XML | Respond to this article | Alert & updates | Request permissions | Email to a friend |
Objective: We explored the characteristics of RA patients who were currently using biologic agents in Ramathibodi Hospital to determine the favorable treatment outcome.
Material and Method: The studied patients were RA patients classified according to ACR/EULAR 2010 criteria and using any biologic agents, between 2010 and 2012. Demographic data and treatment outcome (low disease activity and remission) were retrieved from patient records. Univariate analysis and generalized estimating equation (GEE) were used to analyze predicting factors to control disease at one year. Kaplan-Meier and log rank test were used to analyze time to disease remission or low disease activity.
Results: Patients treated with bDMARDs in Ramathibodi Hospital demonstrated long disease duration (mean 130.7 months) and severe disease activity (mean DAS28 5.37). At 1-year after treatment, 19.4% and 12.9% of patients achieved low disease activity (low DAS) and disease remission, respectively. At 3-years after treatment, 88.9% and 45.2% of patients attained low DAS and remission. Patients who started bDMARDs after 2010 had significantly shorter time to control disease when compared to patients who started bDMARDs before 2010 (10 months vs. 34 months). Moreover, we observed that patient who started bDMARDs after 2010 using more cDMARDs (2.5 vs. 1.7, p = 0.02) and higher dose of methotrexate (10.7 vs. 6.5, p = 0.03). There were no association between disease control status and treatment (methotrexate, prednisolone, biologic agent) or disease duration. However, the exposed status of biologic agent was associated with low DAS or remission at the first year of observation (p = 0.004 and 0.04, respectively).
Conclusion: Chance to control rheumatoid arthritis in the level of remission or low disease activity is predicted by time of bDAMRDs exposure. This result is mainly influenced by dose of methotrexate and number of cDMARDs.
Keywords: Biologic therapy, Efficacy, Rheumatoid arthritis (RA), Registry cohort