre (NDDC), School of Medicine, University of Nottingham, Nottingham, UK
- NIHR Nottingham Biomedical Research Centre, Nottingham University Hospitals NHS Trust and the University of Nottingham, Nottingham, UK
| | - Katy A Jones
- Academic Unit of Mental Health and Clinical Neuroscience, School of Medicine, C24 Institute of Mental Health, University of Nottingham, Nottingham, UK
| | - Kirsty Sprange
- Nottingham Clinical Trials Research Unit, University of Nottingham, Nottingham, UK
| | | | - Holly Knight
- Division of Epidemiology and Public Health, University of Nottingham, Nottingham, UK
| | - Joanne R Morling
- Nottingham Digestive Diseases Biomedical Research Centre (NDDC), School of Medicine, University of Nottingham, Nottingham, UK
- NIHR Nottingham Biomedical Research Centre, Nottingham University Hospitals NHS Trust and the University of Nottingham, Nottingham, UK
- Division of Epidemiology and Public Health, University of Nottingham, Nottingham, UK
| | - Doyo G Enki
- School of Medicine, University of Nottingham, Nottingham, UK
| | - Andrew Wragg
- NIHR Nottingham Biomedical Research Centre, Nottingham University Hospitals NHS Trust and the University of Nottingham, Nottingham, UK
| | - Stephen D Ryder
- Nottingham Digestive Diseases Biomedical Research Centre (NDDC), School of Medicine, University of Nottingham, Nottingham, UK
- NIHR Nottingham Biomedical Research Centre, Nottingham University Hospitals NHS Trust and the University of Nottingham, Nottingham, UK
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Erwin J, Enki DG, Woolf AD. Younger people with rheumatoid arthritis are at increased risk of fracture even before age 50 years: a population-based cohort study. Osteoporos Int 2021; 32:1651-1659. [PMID: 33569694 DOI: 10.1007/s00198-021-05862-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Accepted: 01/27/2021] [Indexed: 11/30/2022]
Abstract
UNLABELLED Less is known about the risk of fracture in people with rheumatoid arthritis aged under 50 than those in older age groups. The study shows that the risk of fracture before age 50 remains significantly higher in those with rheumatoid arthritis than matched controls. This has implications for fracture risk management. INTRODUCTION To determine the risk of first and subsequent fracture occurring before age 50 in people diagnosed with rheumatoid arthritis (RA) before age 50. METHODS A retrospective observational cohort study of RA cases with matched controls using data from Clinical Practice Research Datalink (CPRD) of adults ≥ 18 years with diagnosis of RA recorded from 1992 to 2016 in the UK. Patients were followed from index date to the first fracture and subsequent fracture. A total of 36,858 cases were each matched to 3 controls. Incidence rates (IR) and incidence rate ratios (IRR) of first and subsequent fractures were calculated. A multivariate Cox's proportional hazards model was used to calculate the risk of first fracture and of subsequent fracture in the presence of different risk factors. RESULTS The IR of first and subsequent fractures at any age is significantly higher in cases than controls for patients with onset of RA at any age. This includes first fractures occurring before age 50 for those diagnosed with RA before this age. In women, the rate of first fracture before age 50 are significantly higher than matched controls (IRR 1.29 CI 1.12-1.49), the IRR for subsequent fracture is higher but not significantly so. For men, the IRRs of first and subsequent fractures below age 50 are also higher but not significantly so. Gender, previous fracture, glucocorticoid prescription, osteoporosis diagnosis, alcohol, smoking, and bisphosphonate prescription have a significant effect on the risk of first fracture at any age for RA patients; all these variables except osteoporosis diagnosis and alcohol have a significant effect on the risk of subsequent fracture and first fractures before age 50. CONCLUSIONS These results indicate an increased risk of first fracture before age 50 in people with RA diagnosed before this age. It is important that patients with RA of all ages are given timely support from the time of diagnosis to protect their bone health.
