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Hujoel IA, Jansson-Knodell CL, Hujoel PP, Hujoel MLA, Choung RS, Murray JA, Rubio-Tapia A. Estimating the Impact of Verification Bias on Celiac Disease Testing. J Clin Gastroenterol 2021; 55:327-334. [PMID: 32433257 PMCID: PMC7674196 DOI: 10.1097/mcg.0000000000001361] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Accepted: 04/06/2020] [Indexed: 01/19/2023]
Abstract
GOAL The goal of this study was to estimate the impact of verification bias on the diagnostic accuracy of immunoglobulin A tissue transglutaminase (IgA tTG) in detecting celiac disease as reported by an authoritative meta-analysis, the 2016 Comparative Effectiveness Review (CER). BACKGROUND Verification bias is introduced to diagnostic accuracy studies when screening test results impact the decision to verify disease status. MATERIALS AND METHODS We adjusted the sensitivity and specificity of IgA tTG reported by the 2016 CER with the proportion of IgA tTG positive and negative individuals who are referred for confirmatory small bowel biopsy. We performed a systematic review from January 1, 2007, to July 19, 2017, to determine these referral rates. RESULTS The systematic review identified 793 articles of which 9 met inclusion criteria (n=36,477). Overall, 3.6% [95% confidence interval (CI): 1.1%-10.9%] of IgA tTG negative and 79.2.2% (95% CI: 65.0%-88.7%) of IgA tTG positive individuals were referred for biopsy. Adjusting for these referral rates the 2016 CER reported sensitivity of IgA tTG dropped from 92.6% (95% CI: 90.2%-94.5%) to 57.1% (95% CI: 35.4%-76.4%) and the specificity increased from 97.6% (95% CI: 96.3%-98.5%) to 99.6% (95% CI: 98.4%-99.9%). CONCLUSIONS The CER may have largely overestimated the sensitivity of IgA tTG due to a failure to account for verification bias. These findings suggest caution in the interpretation of a negative IgA tTG to rule out celiac disease in clinical practice. More broadly, they highlight the impact of verification bias on diagnostic accuracy estimates and suggest that studies at risk for this bias be excluded from systematic reviews.
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Affiliation(s)
- Isabel A. Hujoel
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, 55905
| | | | - Philippe P. Hujoel
- Department of Epidemiology, School of Public Health, University of Washington, Seattle, WA, 98195
| | - Margaux L. A. Hujoel
- Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, MA 02215
| | - Rok Seon Choung
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, 55905
| | - Joseph A. Murray
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, 55905
| | - Alberto Rubio-Tapia
- Department of Gastroenterology and Hepatology, Cleveland Clinic, Cleveland, OH, 44103
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Elli L, Ferretti F, Orlando S, Vecchi M, Monguzzi E, Roncoroni L, Schuppan D. Management of celiac disease in daily clinical practice. Eur J Intern Med 2019; 61:15-24. [PMID: 30528262 DOI: 10.1016/j.ejim.2018.11.012] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/07/2018] [Revised: 11/06/2018] [Accepted: 11/27/2018] [Indexed: 02/06/2023]
Abstract
Celiac disease (CD) is the most common autoimmune enteropathy worldwide. In CD, dietary gluten triggers a T cell driven small intestinal inflammation in a subset of genetically predisposed subjects, expressing the HLA DQ2 and/or DQ8 genes on their antigen presenting cells. HLA DQ2/DQ8 can bind gluten peptides after their prior modification by the CD autoantigen, tissue transglutaminase (TG2). This process leads to the activation of gluten reactive T cells, small bowel villous atrophy, crypt hyperplasia and intraepithelial lymphocytosis, the histological hallmarks of CD. The clinical picture of CD is extremely heterogeneous including intestinal (especially diarrhea, abdominal pain, bloating) and extraintestinal (especially associated autoimmune diseases, anemia, osteoporosis) manifestations. The prevalence of CD in most parts of the world is estimated at 1:100-1:150 and its diagnosis is based on the presence of circulating autoantibodies (anti-TG2) and the histological detection of villous atrophy. Treatment is a lifelong gluten free diet but adjunctive therapies are in development. Although CD is a well-characterized disease, it is grossly underdiagnosed, despite the severe consequences of long-term gluten ingestion in CD, such as enhanced autoimmunity, refractory CD and intestinal T cell lymphoma. The aim of the presented review is to provide a clinical guide and to summarize the most recent clinical progress in CD research.
