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Higher systemic immune-inflammation index values are associated with patients diagnosed with rheumatic diseasesNew marker shows inflammation levels in rheumatic disease patients

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Key Takeaway
Note that higher systemic immune-inflammation index (SII) levels are associated with rheumatic diseases.

This meta-analysis evaluated the association between the systemic immune-inflammation index (SII) and rheumatic diseases (RDs). The analysis included 6,903 patients with RD and 6,724 healthy controls to determine if SII levels could serve as a measurable indicator in this patient population.

The synthesis found that patients with rheumatic diseases had significantly higher SII values compared to healthy controls (SMD = 0.83; 95% CI 0.69 to 0.97). These findings suggest that the systemic immune-inflammation index may serve as a potential adjunctive biomarker for both the diagnosis and ongoing monitoring of patients with rheumatic diseases.

While the association is statistically significant, the evidence is based on observational data rather than an intervention trial. Therefore, SII should not be considered a standalone diagnostic tool or a predictor of specific clinical outcomes at this time. The scope of the analysis was limited to comparing SII values between patient and control groups without reporting specific follow-up durations or adverse events.

Living with a rheumatic disease often means dealing with constant, underlying inflammation. Doctors are looking for clearer ways to track this internal activity. A large study of over 6,000 patients found that a specific marker called the systemic immune-inflammation index (SII) is significantly higher in people with these conditions compared to healthy individuals.

The researchers looked at thousands of cases to see how this marker behaved. The results showed a clear difference in SII levels between those with rheumatic diseases and those without. This suggests that the SII could be a helpful tool for doctors to help identify the condition or monitor how well a patient is doing over time.

While these findings are promising, it is important to remember that this was an observational study of markers, not a test of a new treatment. The index shows a strong link between inflammation and disease, but it is currently viewed as a potential extra tool for doctors rather than a standalone diagnostic test.

What this means for you:
Higher immune-inflammation levels are linked to rheumatic diseases and could help doctors monitor patient health.

Common questions

What is the systemic immune-inflammation index?

The systemic immune-inflammation index (SII) is a marker used to measure inflammation in the body. In this study, patients with rheumatic diseases showed significantly higher SII values than healthy people. It may help doctors monitor how much inflammation is present in a patient's system.

How does this finding help people with rheumatic diseases?

This finding suggests that the SII could be used as an extra tool for doctors. It might help them better identify the disease or monitor how it progresses over time by providing a clear look at immune-inflammation levels in the body.

Is this a new treatment for rheumatic diseases?

No, this is not a new medication or treatment. The study looked at an existing marker to see if it could help doctors track disease activity. You should speak with your doctor about how these markers apply to your specific care plan.

Study Details

Study typeMeta analysis
EvidenceLevel 1
PublishedJul 2026
View Original Abstract ↓
IntroductionAccessible biomarkers that reflect immune-inflammatory activity may support the diagnosis and monitoring of patients with rheumatic diseases (RDs). We conducted a systematic review and meta-analysis to investigate the systemic immune-inflammation index (SII), a hematological index derived from standard full blood count parameters and calculated as (neutrophil count x platelet count)/lymphocyte count, as a potential adjunctive biomarker in RDs.MethodsWe searched PubMed, Web of Science, and Scopus from inception to 27 May 2026 for studies investigating the SII in patients with RDs and healthy controls. We assessed the risk of bias using the Joanna Briggs Institute Critical Appraisal Checklist for analytical studies and the certainty of evidence using the Grading of Recommendations, Assessment, Development and Evaluation Working Group system. ResultsIn 52 studies (6,903 patients with RDs, mean age 47.9 years, 55% female, and 6,724 healthy controls, mean age 44.6 years, 45% female), compared with controls, RDs patients had significantly higher SII values (standardized mean difference, SMD = 0.83, 95% CI 0.69 to 0.97; p
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