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Speich B, Gryaznov D, Busse JW, Gloy VL, Lohner S, Klatte K, Taji Heravi A, Ghosh N, Lee H, Mansouri A, Marian IR, Saccilotto R, Nury E, Kasenda B, Ojeda–Ruiz E, Schandelmaier S, Tomonaga Y, Amstutz A, Pauli–Magnus C, Bischoff K, Wollmann K, Rehner L, Meerpohl JJ, Nordmann A, Wong J, Chow N, Hong PJ, Mc Cord – De Iaco K, Sricharoenchai S, Agarwal A, Schwenkglenks M, Hemkens LG, von Elm E, Copsey B, Griessbach AN, Schönenberger C, Mertz D, Blümle A, von Niederhäusern B, Hopewell S, Odutayo A, Briel M. Nonregistration, discontinuation, and nonpublication of randomized trials: A repeated metaresearch analysis. PLoS Med 2022; 19:e1003980. [PMID: 35476675 PMCID: PMC9094518 DOI: 10.1371/journal.pmed.1003980] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 05/11/2022] [Accepted: 04/01/2022] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND We previously found that 25% of 1,017 randomized clinical trials (RCTs) approved between 2000 and 2003 were discontinued prematurely, and 44% remained unpublished at a median of 12 years follow-up. We aimed to assess a decade later (1) whether rates of completion and publication have increased; (2) the extent to which nonpublished RCTs can be identified in trial registries; and (3) the association between reporting quality of protocols and premature discontinuation or nonpublication of RCTs. METHODS AND FINDINGS We included 326 RCT protocols approved in 2012 by research ethics committees in Switzerland, the United Kingdom, Germany, and Canada in this metaresearch study. Pilot, feasibility, and phase 1 studies were excluded. We extracted trial characteristics from each study protocol and systematically searched for corresponding trial registration (if not reported in the protocol) and full text publications until February 2022. For trial registrations, we searched the (i) World Health Organization: International Clinical Trial Registry Platform (ICTRP); (ii) US National Library of Medicine (ClinicalTrials.gov); (iii) European Union Drug Regulating Authorities Clinical Trials Database (EUCTR); (iv) ISRCTN registry; and (v) Google. For full text publications, we searched PubMed, Google Scholar, and Scopus. We recorded whether RCTs were registered, discontinued (including reason for discontinuation), and published. The reporting quality of RCT protocols was assessed with the 33-item SPIRIT checklist. We used multivariable logistic regression to examine the association between the independent variables protocol reporting quality, planned sample size, type of control (placebo versus other), reporting of any recruitment projection, single-center versus multicenter trials, and industry versus investigator sponsoring, with the 2 dependent variables: (1) publication of RCT results; and (2) trial discontinuation due to poor recruitment. Of the 326 included trials, 19 (6%) were unregistered. Ninety-eight trials (30%) were discontinued prematurely, most often due to poor recruitment (37%; 36/98). One in 5 trials (21%; 70/326) remained unpublished at 10 years follow-up, and 21% of unpublished trials (15/70) were unregistered. Twenty-three of 147 investigator-sponsored trials (16%) reported their results in a trial registry in contrast to 150 of 179 industry-sponsored trials (84%). The median proportion of reported SPIRIT items in included RCT protocols was 69% (interquartile range 61% to 77%). We found no variables associated with trial discontinuation; however, lower reporting quality of trial protocols was associated with nonpublication (odds ratio, 0.71 for each 10% increment in the proportion of SPIRIT items met; 95% confidence interval, 0.55 to 0.92; p = 0.009). Study limitations include that the moderate sample size may have limited the ability of our regression models to identify significant associations. CONCLUSIONS We have observed that rates of premature trial discontinuation have not changed in the past decade. Nonpublication of RCTs has declined but remains common; 21% of unpublished trials could not be identified in registries. Only 16% of investigator-sponsored trials reported results in a trial registry. Higher reporting quality of RCT protocols was associated with publication of results. Further efforts from all stakeholders are needed to improve efficiency and transparency of clinical research.