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Affiliation(s)
- Luca Elli
- Center for Prevention and Diagnosis of Celiac Disease, Division of Gastroenterology and Endoscopy, Fondazione IRCCS Ca'Granda Ospedale Maggiore Policlinico, Via F. Sforza 35, 20122 Milano, Italy.
| | - Francesca Ferretti
- Center for Prevention and Diagnosis of Celiac Disease, Division of Gastroenterology and Endoscopy, Fondazione IRCCS Ca'Granda Ospedale Maggiore Policlinico, Via F. Sforza 35, 20122 Milano, Italy; Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Via Festa del Perdono, 20122 Milano, Italy
| | - Stefania Orlando
- Center for Prevention and Diagnosis of Celiac Disease, Division of Gastroenterology and Endoscopy, Fondazione IRCCS Ca'Granda Ospedale Maggiore Policlinico, Via F. Sforza 35, 20122 Milano, Italy
| | - Maurizio Vecchi
- Center for Prevention and Diagnosis of Celiac Disease, Division of Gastroenterology and Endoscopy, Fondazione IRCCS Ca'Granda Ospedale Maggiore Policlinico, Via F. Sforza 35, 20122 Milano, Italy; Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Via Festa del Perdono, 20122 Milano, Italy
| | - Erika Monguzzi
- Center for Prevention and Diagnosis of Celiac Disease, Division of Gastroenterology and Endoscopy, Fondazione IRCCS Ca'Granda Ospedale Maggiore Policlinico, Via F. Sforza 35, 20122 Milano, Italy; Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Via Festa del Perdono, 20122 Milano, Italy; Institute for Translational Immunology, Research Center for Immunotherapy (FZI), Johannes Gutenberg University (JGU) Medical Center, 55101 Mainz, Germany
| | - Leda Roncoroni
- Center for Prevention and Diagnosis of Celiac Disease, Division of Gastroenterology and Endoscopy, Fondazione IRCCS Ca'Granda Ospedale Maggiore Policlinico, Via F. Sforza 35, 20122 Milano, Italy; Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Via Festa del Perdono, 20122 Milano, Italy; Department of Biomedical, Surgical and Dental Sciences, Università degli Studi di Milano, Via Festa del Perdono, 20122 Milano, Italy
| | - Detlef Schuppan
- Institute for Translational Immunology, Research Center for Immunotherapy (FZI), Johannes Gutenberg University (JGU) Medical Center, 55101 Mainz, Germany; Division of Gastroenterology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
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Fukunaga M, Ishimura N, Fukuyama C, Izumi D, Ishikawa N, Araki A, Oka A, Mishiro T, Ishihara S, Maruyama R, Adachi K, Kinoshita Y. Celiac disease in non-clinical populations of Japan. J Gastroenterol 2018; 53:208-214. [PMID: 28389733 DOI: 10.1007/s00535-017-1339-9] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2016] [Accepted: 03/28/2017] [Indexed: 02/04/2023]
Abstract
BACKGROUND Celiac disease is a chronic autoimmune enteropathy caused by gluten ingestion. While its prevalence in Western countries is reported to be as high as 1%, the prevalence has not been evaluated in a large-scale study of a Japanese population. The aim of our study was to clarify the possible presence of celiac disease in a Japanese non-clinical population as well as in patients showing symptoms suggestive of the disease. METHODS Serum samples were collected from 2008 non-clinical adults and 47 patients with chronic unexplained abdominal symptoms between April 2014 and June 2016. The anti-tissue transglutaminase (TTG) immunoglobulin A antibody titer was determined as a screening test for celiac disease in all subjects, and individuals with a value of >2 U/mL subsequently underwent testing for the presence of serum endomysial IgA antibody (EMA) as confirmation. Those testing positive for EMA or with a high concentration (>10 U/mL) of TTG were further investigated by histopathological examinations of duodenal mucosal biopsy specimens and HLA typing tests. RESULTS Of the 2008 non-clinical adults from whom serum samples were collected, 161 tested positive for TTG, and all tested negative for EMA. Four subjects who had a high TTG titer were invited to undergo confirmatory testing, and the histopathological results confirmed the presence of celiac disease in only a single case (0.05%). Of the 47 symptomatic patients, one (2.1%) was found to have a high TTG titer and was diagnosed with celiac disease based on duodenal histopathological findings. CONCLUSION The presence of celiac disease in a non-clinical Japanese population was low at 0.05% and was rarely found in patients with unexplained chronic abdominal symptoms.
