The Celiac Disease and Diabetes-Dietary Intervention and Evaluation Trial (CD-DIET) protocol: a randomised controlled study to evaluate treatment of asymptomatic coeliac disease in type 1 diabetes

Farid H Mahmud, Emilia N De Melo, Karima Noordin, Esther Assor, Kamaljeet Sahota, Jolie Davies-Shaw, Ernest Cutz, Gino Somers, Margaret Lawson, David R Mack, Patricia Gallego, Charlotte McDonald, Melanie D Beaton, Kevin Bax, Fred Saibil, Jeremy Gilbert, Susan Kirsch, Bruce A Perkins, Maria Cino, Eva Szentgyorgyi, Dror Koltin, Amish Parikh, Geetha Mukerji, Andrew Advani, Olivia Lou, Margaret A Marcon, Farid H Mahmud, Emilia N De Melo, Karima Noordin, Esther Assor, Kamaljeet Sahota, Jolie Davies-Shaw, Ernest Cutz, Gino Somers, Margaret Lawson, David R Mack, Patricia Gallego, Charlotte McDonald, Melanie D Beaton, Kevin Bax, Fred Saibil, Jeremy Gilbert, Susan Kirsch, Bruce A Perkins, Maria Cino, Eva Szentgyorgyi, Dror Koltin, Amish Parikh, Geetha Mukerji, Andrew Advani, Olivia Lou, Margaret A Marcon

Abstract

Introduction: Coeliac disease (CD) is an autoimmune condition characterised by gluten-induced intestinal inflammation, and observed at a 5-10 fold greater prevalence in type 1 diabetes. While universal screening for CD in patients with diabetes is frequently advocated, objective data is limited as to benefits on diabetes control, bone health or quality of life related to the adoption of a gluten-free diet (GFD) in the large proportion of patients with diabetes with asymptomatic CD. The Celiac Disease and Diabetes-Dietary Intervention and Evaluation Trial (CD-DIET) study is a multicenter, randomised controlled trial to evaluate the efficacy and safety of a GFD in patients with type 1 diabetes with asymptomatic CD.

Methods and analysis: Children and adults (8-45 years) with type 1 diabetes will be screened for asymptomatic CD. Eligible patients with biopsy-proven CD will be randomly assigned in a 1:1 ratio to treatment with a GFD for 1 year, or continue with a gluten-containing diet. The primary outcome will evaluate the impact of the GFD on change in glycated haemoglobin. Secondary outcomes will evaluate changes in bone mineral density, blood glucose variability and health-related quality of life between GFD-treated and the regular diet group over a 1-year period. The study was initiated in 2012 and has subsequently expanded to multiple paediatric and adult centres in Ontario, Canada.

Ethics and dissemination: The findings from this study will provide high-quality evidence as to the impact of GFD treatment on glycaemic control and complications in asymptomatic children and adults with CD and type 1 diabetes.

Trial registration number: NCT01566110.

Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions.

Figures

Figure 1
Figure 1
Flow diagram illustrating screening phase and eligibility for intervention phase for Celiac Disease and Diabetes-Dietary Intervention and Evaluation Trial (CD-DIET) study (T1D, type 1 diabetes; TTG-IgA, tissue transglutaminase immunoglobulin A).
Figure 2
Figure 2
Intervention phase—outcomes and safety (BMD, bone mineral density; HbA1c, glycated haemoglobin; TTG-IgA, tissue transglutaminase immunoglobulin A).

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Source: PubMed

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