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Affiliation(s)
- J Erwin
- Research Development & Innovations, Royal Cornwall Hospitals NHS Trust, Truro, UK.
| | - D G Enki
- School of Medicine, University of Nottingham, Nottingham, UK
| | - A D Woolf
- Research Development & Innovations, Royal Cornwall Hospitals NHS Trust, Truro, UK
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Bennett K, Enki DG, Thursz M, Cramp ME, Dhanda AD. Systematic review with meta-analysis: high mortality in patients with non-severe alcoholic hepatitis. Aliment Pharmacol Ther 2019; 50:249-257. [PMID: 31231848 DOI: 10.1111/apt.15376] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 04/07/2019] [Accepted: 05/26/2019] [Indexed: 12/11/2022]
Abstract
BACKGROUND Alcoholic hepatitis is a serious complication of alcohol misuse. Severe alcoholic hepatitis with its high mortality, has been investigated in detail but 'nonsevere alcoholic hepatitis' is poorly characterised. Survival of this group of patients is unknown. AIM To conduct a systematic review and meta-analysis to determine 28-day, 90-day and 1-year mortality of patients with nonsevere alcoholic hepatitis. METHODS The protocol was registered on the PROSPERO database (CRD42018107451). Embase, Medline and Cochrane Central databases were searched until July 2018. All study designs reporting mortality rates in patients with nonsevere alcoholic hepatitis were eligible. Mortality data were extracted and meta-analysis performed using a random effects model. Risk of bias was assessed by Cochrane risk of bias or National Institutes of Health quality assessment tool for case series studies. RESULTS Twenty-five studies (n = 1372 patients; 12 prospective) met criteria. Nonsevere was variably defined based on bilirubin, prothrombin time, and creatinine. Twenty-eight day mortality (17 studies; n = 993) was 6% (95% CI 3%-9%; I2 = 67.3%; P < 0.001), 90-day mortality (15 studies; n = 755) was 7% (4%-11%, I2 = 64.2%; P < 0.001) and 1-year mortality (five studies; n = 234) was 13% (4%-24%; I2 = 72%; P = 0.006). Subgroup analyses by method of diagnosis (histological vs clinical) or study design (prospective vs retrospective) did not reveal differences in mortality. CONCLUSION Nonsevere alcoholic hepatitis is not benign with 6% and 13% 28-day and 1-year mortality, respectively. This systematic review demonstrates the paucity of high quality studies in patients with nonsevere alcoholic hepatitis. Our analysis suggests that patients who do not meet criteria for severe alcoholic hepatitis are an important and hitherto overlooked clinical group. Full characterisation of clinical outcome and development of treatment strategies to reduce mortality in this group is a priority.
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Affiliation(s)
- Kris Bennett
- Institute of Translational and Stratified Medicine, University of Plymouth, UK
- South West Liver Unit, University Hospitals Plymouth NHS Trust, Plymouth, UK
| | - Doyo G Enki
- Medical Statistics Group, University of Plymouth, UK
| | - Mark Thursz
- Department of Surgery and Cancer, Imperial College London, London, UK
| | - Matthew E Cramp
- Institute of Translational and Stratified Medicine, University of Plymouth, UK
- South West Liver Unit, University Hospitals Plymouth NHS Trust, Plymouth, UK
| | - Ashwin D Dhanda
- Institute of Translational and Stratified Medicine, University of Plymouth, UK
- South West Liver Unit, University Hospitals Plymouth NHS Trust, Plymouth, UK
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Rickard AC, Vassallo J, Nutbeam T, Lyttle MD, Maconochie IK, Enki DG, Smith JE. Paediatric traumatic cardiac arrest: a Delphi study to establish consensus on definition and management. Emerg Med J 2018; 35:434-439. [PMID: 29705730 DOI: 10.1136/emermed-2017-207226] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Revised: 03/07/2018] [Accepted: 04/17/2018] [Indexed: 11/04/2022]
Abstract
AIMS Paediatric traumatic cardiac arrest (TCA) is associated with low survival and poor outcomes. The mechanisms that underlie TCA are different from medical cardiac arrest; the approach to treatment of TCA may therefore also need to differ to optimise outcomes. The aim of this study was to explore the opinion of subject matter experts regarding the diagnosis and treatment of paediatric TCA, and to reach consensus on how best to manage this group of patients. METHODS An online Delphi study was conducted over three rounds, with the aim of achieving consensus (defined as 70% agreement) on statements related to the diagnosis and management of paediatric TCA. Participants were invited from paediatric and adult emergency medicine, paediatric anaesthetics, paediatric ICU and paediatric surgery, as well as Paediatric Major Trauma Centre leads and representatives from the Resuscitation Council UK. Statements were informed by literature reviews and were based on elements of APLS resuscitation algorithms as well as some concepts used in the management of adult TCA; they ranged from confirmation of cardiac arrest to the indications for thoracotomy. RESULTS 73 experts completed all three rounds between June and November 2016. Consensus was reached on 14 statements regarding the diagnosis and management of paediatric TCA; oxygenation and ventilatory support, along with rapid volume replacement with warmed blood, improve survival. The duration of cardiac arrest and the lack of a response to intervention, along with cardiac standstill on ultrasound, help to guide the decision to terminate resuscitation. CONCLUSION This study has given a consensus-based framework to guide protocol development in the management of paediatric TCA, though further work is required in other key areas including its acceptability to clinicians.