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Affiliation(s)
- Mai Fukunaga
- Department of Gastroenterology and Hepatology, Shimane University School of Medicine, 89-1 Enya-cho, Izumo, Shimane, 693-8501, Japan
| | - Norihisa Ishimura
- Department of Gastroenterology and Hepatology, Shimane University School of Medicine, 89-1 Enya-cho, Izumo, Shimane, 693-8501, Japan.
| | - Chika Fukuyama
- Department of Gastroenterology and Hepatology, Shimane University School of Medicine, 89-1 Enya-cho, Izumo, Shimane, 693-8501, Japan
| | - Daisuke Izumi
- Department of Gastroenterology and Hepatology, Shimane University School of Medicine, 89-1 Enya-cho, Izumo, Shimane, 693-8501, Japan
| | - Nahoko Ishikawa
- Department of Pathology, Shimane University School of Medicine, Izumo, Japan
| | - Asuka Araki
- Department of Pathology, Shimane University School of Medicine, Izumo, Japan
| | - Akihiko Oka
- Department of Gastroenterology and Hepatology, Shimane University School of Medicine, 89-1 Enya-cho, Izumo, Shimane, 693-8501, Japan
| | - Tomoko Mishiro
- Health Center, Shimane Environment and Health Public Corporation, Matsue, Japan
| | - Shunji Ishihara
- Department of Gastroenterology and Hepatology, Shimane University School of Medicine, 89-1 Enya-cho, Izumo, Shimane, 693-8501, Japan
| | - Riruke Maruyama
- Department of Pathology, Shimane University School of Medicine, Izumo, Japan
| | - Kyoichi Adachi
- Health Center, Shimane Environment and Health Public Corporation, Matsue, Japan
| | - Yoshikazu Kinoshita
- Department of Gastroenterology and Hepatology, Shimane University School of Medicine, 89-1 Enya-cho, Izumo, Shimane, 693-8501, Japan
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Cui C, Basen T, Philipp AT, Yusin J, Krishnaswamy G. Celiac disease and nonceliac gluten sensitivity. Ann Allergy Asthma Immunol 2017; 118:389-393. [PMID: 28390579 DOI: 10.1016/j.anai.2017.01.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Revised: 01/08/2017] [Accepted: 01/09/2017] [Indexed: 12/16/2022]
Affiliation(s)
- Chongwei Cui
- Department of Allergy and Immunology, Veterans Affairs Greater Los Angeles Healthcare System, Los Angeles, California
| | - Tyler Basen
- Department of Allergy and Immunology, Veterans Affairs Greater Los Angeles Healthcare System, Los Angeles, California
| | - Ami Thakor Philipp
- Department of Allergy and Immunology, Veterans Affairs Greater Los Angeles Healthcare System, Los Angeles, California
| | - Joseph Yusin
- Department of Allergy and Immunology, Veterans Affairs Greater Los Angeles Healthcare System, Los Angeles, California
| | - Guha Krishnaswamy
- Wake Forest School of Medicine and Wake Baptist Hospital, Winston Salem, North Carolina; W.G. (Bill) Hefner Veterans Affairs Medical Center and Affiliated Clinics, Salisbury, North Carolina.
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[Diagnostic approach to iron deficiency anemia]. Wien Med Wochenschr 2016; 166:402-410. [PMID: 27565993 DOI: 10.1007/s10354-016-0495-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Accepted: 07/11/2016] [Indexed: 10/21/2022]
Abstract
Anemia affects a fourth of the global population, with iron deficiency remaining the primary cause. It is associated with diminished work capacity, fatigue, impaired cognitive function, and can negatively impact the course of diseases like chronic heart failure or chronic kidney disease. Treatment options include oral and intravenous iron; however, conditions such as inflammatory bowel disease, celiac disease, or autoimmune gastritis can diminish the efficacy of oral iron. Timely recognition of iron deficiency anemia and administration of appropriate therapy not only improves quality of life, but also reduces the need for blood transfusions. Proper selection of iron-deficient patients for whom further diagnostic testing is necessary facilitates identification of underlying diseases that require specific treatment, and avoids unnecessary invasive testing.
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