Patterns of Prednisone Use in Patients with Rheumatoid Arthritis Initiating Treatment with Tocilizumab in Routine US Clinical Practice

Introduction Prednisone is frequently administered in combination with other therapies for the treatment of rheumatoid arthritis (RA); however, its chronic use is associated with an increased risk of comorbidities and mortality. The objective of this analysis was to evaluate changes in prednisone use among patients with RA treated with tocilizumab (TCZ) in routine US clinical practice. Methods TCZ-naive patients in the Corrona RA registry who initiated TCZ were included. The primary outcome was the proportion of patients with changes in prednisone use over 12 months (primary analysis) and 6 months (secondary analysis). Changes in disease activity over 6 and 12 months (+/- 3 months) were assessed using the Clinical Disease Activity Index (CDAI). Outcomes were assessed in the overall population and separately for patients receiving TCZ monotherapy or in combination with conventional synthetic disease-modifying antirheumatic drugs. Results Of patients receiving prednisone at baseline (mean [SD] dose: 7.7 [5.2] mg/day), 30.6% discontinued prednisone over 12 months; among patients receiving > 7.5 mg of prednisone at the time of TCZ initiation, 63.0% discontinued prednisone or decreased their dose by >= 5 mg over 12 months. In secondary analyses, 29.7% of patients receiving prednisone at baseline had discontinued prednisone over 6 months; among those receiving > 7.5 mg of prednisone at baseline, 51.3% discontinued or decreased their dose by >= 5 mg over 6 months. Changes in prednisone use and improvement from baseline in CDAI score over 6 and 12 months were comparable between patients who initiated TCZ monotherapy vs. TCZ combination therapy. Conclusions In this real-world analysis, many patients initiating TCZ monotherapy or combination therapy were able to discontinue or decrease their prednisone dose over 12 months. Similar changes in prednisone dose were observed over 6 months. Funding Corrona, LLC and Genentech, Inc. Plain Language Summary Plain language summary available for this article. Plain Language Summary Rheumatoid arthritis (RA) is a chronic autoimmune disease that can lead to joint damage and disability. The steroid prednisone is a fast-acting and effective treatment for RA and is often prescribed alongside disease-modifying antirheumatic drugs (DMARDs). The health risks associated with the long-term use of prednisone have led to recommendations to minimize prednisone dose and duration of treatment. Few studies have examined the extent to which biologic DMARDs allow rheumatologists to reduce or discontinue the use of prednisone. The objective of this study was to evaluate changes in prednisone dose while receiving tocilizumab (TCZ) in patients with RA seen in routine US clinical practice. Patients who were enrolled in the Corrona RA registry and were beginning treatment with TCZ were included. Changes in prednisone use were evaluated 12 months after starting treatment. Of patients receiving prednisone at study initiation, 30.6% had discontinued prednisone over 12 months; among patients receiving > 7.5 mg of prednisone at the time of TCZ initiation, 63.0% discontinued prednisone or decreased the dose by >= 5 mg over 12 months. In secondary analyses, 29.7% of patients receiving prednisone at study initiation had discontinued prednisone over 6 months; among those receiving > 7.5 mg of prednisone at baseline, 51.3% discontinued or decreased the dose by >= 5 mg over 6 months. Changes in prednisone use and improvement in disease activity over 6 and 12 months were comparable between patients who initiated TCZ monotherapy or combination therapy with other DMARDs.