To investigate whether early response to tocilizumab (TCZ) and sarilumab (SAR) therapy in patients with active rheumatoid arthritis (RA) is influenced by previous use of biologic agents.
We performed a systematic literature review and a meta-analysis of original studies that analyzed the effectiveness of TCZ or SRL in subgroups of RA patients, including biologic-naïve patients versus those with inadequate response to at least one biologic DMARD (bDMARD), and patients with failure to 1 versus≥2 bDMARDs.
The study selection process finally included 17 articles corresponding to 14 studies, including 7 randomized controlled trials (RCTs). Although the existing literature that compared the response in biologic-naïve patients versus those with inadequate response to at least one bDMARD showed conflicting results, meta-analysis of 6 published studies revealed a significantly higher likelihood of remission (RR=1.3; 95% CI: 1.2-1.5) and low activity disease (RR=1.3; 95% CI: 1.2-1.4) in the biologic-naïve group at week 24. However, differences between groups were not clinically meaningful in all studies and not always maintained after 6 to 12months of treatment. In addition, data from RCT RADIATE and TARGET suggest that the response to IL-6 pathway inhibitors seems to be similar, regardless of the number of tumor necrosis factor inhibitors (TNFis) previously tested.
Disease activity was more rapidly reduced in the early stages of treatment in biologic-naïve patients. However, near similar efficacy can be expected in patients who experienced a failure of at least one bDMARD (mainly TNFis) beyond the first 6 to 12months of treatment, suggesting that the response occurs independently of the number of prior TNFis.