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Updated: Jun 22, 2026

Using Reference Reagents to Confirm Robustness of Cytokine Release Assays for the Prediction of Monoclonal Antibody Safety
Published on: September 15, 2023
Third generation anti-cyclic citrullinated peptide antibodies do not predict anti-TNF-alpha treatment response in
Christian Dejaco1, Christina Duftner, Werner Klotz
1Department of Internal Medicine, General Hospital of the Elisabethinen, Voelkermarkterstrasse 15-19, Klagenfurt, Austria. christian.dejaco@ekh.at
Abstract:
Objective of this study is to retrospectively compare the third generation anti-cyclic citrullinated peptide (anti-CCP3) test with the second generation (anti-CCP2) assay as markers of disease activity and predictors of clinical response in rheumatoid arthritis (RA) patients treated with TNF-alpha blocking agents. This study was performed in 42 RA patients treated either with infliximab (n = 11), etanercept (n = 7) or adalimumab (n = 24). Serum anti-CCP3 and anti-CCP2 levels were tested before and 6 months after starting a TNF-alpha blocking treatment using commercially available ELISA kits. Anti-CCP3 and anti-CCP2 antibody levels did not significantly change after 6 months of TNF-alpha blocking treatment. Furthermore, neither anti-CCP3 nor anti-CCP2 was useful to predict anti-TNF-alpha treatment response using receiving operating characteristic curve and logistic regression analyses. Both anti-CCP3 and anti-CCP2 are not differentially influenced by TNF-alpha blocking agents in RA patients and failed to predict anti-TNF-alpha treatment response.
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