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Affiliation(s)
- Annette C Rickard
- Emergency Department, University Hospitals Plymouth NHS Trust, Plymouth, UK
| | - James Vassallo
- Emergency Department, University Hospitals Plymouth NHS Trust, Plymouth, UK.,Academic Department of Military Emergency Medicine, Royal Centre for Defence Medicine (Research and Academia), Birmingham, UK
| | - Tim Nutbeam
- Emergency Department, University Hospitals Plymouth NHS Trust, Plymouth, UK
| | - Mark D Lyttle
- Emergency Department, Bristol Royal Hospital for Children, Bristol, UK.,Faculty of Health and Applied Sciences, University of the West of England, Bristol, UK
| | - Ian K Maconochie
- Emergency Department, Imperial College NHS Healthcare Trust, London, UK
| | - Doyo G Enki
- Medical Statistics Group, Plymouth University Peninsula Schools of Medicine and Dentistry, Plymouth, UK
| | - Jason E Smith
- Emergency Department, University Hospitals Plymouth NHS Trust, Plymouth, UK.,Academic Department of Military Emergency Medicine, Royal Centre for Defence Medicine (Research and Academia), Birmingham, UK
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6
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Jones R, Kirenga BJ, Katagira W, Singh SJ, Pooler J, Okwera A, Kasiita R, Enki DG, Creanor S, Barton A. A pre-post intervention study of pulmonary rehabilitation for adults with post-tuberculosis lung disease in Uganda. Int J Chron Obstruct Pulmon Dis 2017; 12:3533-3539. [PMID: 29270007 PMCID: PMC5729823 DOI: 10.2147/copd.s146659] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Setting The study was conducted at Mulago Hospital, Kampala, Uganda. Objective As chronic respiratory disease (CRD) is a huge, growing burden in Africa, with few available treatments, we aimed to design and evaluate a culturally appropriate pulmonary rehabilitation (PR) program in Uganda for people with post-tuberculosis lung disorder (p-TBLD). Design In a pre–post intervention study, a 6-week, twice-weekly PR program was designed for people with p-TBLD. Outcome measures included recruitment, retention, the Clinical COPD Questionnaire (CCQ), tests of exercise capacity, and biometrics. Given this was a developmental study, no formal statistical significance testing was undertaken. Results In all, 34 participants started PR and 29 (85%) completed all data collection. The mean age of the 29 participants was 45 years, and 52% were female. The mean (95% confidence interval) CCQ score at baseline was 1.8 (1.5, 2.0), at the end of PR was 1.0 (0.8, 1.2), and at 6 weeks after the end of PR was 0.8 (0.7, 1.0). The Incremental Shuttle Walking Test (ISWT) was 299 m (268.5, 329.4) at baseline, 377 (339.6, 413.8) at the end of PR, and 374 (334.2, 413.5) at 6 weeks after the end of PR. Improvements were seen in measures of chest pain; 13/29 (45%) participants reported chest pain at baseline but only 7/29 (24%) at the end of PR, and in those with persistent pain, the mean pain scores decreased. Mild hemoptysis was reported in 4/29 (17%) participants at baseline and in 2/29 (7%) at the end of PR. Conclusion PR for people with p-TBLD in Uganda was feasible and associated with clinically important improvements in quality of life, exercise capacity, and respiratory outcomes. PR uses local resources, requires little investment, and offers a new, sustainable therapy for p-TBLD in resource-limited settings. With the rising global burden of CRD, further studies are needed to assess the value of PR in p-TBLD and other prevalent forms of CRD.