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Affiliation(s)
- Benjamin Speich
- Meta–Research Centre, Department of Clinical Research, University Hospital Basel, University of Basel, Basel, Switzerland
- Oxford Clinical Trials Research Unit / Centre for Statistics in Medicine, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, United Kingdom
- * E-mail:
| | - Dmitry Gryaznov
- Meta–Research Centre, Department of Clinical Research, University Hospital Basel, University of Basel, Basel, Switzerland
| | - Jason W. Busse
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Canada
- Department of Anesthesia, McMaster University, Hamilton, Canada
| | - Viktoria L. Gloy
- Meta–Research Centre, Department of Clinical Research, University Hospital Basel, University of Basel, Basel, Switzerland
| | - Szimonetta Lohner
- Cochrane Hungary, Clinical Centre of the University of Pécs, Medical School, University of Pécs, Pécs, Hungary
- Department of Public Health Medicine, Medical School, University of Pécs, Pécs, Hungary
| | - Katharina Klatte
- Clinical Trial Unit, Department of Clinical Research, University of Basel and University Hospital Basel, Basel, Switzerland
| | - Ala Taji Heravi
- Meta–Research Centre, Department of Clinical Research, University Hospital Basel, University of Basel, Basel, Switzerland
- Swiss Tropical and Public Health Institute, Basel, Switzerland
| | - Nilabh Ghosh
- Meta–Research Centre, Department of Clinical Research, University Hospital Basel, University of Basel, Basel, Switzerland
| | - Hopin Lee
- Oxford Clinical Trials Research Unit / Centre for Statistics in Medicine, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, United Kingdom
| | - Anita Mansouri
- Oxford Clinical Trials Research Unit / Centre for Statistics in Medicine, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, United Kingdom
| | - Ioana R. Marian
- Oxford Clinical Trials Research Unit / Centre for Statistics in Medicine, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, United Kingdom
| | - Ramon Saccilotto
- Clinical Trial Unit, Department of Clinical Research, University of Basel and University Hospital Basel, Basel, Switzerland
| | - Edris Nury
- Institute for Evidence in Medicine (for Cochrane Germany Foundation), Faculty of Medicine and Medical Center, University of Freiburg, Freiburg, Germany
- Department of General Practice and Primary Care, Medical Center Hamburg–Eppendorf–UKE, Hamburg, Germany
| | - Benjamin Kasenda
- Department of Medical Oncology, University of Basel and University Hospital Basel, Basel, Switzerland
| | - Elena Ojeda–Ruiz
- Meta–Research Centre, Department of Clinical Research, University Hospital Basel, University of Basel, Basel, Switzerland
- Bioaraba Health Research Institute, Health Prevention, Promotion and Care Area; Osakidetza Basque Health Service, Araba University Hospital, Preventive Medicine Department, Vitoria–Gasteiz, Spain
| | - Stefan Schandelmaier
- Meta–Research Centre, Department of Clinical Research, University Hospital Basel, University of Basel, Basel, Switzerland
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Canada
| | - Yuki Tomonaga
- Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Zurich, Switzerland
| | - Alain Amstutz
- Meta–Research Centre, Department of Clinical Research, University Hospital Basel, University of Basel, Basel, Switzerland
- Swiss Tropical and Public Health Institute, Basel, Switzerland
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Basel, Basel, Switzerland
| | - Christiane Pauli–Magnus
- Clinical Trial Unit, Department of Clinical Research, University of Basel and University Hospital Basel, Basel, Switzerland
| | - Karin Bischoff
- Institute for Evidence in Medicine, Medical Center–University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
- Cochrane Germany, Cochrane Germany Foundation, Freiburg, Germany
| | | | - Laura Rehner
- Institute for Evidence in Medicine, Medical Center–University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
- Institute for Nursing Science and Interprofessional Learning, University Medicine Greifswald, Greifswald, Germany
| | - Joerg J. Meerpohl
- Institute for Evidence in Medicine, Medical Center–University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
- Cochrane Germany, Cochrane Germany Foundation, Freiburg, Germany
| | - Alain Nordmann
- Meta–Research Centre, Department of Clinical Research, University Hospital Basel, University of Basel, Basel, Switzerland
| | - Jacqueline Wong
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Canada
| | - Ngai Chow
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Canada
| | - Patrick Jiho Hong
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Canada
- Department of Anesthesiology and Pain Medicine, University of Toronto, Toronto, Canada
| | - Kimberly Mc Cord – De Iaco
- Meta–Research Centre, Department of Clinical Research, University Hospital Basel, University of Basel, Basel, Switzerland
- Multifactorial and Complex Diseases Research Area, Bambino Gesù Children’s Hospital IRCCS, Rome, Italy
| | - Sirintip Sricharoenchai
- Meta–Research Centre, Department of Clinical Research, University Hospital Basel, University of Basel, Basel, Switzerland
| | - Arnav Agarwal
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Canada
- Division of General Internal Medicine, Department of Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Matthias Schwenkglenks
- Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Zurich, Switzerland
- Institute of Pharmaceutical Medicine (ECPM), University of Basel, Basel, Switzerland
| | - Lars G. Hemkens
- Meta–Research Centre, Department of Clinical Research, University Hospital Basel, University of Basel, Basel, Switzerland
- Meta–Research Innovation Center Berlin (METRICS–B), Berlin Institute of Health, Berlin, Germany
- Meta–Research Innovation Center at Stanford (METRICS), Stanford University, Stanford, California, United States of America
| | - Erik von Elm
- Cochrane Switzerland, Centre for Primary Care and Public Health (Unisanté), University of Lausanne, Lausanne, Switzerland
| | - Bethan Copsey
- Oxford Clinical Trials Research Unit / Centre for Statistics in Medicine, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, United Kingdom
| | - Alexandra N. Griessbach
- Meta–Research Centre, Department of Clinical Research, University Hospital Basel, University of Basel, Basel, Switzerland
| | - Christof Schönenberger
- Meta–Research Centre, Department of Clinical Research, University Hospital Basel, University of Basel, Basel, Switzerland
| | - Dominik Mertz
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Canada
- Department of Medicine, McMaster University, Hamilton, Canada
| | - Anette Blümle
- Swiss Tropical and Public Health Institute, Basel, Switzerland
- Clinical Trials Unit, Faculty of Medicine and Medical Center, University of Freiburg, Freiburg, Germany
| | - Belinda von Niederhäusern
- Department of Public Health Medicine, Medical School, University of Pécs, Pécs, Hungary
- Roche Pharma AG, Grenzach–Wyhlen, Germany
| | - Sally Hopewell
- Oxford Clinical Trials Research Unit / Centre for Statistics in Medicine, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, United Kingdom
| | - Ayodele Odutayo
- Oxford Clinical Trials Research Unit / Centre for Statistics in Medicine, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, United Kingdom
- Applied Health Research Centre, Li Ka Shing Knowledge Institute of St Michael’s Hospital, Toronto, Ontario, Canada
| | - Matthias Briel
- Meta–Research Centre, Department of Clinical Research, University Hospital Basel, University of Basel, Basel, Switzerland
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Canada
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Mettang T, Pauli–Magnus C, Alscher DM, Kirchgessner J, Wodarz R, Rettenmeier AW, Kuhlmann U. Influence of Plasticizer-Free CAPD Bags and Tubings on Serum, Urine, and Dialysate Levels of Phthalic Acid Esters in CAPD Patients. Perit Dial Int 2020. [DOI: 10.1177/089686080002000115] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Objectives To evaluate the impact of a plasticizer-free device on exposure to di-(2-ethylhexyl) phthalate (DEHP) and its major metabolites in patients on continuous ambulatory peritoneal dialysis (CAPD). DEHP is the most commonly used plasticizer in polyvinyl chloride (PVC) products; it is added to CAPD bags in order to improve the flexibility of the material. Since DEHP leaches out of the plastic matrix, patients on CAPD are exposed to considerable amounts of DEHP and its metabolites. Design A prospective cross-over study. Setting Department of nephrology in a teaching hospital. Participants Six patients (4 female, 2 male) stable on peritoneal dialysis (PD) for at least 6 months. Interventions Patients were switched from a plasticizer-containing PVC CAPD system (A.N.D.Y. Plus, Fresenius Medical Care, Bad Homburg, Germany) to a polyolefine-made plasticizer-free system (stay-safe, Fresenius). Main Outcome Measures Prior to and 42 days after the switch, 24-hour effluent dialysate and urine collections were performed and 10 mL blood was drawn. Concentrations of DEHP, mono-(2-ethylhexyl) phthalate (MEHP), phthalic acid (PA), and 2-ethylhexanol (2-EH) in urine, dialysate, and serum were determined using gas chromatography/mass spectrometry. Results Complete data were obtained from 5 patients. Serum levels of PA decreased significantly during the study period (0.137 ± 0.078 mg/L vs 0.124 ± 0.049 mg/L, p = 0.04), and the respective levels of DEHP decreased insignificantly (0.097 ± 0.076 mg/L vs 0.069 ± 0.046 mg/L, p = 0.07), whereas the concentrations of MEHP and 2-EH remained unchanged. Urine concentrations of PA were high (0.81 ± 0.69 mg/L) but did not change substantially (0.70 ± 0.50 mg/L). Effluent dialysate concentrations of MEHP and PA decreased significantly (0.0176 ± 0.004 mg/L vs 0.0040 ± 0.0007 mg/L, p = 0.043 and 0.158 ± 0.056 mg/L vs 0.111 ± 0.051 mg/L, p = 0.043, respectively). Conclusions Although PD patients seem to be exposed to other sources of phthalates in addition to dialysis, use of plasticizer-free devices may help to reduce potentially immunosuppressive exposure to phthalate esters.
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Affiliation(s)
- Thomas Mettang
- Division of Nephrology, Department of Internal Medicine, Robert Bosch Hospital, Stuttgart
| | | | - Dominik Mark Alscher
- Division of Nephrology, Department of Internal Medicine, Robert Bosch Hospital, Stuttgart
| | | | - Roman Wodarz
- Department of Occupational and Social Medicine, University of Tuebingen, Tuebingen
| | - Albert W. Rettenmeier
- Department of Hygiene and Occupational Medicine, University of Essen, Essen, Germany
| | - Ulrich Kuhlmann
- Division of Nephrology, Department of Internal Medicine, Robert Bosch Hospital, Stuttgart
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