Additional findings
Notably, the primary analysis excluded patients diagnosed with JIA or RA before their celiac disease diagnosis. In additional analyses, however, significant associations emerged.
Among children with celiac disease, 0.5% had a previous diagnosis of JIA, compared with 0.1% of matched comparators. Those with celiac disease were 3.5 times more likely to have a JIA diagnosis.
Among adults with celiac disease, 0.9% had a previous diagnosis of RA, compared with 0.6% of matched comparators. Those with celiac disease were 1.4 times more likely to have a RA diagnosis.
“We found that diagnoses of these types of arthritis were more common before a diagnosis of celiac disease compared to the general population,” Benjamin Lebwohl, MD, director of clinical research at the Celiac Disease Center at Columbia University, New York, told this news organization.
“This suggests that undiagnosed and untreated celiac disease might be contributing to these others autoimmune conditions,” he said.
Dr. Doyle and Dr. Lebwohl emphasized the practical implications for clinicians caring for patients with celiac disease. Among patients with celiac disease and inflammatory joint symptoms, clinicians should have a low threshold to evaluate for JIA or RA, they said.
“Particularly in pediatrics, we are trained to screen patients with JIA for celiac disease, but this study points to the possible bidirectional association and the importance of maintaining a clinical suspicion for JIA and RA among established celiac disease patients,” Marisa Stahl, MD, assistant professor of pediatrics and associate program director of the pediatric gastroenterology, hepatology, and nutrition fellowship training program at the University of Colorado at Denver, Aurora, said in an interview.
Dr. Stahl, who wasn’t involved with this study, conducts research at the Colorado Center for Celiac Disease. She and colleagues are focused on understanding the genetic and environmental factors that lead to the development of celiac disease and other autoimmune diseases.
Given the clear association between celiac disease and other autoimmune diseases, Dr. Stahl agreed that clinicians should have a low threshold for screening, with “additional workup for other autoimmune diseases once an autoimmune diagnosis is established.”
The study was supported by Karolinska Institutet and the Swedish Research Council. Dr. Lebwohl coordinates a study on behalf of the Swedish IBD quality register, which has received funding from Janssen. The other authors declared no conflicts of interest. Dr. Stahl reported no relevant disclosures.
A version of this article first appeared on Medscape.com.