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Affiliation(s)
- Rupert Jones
- Population Studies and Clinical Trials, Peninsula Schools of Medicine and Dentistry, Plymouth University, Plymouth, UK
| | - Bruce J Kirenga
- Population Studies and Clinical Trials, Makerere Lung Institute, Makerere University College of Health Sciences, Mulago Hospital, Kampala, Uganda
| | - Wincelsas Katagira
- Population Studies and Clinical Trials, Makerere Lung Institute, Makerere University College of Health Sciences, Mulago Hospital, Kampala, Uganda
| | - Sally J Singh
- Cardio-Respiratory Directorate, University Hospitals of Leicester NHS Trust, Leicester
| | - Jill Pooler
- Population Studies and Clinical Trials, Peninsula Schools of Medicine and Dentistry, Plymouth University, Plymouth, UK
| | - Alphonse Okwera
- Population Studies and Clinical Trials, Makerere Lung Institute, Makerere University College of Health Sciences, Mulago Hospital, Kampala, Uganda
| | - Richard Kasiita
- Department of Physiotherapy, Mulago Hospital, Kampala, Uganda
| | - Doyo G Enki
- Medical Statistics, Peninsula Schools of Medicine and Dentistry, Plymouth University, Plymouth, UK
| | - Siobhan Creanor
- Medical Statistics, Peninsula Schools of Medicine and Dentistry, Plymouth University, Plymouth, UK
| | - Andy Barton
- Population Studies and Clinical Trials, Peninsula Schools of Medicine and Dentistry, Plymouth University, Plymouth, UK
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Williams EL, Stimpson ML, Collins PL, Enki DG, Sinha A, Lee RW, Dhanda AD. Development and validation of a novel bioassay to determine glucocorticoid sensitivity. Biomark Res 2016; 4:26. [PMID: 27999674 PMCID: PMC5157083 DOI: 10.1186/s40364-016-0079-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Accepted: 12/02/2016] [Indexed: 12/20/2022] Open
Abstract
Background Glucocorticoids (GCs) remain the first line treatment for almost all non-infectious inflammatory diseases, ranging from acute asthma to rheumatoid arthritis. However, across all conditions, patients have a variable response to GCs with approximately 30% being non-responders. This group of GC resistant patients is typically exposed to high-dose GCs and their side-effects before more appropriate immunotherapy is instituted. Hence, there is a pressing clinical need for a predictive biomarker of GC responsiveness. The availability of such a tool would also enable patient stratification for the conduct of smart clinical trials in GC resistance. Lymphocyte GC sensitivity has been shown to be closely associated with clinical GC sensitivity in a number of inflammatory diseases. However, the method for determining in vitro GC response is not standardized and requires the use of specialist equipment, including a radioisotope to quantify cellular proliferation, making it challenging to translate into clinical practice. Results Here we describe the optimization and validation of a novel non-radioactive in vitro bioassay based on measuring cellular proliferation by incorporation of bromodeoxyuridine (BrdU), termed the BrdU incorporation in lymphocyte steroid sensitivity assay (BLISS). In comparison to the current gold standard lymphocyte GC sensitivity assay in 101 healthy control samples, BLISS has an area under receiver operating characteristic of 0.82 and a sensitivity of 83% for correctly identifying GC resistant subjects. Conclusions The performance of the novel BLISS bioassay makes it a strong candidate biomarker for clinical application. It now requires validation in a prospective patient cohort. Electronic supplementary material The online version of this article (doi:10.1186/s40364-016-0079-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Emily L Williams
- School of Clinical Sciences, Medical Sciences Building, University of Bristol, Bristol, BS9 1TD UK.,National Institute for Health Research Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, University Hospitals Bristol NHS Foundation Trust and University of Bristol, Bristol, UK
| | - Madeleine L Stimpson
- School of Clinical Sciences, Medical Sciences Building, University of Bristol, Bristol, BS9 1TD UK.,National Institute for Health Research Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, University Hospitals Bristol NHS Foundation Trust and University of Bristol, Bristol, UK
| | - Peter L Collins
- School of Clinical Sciences, Medical Sciences Building, University of Bristol, Bristol, BS9 1TD UK.,Department of Liver Medicine, University Hospitals Bristol NHS Foundation Trust, Bristol, BS2 8HW UK
| | - Doyo G Enki
- Biostatistics, Bioinformatics and Biomarkers research group, Plymouth University, N15 Plymouth Science Park, Plymouth, PL6 8BX UK
| | - Ashish Sinha
- Department of Liver Medicine, University Hospitals Bristol NHS Foundation Trust, Bristol, BS2 8HW UK
| | - Richard W Lee
