RA-BEACON. Investigators looked at 527 randomized patients who had failed treatment with a biologic DMARD with nearly half failing multiple classes of this drug. The primary endpoint for this study was met, with the 4-mg dose showing superior results, compared with placebo, based on American College of Rheumatology (ACR) 20 scores (P less than .0001). As early as week 1 of the trial, both patients receiving 2 mg and those receiving 4 mg of baricitinib showed significant improvement, compared with placebo. By week 4, the 4-mg dose produced as much improvement as the 2-mg dose achieved over nearly 6 months. While the 4-mg dose was considered more effective, the 2-mg dose showed improvement in ACR 20 scores, change in Disease Activity Score 28 C-reactive protein (DAS28-CRP), and change in health assessment questionnaire disability index (HAQ-DI) (P less than .001). Neither the 4-mg nor the 2-mg dose was able to reduce Simple Disease Activity Index (SDAI) scores, a difficult endpoint to achieve, particularly in such a short time frame.
RA-BUILD. The researchers looked at patients who had failed treatment with conventional DMARDs and had not been treated with biologic DMARDS. The investigators looked at 684 randomized patients and saw similar results to RA-BEACON, with both the 2-mg and 4-mg doses displaying significant improvement in ACR 20, change in DAS28-CRP, and change in HAQ-DI, as well as SDAI remission which had been absent in RA-BEACON. Patients taking the 4-mg dose showed improvement in morning joint stiffness duration and severity (P less than .0001), as well as improvements in worst joint pain (P less than .0001) and tiredness (P less than .027).
RA-BEGIN. The investigators took a different approach and compared various drug combinations, including baricitinib 4 mg alone or in combination with oral methotrexate or in patients taking methotrexate who were DMARD-naive. Ultimately, this trial displayed that baricitinib 4 mg alone was superior to methotrexate, according to ACR 20 scores. This held true across all clinical measures at week 24 whether baricitinib was administered alone or in combination with methotrexate. As it had in the previously discussed trials, the 4-mg dose improved all of the previously mentioned test scores, compared with methotrexate (P less than .0001) except for modified Total Sharp Score (mTSS) (P = 0.158). When baricitinib 4 mg was used in conjunction with methotrexate, improvements in test scores, including mTSS, were statistically significant.
RA-BEAM. The researchers compared baricitinib 4 mg with placebo and adalimumab in 1,305 patients. All patients maintained a background level of methotrexate to improve the efficacy of adalimumab. Consistent with previous studies, baricitinib 4 mg outperformed other therapies and placebo in improvement in ACR 20, change in DAS28-CRP, change in HAQ-DI, and SDAI remission, as well as improvements in morning joint stiffness duration and severity, worst joint pain, and worst tiredness (P less than .0001).