Latent Class Trajectory Modeling Of 2-Component Disease Activity Score In 28 Joints Identifies Multiple Rheumatoid Arthritis Phenotypes Of Response To Biologic Disease-Modifying Antirheumatic Drugs

Objective To determine whether using a reweighted disease activity score that better reflects joint synovitis, i.e., the 2-component Disease Activity Score in 28 joints (DAS28) (based on swollen joint count and C-reactive protein level), produces more clinically relevant treatment outcome trajectories compared to the standard 4-componentDAS28. Methods Latent class mixed modeling of response to biologic treatment was applied to 2,991 rheumatoid arthritis (RA) patients in whom treatment with a biologic disease-modifying antirheumatic drug was being initiated within the Biologics in Rheumatoid Arthritis Genetics and Genomics Study Syndicate cohort, using both 4-component and 2-componentDAS28 scores as outcome measures. Patient groups with similar trajectories were compared in terms of pretreatment baseline characteristics (including disability and comorbidities) and follow-up characteristics (including antidrug antibody events, adherence to treatments, and blood drug levels). We compared the trajectories obtained using the 4- and 2-component scores to determine which characteristics were better captured by each. Results Using the 4-componentDAS28, we identified 3 trajectory groups, which is consistent with previous findings. We showed that the 4-componentDAS28 captures information relating to depression. Using the 2-componentDAS28, 7 trajectory groups were identified; among them, distinct groups of nonresponders had a higher incidence of respiratory comorbidities and a higher proportion of antidrug antibody events. We also identified a group of patients for whom the 2-componentDAS28 scores remained relatively low; this group included a high percentage of patients who were nonadherent to treatment. This highlights the utility of both the 4- and 2-componentDAS28 for monitoring different components of disease activity. Conclusion Here we show that the 2-component modifiedDAS28 defines important biologic and clinical phenotypes associated with treatment outcome inRAand characterizes important underlying response mechanisms to biologic drugs.