- School of Clinical Sciences, Medical Sciences Building, University of Bristol, Bristol, BS9 1TD UK.,National Institute for Health Research Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, University Hospitals Bristol NHS Foundation Trust and University of Bristol, Bristol, UK
| | - Ashwin D Dhanda
- School of Clinical Sciences, Medical Sciences Building, University of Bristol, Bristol, BS9 1TD UK.,Institute of Translational and Stratified Medicine, Plymouth University Peninsula Schools of Medicine and Dentistry, John Bull Building, Plymouth, PL6 8BU UK.,South West Liver Unit, Plymouth Hospitals NHS Trust, Plymouth, UK
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Enki DG, Garthwaite PH, Farrington CP, Noufaily A, Andrews NJ, Charlett A. Comparison of Statistical Algorithms for the Detection of Infectious Disease Outbreaks in Large Multiple Surveillance Systems. PLoS One 2016; 11:e0160759. [PMID: 27513749 PMCID: PMC4981474 DOI: 10.1371/journal.pone.0160759] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Accepted: 07/25/2016] [Indexed: 11/18/2022] Open
Abstract
A large-scale multiple surveillance system for infectious disease outbreaks has been in operation in England and Wales since the early 1990s. Changes to the statistical algorithm at the heart of the system were proposed and the purpose of this paper is to compare two new algorithms with the original algorithm. Test data to evaluate performance are created from weekly counts of the number of cases of each of more than 2000 diseases over a twenty-year period. The time series of each disease is separated into one series giving the baseline (background) disease incidence and a second series giving disease outbreaks. One series is shifted forward by twelve months and the two are then recombined, giving a realistic series in which it is known where outbreaks have been added. The metrics used to evaluate performance include a scoring rule that appropriately balances sensitivity against specificity and is sensitive to variation in probabilities near 1. In the context of disease surveillance, a scoring rule can be adapted to reflect the size of outbreaks and this was done. Results indicate that the two new algorithms are comparable to each other and better than the algorithm they were designed to replace.
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Affiliation(s)
- Doyo G. Enki
- Medical Statistics Group, Plymouth University Peninsula Schools of Medicine and Dentistry, Plymouth, United Kingdom
- * E-mail:
| | - Paul H. Garthwaite
- Department of Mathematics and Statistics, The Open University, Milton Keynes, United Kingdom
| | - C. Paddy Farrington
- Department of Mathematics and Statistics, The Open University, Milton Keynes, United Kingdom
| | - Angela Noufaily
- Warwick Medical School, Warwick University, Coventry, United Kingdom
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Hilton DA, Shivane A, Kirk L, Bassiri K, Enki DG, Hanemann CO. Activation of multiple growth factor signalling pathways is frequent in meningiomas. Neuropathology 2015; 36:250-61. [DOI: 10.1111/neup.12266] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Revised: 09/25/2015] [Accepted: 09/26/2015] [Indexed: 01/14/2023]
Affiliation(s)
- David A Hilton
- Department of Cellular and Anatomical Pathology; Derriford Hospital; Plymouth UK
| | - Aditya Shivane
- Department of Cellular and Anatomical Pathology; Derriford Hospital; Plymouth UK
| | - Leanne Kirk
- Department of Cellular and Anatomical Pathology; Derriford Hospital; Plymouth UK
| | - Kayleigh Bassiri
- Institute of Translational and Stratified Medicine; Plymouth University Peninsula Schools of Medicine & Dentistry; Plymouth UK
| | - Doyo G Enki
- Plymouth University Peninsula Schools of Medicine & Dentistry; Plymouth UK
| | - C Oliver Hanemann
- Institute of Translational and Stratified Medicine; Plymouth University Peninsula Schools of Medicine & Dentistry; Plymouth UK
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Enki DG, Noufaily A, Farrington CP, Garthwaite PH, Andrews N, Charlett A, Lane C. Statistical Models for Biosurveillance of Multiple Organisms. Online J Public Health Inform 2013. [PMCID: PMC3692751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Objective To look at the diversity of the patterns displayed by a range of organisms, and to seek a simple family of models that adequately describes all organisms, rather than a well-fitting model for any particular organism. Introduction There has been much research on statistical methods of prospective outbreak detection that are aimed at identifying unusual clusters of one syndrome or disease, and some work on multivariate surveillance methods (1). In England and Wales, automated laboratory surveillance of infectious diseases has been undertaken since the early 1990’s. The statistical methodology of this automated system is described in (2). However, there has been little research on