Siddle, H.J., Wilson, M., Nam, J.L. et al. (5 more authors) (2024) A multivariable prediction model to identify anti-CCP positive people in those with non-specific musculoskeletal symptoms in primary care. Rheumatology. keae653. ISSN 1462-0324
Abstract
Objectives We aimed to develop a prediction model identifying people presenting to primary care with musculoskeletal symptoms likely to be anti-CCP positive and therefore at risk of developing RA.
Methods Participants aged ≥16 years, with new-onset non-specific musculoskeletal symptoms and no history of clinical synovitis, completed a symptom questionnaire and had an anti-CCP test. Model development used LASSO-penalized logistic regression, performance was assessed using area under the receiver operating characteristic curve (AUROC) and decision curve analysis, model over-fit was estimated using bootstrapping and cross-validation. Participants were followed-up at 12 months for RA or seronegative/undifferentiated inflammatory arthritis diagnosis.
Results Analysis included 6879 participants; 203 (2.95%) of whom were anti-CCP positive. Eleven predictors were retained: male sex, first-degree relative with RA, ever smoked and joint pain in: back, neck, shoulders, wrists, hands/fingers, thumbs, knees, feet/toes. AUROC was 0.65 (95% CI 0.61, 0.69, optimism = 0.03). Using a 4% decision threshold, the model recommended an anti-CCP test in 1288 (18.7%) participants, 78 (6.1%) of whom were anti-CCP positive, compared with 125/5591 (2.2%) below the threshold. Net benefit was 0.0040 (0.0020 corrected). Forty-eight participants were diagnosed with inflammatory arthritis/RA within 12 months. Of those who were above the threshold and anti-CCP positive, 32.1% developed inflammatory arthritis/RA compared with 0.4% of those who were anti-CCP negative. Of those below the threshold, 0.3% were diagnosed with inflammatory arthritis/RA.
Conclusions Targeted anti-CCP testing in primary care may aid earlier identification of people at risk of RA, prompting specialist referral to rheumatology for earlier diagnosis and initiation of disease-modifying therapy.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © The Author(s) 2024. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License (CC-BY-NC 4.0). |
Keywords: | anti-cyclic citrullinated peptide (anti-CCP) antibodies, at risk of rheumatoid arthritis, inflammatory arthritis, musculoskeletal symptoms, prediction model |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Medicine and Health (Leeds) > School of Medicine (Leeds) > Institute of Rheumatology & Musculoskeletal Medicine (LIRMM) (Leeds) > Inflammatory Arthritis (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 26 Nov 2024 15:21 |
Last Modified: | 10 Jan 2025 15:23 |
Status: | Published online |
Publisher: | Oxford University Press |
Identification Number: | 10.1093/rheumatology/keae653 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:220002 |