Researchers wanted to understand if levels of a specific antibody called anti-CXCR3 were connected to autoimmune diseases and heart disease. They studied 84 people with early rheumatoid arthritis, 12 with joint pain, 65 healthy controls, 103 with established rheumatoid arthritis, and 44 with Sjögren's disease. They measured antibody levels in the blood and looked at heart disease using scans.
The study found that people with early rheumatoid arthritis and joint pain had lower levels of these antibodies compared to healthy people. Lower antibody levels were also linked to having more heart disease and to poorer responses to standard arthritis medications after 6 and 12 months. When this antibody information was added to a standard heart risk score, it seemed to improve the score's accuracy.
This was an observational study, which means it can only show connections, not prove that low antibody levels cause heart disease or poor treatment outcomes. The study did not report on safety issues related to the antibody measurements. The results are a first step, suggesting this antibody might be a useful marker for doctors to monitor, but much more research is needed before it could be used in regular patient care.