outbreak detection methods that are suited to large, multiple surveillance systems involving thousands of different organisms. Methods We obtained twenty years’ data on weekly counts of all infectious disease organisms reported to the UK’s Health Protection Agency. We summarized the mean frequencies, trends and seasonality of each organism using log-linear models. To identify a simple family of models which adequately represents all organisms, the Poisson model, the quasi-Poisson model and the negative binomial model were investigated (3,4). Formal goodness-of-fit tests were not used as they can be unreliable with sparse data. Adequacy of the models was empirically studied using the relationships between the mean, variance and skewness. For this purpose, each data series was first subdivided into 41 half-years and de-seasonalized. Results Trends and seasonality were summarized by plotting the distribution of estimated linear trend parameters for 2250 organisms, and modal seasonal period for 2254 organisms, including those organisms for which the seasonal effect is statistically significant. Relationships between mean and variance were summarized as given in Figure 1. Similar plots were used to summarize the relationships between mean and skewness. Conclusions Statistical outbreak detection models must be able to cope with seasonality and trends. The data analyses suggest that the great majority of organisms can adequately – though far from perfectly – be represented by a statistical model in which the variance is proportional to the mean, such as the quasi-Poisson or negative binomial models.
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Affiliation(s)
- Doyo G. Enki
- Mathematics and Statistics, The Open University, Milton Keynes, United Kingdom;,Doyo G. Enki, E-mail:
| | - Angela Noufaily
- Mathematics and Statistics, The Open University, Milton Keynes, United Kingdom
| | - C. P. Farrington
- Mathematics and Statistics, The Open University, Milton Keynes, United Kingdom
| | - Paul H. Garthwaite
- Mathematics and Statistics, The Open University, Milton Keynes, United Kingdom
| | - Nick Andrews
- Health Protection Agency, London, United Kingdom
| | | | - Chris Lane
- Health Protection Agency, London, United Kingdom
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Abstract
Outbreak detection systems for use with very large multiple surveillance databases must be suited both to the data available and to the requirements of full automation. To inform the development of more effective outbreak detection algorithms, we analyzed 20 years of data (1991-2011) from a large laboratory surveillance database used for outbreak detection in England and Wales. The data relate to 3,303 distinct types of infectious pathogens, with a frequency range spanning 6 orders of magnitude. Several hundred organism types were reported each week. We describe the diversity of seasonal patterns, trends, artifacts, and extra-Poisson variability to which an effective multiple laboratory-based outbreak detection system must adjust. We provide empirical information to guide the selection of simple statistical models for automated surveillance of multiple organisms, in the light of the key requirements of such outbreak detection systems, namely, robustness, flexibility, and sensitivity.
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Noufaily A, Enki DG, Farrington P, Garthwaite P, Andrews N, Charlett A. An improved algorithm for outbreak detection in multiple surveillance systems. Stat Med 2012; 32:1206-22. [PMID: 22941770 DOI: 10.1002/sim.5595] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Revised: 08/02/2012] [Accepted: 08/06/2012] [Indexed: 11/11/2022]
Abstract
In England and Wales, a large-scale multiple statistical surveillance system for infectious disease outbreaks has been in operation for nearly two decades. This system uses a robust quasi-Poisson regression algorithm to identify abberrances in weekly counts of isolates reported to the Health Protection Agency. In this paper, we review the performance of the system with a view to reducing the number of false reports, while retaining good power to detect genuine outbreaks. We undertook extensive simulations to evaluate the existing system in a range of contrasting scenarios. We suggest several improvements relating to the treatment of trends, seasonality, re-weighting of baselines and error structure. We validate these results by running the existing and proposed new systems in parallel on real data. We find that the new system greatly reduces the number of alarms while maintaining good overall performance and in some instances increasing the sensitivity.
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Affiliation(s)
- Angela Noufaily
- Department of Mathematics and Statistics, The Open University, Milton Keynes, UK.
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