Abatacept Monotherapy Versus Abatacept Plus Methotrexate for Treatment-Refractory Rheumatoid Arthritis.

Background: Methotrexate combination therapy improves abatacept efficacy as a first-line biologic agent for the treatment of rheumatoid arthritis, but it is unclear when abatacept is used later on, particularly after non-TNF inhibitor (TNFi) failure.
Study Question: The objective of this study was to determine whether treatment response after non-TNFi inadequate response is different in patients with rheumatoid arthritis (RA) treated with abatacept in combination with or not with methotrexate.
Methods: Patients treated with abatacept monotherapy or in combination with methotrexate after non-TNFi failure were included.
Results: Data from 46 patients aged 56 years [49-61] with 12 years [8-16] of disease duration were examined. Rituximab was the treatment used in the previous line for 75.0% of the combination therapy group (15/20) and 34.6% (9/26) in the monotherapy group. At 12 months, 38.5% (10/26) of patients were in good-to-moderate EULAR response in the monotherapy group compared with 25.0% (5/20) in the combination therapy group (P = 0.33). Treatment persistence at 12 months was 61.5% (16/26) in the monotherapy group and 35.0% (7/20) in the combination therapy group (P = 0.07).
Conclusions: Adding methotrexate to abatacept did not improve treatment response in patients with RA after non-TNFi inadequate response.