Current aim of rheumatoid arthritis (RA) treatment is to achieve remission in as many patients as possible. Rates of remission and clinical outcomes after treatment with abatacept in biologic-naive rheumatoid arthritis (RA) patients with early disease and an inadequate response to methotrexate (MTX) versus patients with ≥ 10 years of disease were assessed.
Data from two trials assessing the efficacy of abatacept in MTX inadequate responders were pooled for this exploratory post hoc analysis. Patients with disease duration of ≤ 2 years at baseline (early disease), originally assigned to an abatacept approximately 10 mg/kg treatment arm and entered into a long-term extension (LTE), were compared with patients with ≥ 10 years of disease (long-standing RA). Remission, DAS28-CRP, ACR 70 responses and the Routine Assessment of Patient Index Data 3 (RAPID3), improvement in physical function as measured by the Health Assessment Questionnaire Disability Index (HAQ-DI).
Twenty-three percent of these patients (n=108) had early disease. A higher percentage of patients with early disease achieved DAS28-CRP remission versus patients with long-standing disease (35.2% vs. 19.4% at year 1, p<0.01; 46.0% vs. 30.9% at year 3, p<0.05). In addition, a higher percentage of the subgroup with early RA achieved ACR70 responses. More patients with early RA had a meaningful improvement in their HAQ-DI (75.2% vs. 60.4%; p<0.05) and RAPID3 scores at one year (mean changes from baseline of -9.6 vs. -8.1; p=0.009).
These data provide additional support for the possible use of abatacept in biologic-naive patients who have had inadequate response to MTX, earlier in their disease course.