Sjögren's disease & overlap diseases

Sjögren's disease and systemic lupus erythematosus overlap syndrome as distinct entity at crossroads of two autoimmune disorders: clinical characterisation from two Italian reference centres for both the diseases

Clin Exp RheumatolPublished Retrospective comparative cohort study

Authors' conclusion

Our data further highlight the limitations of the application of the current classification criteria in overlap syndrome, since they are primarily based on clinical manifestations and common autoantibodies.

Study context

Population
Patients with SjD-SLE overlap syndrome, Sjögren's disease (SjD) or systemic lupus erythematosus (SLE), two Italian rheumatology centres
Exposure
SjD-SLE overlap syndrome vs SjD only and vs SLE only
Outcome
Clinical, serological, US and histological features, SjD-SLE vs SjD controls
Methodological detailstwo Italian rheumatology reference centres, consecutive patients, comparison with SjD-only and SLE-only controls
  • Two Italian rheumatology reference centres
  • Consecutive patients
  • Comparison with SjD-only and SLE-only controls

Main finding

As reported in the abstract

  • Schirmer's test and parotid swelling comparable between the two groups
  • US changes in the major salivary glands prevalent in SjD controls
  • Histological findings of the minor salivary glands similar
  • SjD-SLE vs SjD controls: P < 0.0001
  • SjD-SLE vs SjD controls: P = 0.0001
  • SjD-SLE vs SjD controls: P = 0.009
  • SjD-SLE vs SjD controls: P < 0.0001
  • SjD-SLE vs SjD controls: P = 0.001
  • SjD-SLE vs SjD controls: P < 0.0001
  • SjD-SLE vs SjD controls: P < 0.0001
  • SjD-SLE vs SjD controls: P = 0.008
  • SjD-SLE vs SjD controls: P = 0.035

Observational data: associations, not effects.

Further findings

OutcomeP value
Clinical and serological features, SjD-SLE vs SLE controlsSjD-SLE vs SLE controls · olderP = 0.044
Clinical and serological features, SjD-SLE vs SLE controlsSjD-SLE vs SLE controls · higher prevalence of anti-SSA and anti-SSBP < 0.0001
Clinical and serological features, SjD-SLE vs SLE controlsSjD-SLE vs SLE controls · C4 reductionP = 0.011
Clinical and serological features, SjD-SLE vs SLE controlsSjD-SLE vs SLE controls · leukopeniaP = 0.025

Clinical and serological features, SjD-SLE vs SLE controls

Frequency of extra-glandular manifestations similar to SLE, including renal involvement

Original publication

Sjögren's disease and systemic lupus erythematosus overlap syndrome as distinct entity at crossroads of two autoimmune disorders: clinical characterisation from two Italian reference centres for both the diseases. Clin Exp Rheumatol. Published 24 September 2024. doi:10.55563/clinexprheumatol/7v6qht

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