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Antiphospholipid Antibody Profile Stability Over Time: Prospective Results from APS ACTION Clinical Database and Repository

Gkrouzman, E; Sevim, E; Finik, J; Andrade, D; Pengo, V; Sciascia, S; Tektonidou, MG; ... APS ACTION+; + view all (2021) Antiphospholipid Antibody Profile Stability Over Time: Prospective Results from APS ACTION Clinical Database and Repository. Journal of Rheumatology , 48 (4) pp. 541-547. 10.3899/jrheum.200513. Green open access

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Abstract

Objective: APS ACTION Registry studies long-term outcomes in persistently antiphospholipid antibody (aPL)-positive patients. Our primary objective was to determine whether clinically meaningful aPL profiles at baseline remain stable over time. Our secondary objectives were to determine a) whether baseline characteristics differ between patients with stable and unstable aPL profiles, and b) predictors of unstable aPL profiles over time. / Methods: Clinically meaningful aPL profile was defined as positive lupus anticoagulant (LA) test and/or anticardiolipin (aCL)/anti-β2 glycoprotein-I (aβ2GPI) IgG/M ≥40 U. Stable aPL profile was defined as a clinically meaningful aPL profile in at least two-thirds of follow-up measurements. Generalized linear mixed models with logit link were used for primary objective analysis. / Results: Of 472 patients with clinically meaningful aPL profile at baseline (median follow up: 5.1 years), 366/472 (78%) patients had stable aPL profiles over time, 54 (11%) unstable; and 52 (11%) inconclusive. Time did not significantly affect odds of maintaining a clinically meaningful aPL profile at follow-up in univariate (p=0.906) and multivariable analysis (p=0.790). Baseline triple aPL positivity decreased (Odds Ratio [OR] 0.25, 95% Confidence Interval [CI] 0.10-0.64, p=0.004) and isolated LA test positivity increased (OR 3.3, 95% CI 1.53-7.13, p=0.002) the odds of an unstable aPL profile over time. / Conclusion: Approximately 80% of our international cohort patients with clinically meaningful aPL profile at baseline maintain such at a median follow-up of five years; triple aPL-positivity increase the odds of a stable aPL profile. These results will guide future validation studies of stored blood samples through APS ACTION Core Laboratories.

Type: Article
Title: Antiphospholipid Antibody Profile Stability Over Time: Prospective Results from APS ACTION Clinical Database and Repository
Location: Canada
Open access status: An open access version is available from UCL Discovery
DOI: 10.3899/jrheum.200513
Publisher version: https://doi.org/10.3899/jrheum.200513
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Cancer Institute
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Cancer Institute > Research Department of Haematology
URI: https://discovery.ucl.ac.uk/id/eprint/10117483
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