Objectives: The objective of this study is to compare the effectiveness of biological disease-modifying antirheumatic drugs (bDMARDs) by analyzing claims data of 13 Japanese national university hospitals.
Methods: We evaluated 4970 cases of rheumatoid arthritis treated with bDMARDs from the Clinical Information Statistical Analysis database, which has collected and integrated 13 Japanese national university hospitals' claims data for 10 years. We surveyed the medications and calculated the retention rates of bDMARDs using the Kaplan-Meier method and differentiated the effectiveness between the two bDMARDs by comparing the retention rates after switching from one drug to another.
Results: Of the 4970 cases, 1364 switched bDMARDs at least once. Tocilizumab (TCZ) reported the highest retention rate, whereas abatacept (ABT) revealed a similar rate compared with only naïve cases. The retention rate curves were higher in cases on TCZ that switched from the other bDMARDs than those in the reversed cases. Following TCZ, ABT and etanercept indicated better results than the other bDMARDs.
Conclusion: We could compare the effectiveness among bDMARDs by differentiating the retention rates from big claims data. TCZ reported higher retention rates in both naïve and switched cases than other bDMARDs.
Keywords: Biological disease-modifying antirheumatic drugs (bDMARDs); claims data; real-world data; retention rate.