Vitamin D, an inflammatory activity marker for spondyloarthritis?

In this study, a relationship between low levels of vitamin D and other markers of inflammation is observed in patients with spondyloarthritis. Therefore, insufficient levels of vitamin D could be used as a marker of inflammation, so they would help to have a better follow-up of the patient.
Purpose: The aim of this study is to determine the association between 25-hydroxyvitamin D deficiency and level of disease activity in patients suffering from spondyloarthritis.
Methodology: This study is an observational, descriptive and transversal study. A retrospective review of patients with spondyloarthritis under treatment at the Rheumatology Department of Hospital General Universitario de Ciudad Real between September 2016 and September 2018 is under consideration. The association between 25-hydroxyvitamin D deficiency and levels of disease activity was calculated using odds ratio (OR) with a 95% confidence level.
Results: Initial study developments are reported. A group of 147 patients was analyzed. The average disease activity was 4.3 (according to BASDAI) and 11.4 (according to DAPSA). Twenty-eight percent of patients showed increased levels of acute-phase reactants, and 82% exhibited 25-hydroxyvitamin D deficiency/insufficiency. Analysis of the association between vitamin D deficiency/insufficiency and BASDAI/DAPSA activity degree revealed an OR of 7.9 (CI95%: 2.92-21.23, p = < 0.0001).
Conclusion: In this study, an association was found between those patients with spondyloarthritis who had a 25-hydroxyvitamin D deficiency and disease activity. Despite these results, a 1-year follow-up of these patients using two or more measurements of activity and 25-hydroxyvitamin D levels would be needed to corroborate these data.