A new study shows that rheumatoid arthritis (RA) is associated with a 23 percent increased risk of type 2 diabetes (T2D), and may indicate that both diseases are linked to the body's inflammatory response.

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The research was conducted by Zixing Tian and Dr. Adrian Heald, University of Manchester, UK, and colleagues. Inflammation has emerged as a key factor in the onset and progression of T2D, and RA is an autoimmune and inflammatory disease. The team suggests that the systemic inflammation associated with RA might therefore contribute to the risk of individuals developing diabetes in the future.

The team conducted a comprehensive search of a range of medical and scientific databases up to March 10, 2020, for cohort studies comparing the incidence of T2D among people with RA to the diabetes risk within the general population. Statistical analyses were performed to calculate the relative risks, as well as to test for possible publication bias (in which the outcome of research influences the decision of whether to publish it or not).

The eligible studies identified comprised a total of 1,629,854 participants. Most of the studies were population-based and one was hospital-based, while no evidence was found for publication bias in any of them. The authors found that having RA was associated with a 23 percent higher chance of developing T2D, compared to the diabetes risk within the general population. "This finding supports the notion that inflammatory pathways are involved in the pathogenesis of diabetes," the authors said. "We suggest that more intensive screening and management of diabetes risk factors should be considered in people with rheumatoid arthritis. Agents that reduce systemic inflammatory marker levels may have a role in preventing type 2 diabetes. This may involve focussing on more than one pathway at a time," the researchers stated.