Neutrophil-to-Lymphocyte Ratio and Platelet-to-Lymphocyte Ratio as Biomarkers in Axial Spondyloarthritis: Observational Studies From the Program to Understand the Longterm Outcomes in Spondyloarthritis Registry.

OBJECTIVES: This study was conducted to assess the utility of neutrophil-to-lymphocyte ratio (NLR) and platelet-to-lymphocyte ratio (PLR) in predicting radiographic sacroiliitis and active disease in axial spondyloarthritis (SpA) and to explore the association between use of a tumor necrosis factor inhibitor (TNFi) and these laboratory values compared with traditional inflammatory markers. METHODS: Observational data from the Program to Understand the Longterm Outcomes in Spondyloarthritis (PULSAR) registry were analyzed. We generated receiver operating characteristic curves to calculate laboratory cutoff values; we used these values in multivariable logistic regression models to identify associations with radiographically confirmed sacroiliitis and active disease. We also used logistic regression to determine the likelihood of elevated laboratory values after initiation of TNFi. RESULTS: Most study participants (n = 354) were White, male, and HLA-B27 positive. NLR (odds ratio [OR] 1.459, P = 0.034), PLR (OR 4.842, P < 0.001), erythrocyte sedimentation rate (OR 4.397, P < 0.001), and C-reactive protein (CRP) level (OR 2.911, P = 0.001) were independent predictors of radiographic sacroiliitis. Models that included PLR with traditional biomarkers performed better than those with traditional biomarkers alone. NLR (OR 6.931, P = 0.002) and CRP (OR 2.678, P = 0.004) were predictors of active disease, but the model that included both NLR and CRP performed better than CRP alone. TNFi use reduced the odds of elevated NLR (OR 0.172, P < 0.001), PLR (OR 0.073, P < 0.001), erythrocyte sedimentation rate (OR 0.319, P < 0.001), and CRP (OR 0.407, P < 0.001), but models that included NLR or PLR and traditional biomarkers performed best. CONCLUSIONS: These findings demonstrate an association between NLR and PLR and sacroiliitis and disease activity, with NLR and PLR showing response after TNFi treatment and adding useful clinical information to established biomarkers, thus perhaps assisting in management of axial SpA.

Rheum-CoV-2 Vaccination Case Series.

OBJECTIVES: In this case series, we present 5 cases of autoimmune rheumatic disease onset shortly after receiving mRNA vaccination against coronavirus disease 2019 (COVID-19). METHODS: We identified 5 patients from Brooke Army Medical Center who developed new manifestations of rheumatic disease following the second dose of the Pfizer-BioNTech or Moderna COVID-19 vaccinations. All patients were initially seen in primary care and then referred to rheumatology for further evaluation and management. Clinical data were obtained through review of the electronic medical record. RESULTS: Three cases involve elderly women with insidious onset of symmetric wrist and hand polyarthritis with seropositivity for rheumatoid factor. One case involves an elderly woman with a subacute onset of lower extremity-predominant, symmetric polyarthritis. One case involves an elderly man with insidious onset of bilateral shoulder and hip stiffness and arthralgias in the setting of elevated erythrocyte sedimentation rate and a rapid response to glucocorticoid therapy. CONCLUSION: Whether there exists a causal or contributory relationship between COVID-19 mRNA vaccination and the development of autoimmune rheumatic disease remains to be determined. Ultimately, further research is needed to establish if there is a true connection between the two.