Evaluation of Newly Proposed Remission Cut-points for Disease Activity Score in 28 Joints (DAS28) in Rheumatoid Arthritis Patients upon IL-6 Pathway Inhibition

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Evaluation of Newly Proposed Remission Cut-points for Disease Activity Score in 28 Joints (DAS28) in Rheumatoid Arthritis Patients upon IL-6 Pathway Inhibition
Key Take-Away: 

With emerging advanced therapies, assessment of rheumatoid arthritis (RA) becomes very easy. Out of various disease activity-scoring systems, Disease Activity Score (DAS) is widely used in determining specific cut-points. This study explains various stringent cut-points used during DAS assessment.

Stringent remission criteria are crucial in rheumatoid arthritis (RA) assessment. Disease activity score in 28 joints (DAS28)-remission has not been included among American College of Rheumatology/European League Against Rheumatism definitions, because of its association with significant residual disease activity, partly due to high weighting of acute-phase reactants (APR). 

ABSTRACT: 
Background: 

Stringent remission criteria are crucial in rheumatoid arthritis (RA) assessment. Disease activity score in 28 joints (DAS28)-remission has not been included among American College of Rheumatology/European League Against Rheumatism definitions, because of its association with significant residual disease activity, partly due to high weighting of acute-phase reactants (APR).

New, more stringent cut-points for DAS28-remission have recently been proposed that are suggested to reflect remission by clinical and simplified disease activity indices (clinical disease activity index (CDAI), simple disease activity index (SDAI)). However, their stringency in therapies directly influencing APR, like IL-6-blockers, has not been tested. We tested the new cut-points in patients with RA receiving tocilizumab.

 

Methods: 

The data from randomized controlled trials of tocilizumab and evaluated patients in remission according to new DAS28-C-reactive protein (DAS-CRP) and DAS-erythrocyte sedimentation rate (DAS-ESR) cut-points (1.9 and 2.2) was used for the study.

Their disease activity state was assessed using the CDAI, SDAI, and Boolean criteria and analyzed their individual residual core set variables, like swollen joint counts (SJC28).

Results: 

About 50% of patients in DAS28-CRP-remission (<1.9) fell into higher disease activity states when assessed with CDAI, SDAI or Boolean criteria.

Also, 15% had three or more (up to eight) SJC. Even higher disease activity was seen in patients classified as being in DAS28-ESR-remission (<2.2).

Conclusion: 

Even with new, more stringent cut-points, DAS28-remission is frequently associated with considerable residual clinical disease activity, indicating that this limitation of the DAS28 is related to score construction rather than the choice of cut-points.

 

Source:

Arthritis Research & Therapy

Link to the source:

https://arthritis-research.biomedcentral.com/articles/10.1186/s13075-017-1346-5

The original title of the article:

Evaluation of newly proposed remission cut-points for disease activity score in 28 joints (DAS28) in rheumatoid arthritis patients upon IL-6 pathway inhibition

Authors:

M.Schoels et al.

Diagnostic, Tocilizumab, Rheumatoid Arthritis, Joints, Immunosuppressant, CDAI, SDAI, Boolean criteria
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