Data-driven classification of primary Sjögren's syndrome: From cluster analysis to clinical immune phenotypes and predictive biomarkers.

Sjögren's syndrome is an autoimmune condition that primarily affects moisture-producing glands, causing dry eyes and mouth, but can also involve other body systems. Researchers studied 1,087 patients with primary Sjögren's syndrome to better understand how the disease varies between people. Using advanced data analysis, they identified two distinct types of the condition: one group (55%) had widespread inflammation affecting multiple body systems, particularly the muscles and joints, with very high inflammatory markers in their blood; the other group (45%) had disease mostly limited to the glands with higher immunoglobulin levels but less system-wide involvement. The researchers found that rheumatoid factor (an antibody in the blood) strongly correlated with joint and muscle problems. They also discovered that men, those with elevated potassium levels, and those with high rheumatoid factor were more likely to have the multi-system inflammatory type. For patients considering acupuncture, this classification matters because treatment approaches may need to differ based on disease subtype. Those with the multi-system inflammatory type experience significant musculoskeletal pain and may particularly benefit from acupuncture's known effects on pain relief and inflammation reduction. The glandular-limited type might respond to acupuncture protocols targeting dry mouth and eye symptoms, which some studies suggest acupuncture can improve. Understanding your specific disease pattern can help acupuncturists develop more targeted treatment plans addressing your particular symptoms and inflammatory profile. Find a qualified acupuncturist licensed in your state who has experience treating autoimmune conditions.

This cross-sectional study of 1,087 primary Sjögren's syndrome patients used unsupervised K-means clustering on 10 organ involvement variables to identify distinct clinical phenotypes. Analysis revealed two subtypes: Phenotype 1 (n=594, multi-system inflammatory) characterized by 100% musculoskeletal involvement and markedly elevated RF (246.41±1177.49 vs 32.75±126.74 IU/mL, P<0.001), and Phenotype 2 (n=493, glandular-limited high immunoglobulin) with predominantly glandular manifestations (40.7%) and less systemic involvement. Network analysis demonstrated strong RF-musculoskeletal correlation (r=0.32, P<0.001). Independent predictors of Phenotype 1 included male gender (OR 2.559, 95% CI 1.109-6.090), elevated potassium (OR 1.607), and elevated RF (OR 1.004, 95% CI 1.002-1.005). A composite prediction score achieved AUC 0.717 for phenotype discrimination. Clinical takeaway: RF serves as a key biomarker linking musculoskeletal manifestations with systemic inflammation severity, suggesting the multi-system inflammatory phenotype may particularly benefit from interventions targeting widespread pain and inflammation, including acupuncture protocols for arthralgia and systemic symptoms.