Details of ARCTIC REWIND
The open-label ARCTIC REWIND trial enrolled patients with RA in sustained remission, determined via Disease Activity Score (DAS), from 10 different hospitals in Norway. Researchers enrolled 160 patients in the csDMARD-only arms and randomized them to receive stable dose csDMARDs for 3 years or half-dose csDMARDs for 1 year, followed by complete withdrawal for the next 2 years; withdrawal of csDMARDs was only done in patients who had not had a flare during the first year. Participants had scheduled clinic visits every 4 months, and full-dose csDMARD therapy was resumed in patients who experienced disease flares.
There was a total of 99 patients randomized in the TNF-inhibitor arms to continue stable TNF-inhibitor therapy or to taper to a half dose for 4 months before discontinuing therapy. Like the csDMARD study, clinic visits occurred every 4 months, and full-dose therapy was resumed if a flare occurred. Patients taking a TNF inhibitor could also take a csDMARD as needed.
Last year, 1-year results for the csDMARD arms were published in JAMA, and 1-year results for the TNF-inhibitor arms were reported in Annals of the Rheumatic Diseases.
At baseline, most patients across the three csDMARD groups (81%) had received methotrexate monotherapy. Triple therapy (methotrexate, sulfasalazine, and hydroxychloroquine) was used in 13% of the stable-dose group, 7% of the half-dose group, and 8% of the half-dose tapering to withdrawal group. Seven individuals in the stable-dose group, three individuals in the half-dose group, and three individuals the half-dose tapering to withdrawal group used other mono/duo therapies.
A total of 139 participants in the csDMARD-only arms completed 3 years of follow-up, with 68 in the stable-dose group, 36 in the half-dose group, and 35 in the half-dose tapering to withdrawal group.
Compared with the stable-dose group, the risk for flare was more than four times higher in the half-dose tapering to withdrawal group (hazard ratio [HR], 4.2; 95% CI, 2.2-8.2) and about three times higher in the half-dose group (HR, 2.9; 95% CI, 1.5-5.9). The flare risk between the half dose and half-dose tapering to withdrawal group was not statistically significant.
Most patients regained DAS remission status in the next clinic visit following a flare, the authors reported. Comparing the last visit to baseline, 10 patients in the taper-to-withdrawal group (27%) had increased treatment — either by adding a biologic or increasing csDMARD dose — compared with one patient (3%) in the half-dose group and 11 patients (14%) in the stable-dose group. Adverse events were common across all three groups, though were highest in the tapering to withdrawal group.
In the TNF-inhibitor arms, a total of 80 patients completed the 3-year follow-up. By the end of 3 years, 75% of the tapering group experienced a disease flare compared with 15% of the stable TNF-inhibitor group. Most patients regained DAS remission status in the next clinic visit following a flare, the authors reported. During the study, 23% of the tapering group and 13% of the stable TNF-inhibitor group used systemic glucocorticoids. Four patients in the tapering group and two patients in the stable TNF-inhibitor group switched to another TNF inhibitor during the study. An additional two patients in the stable TNF-inhibitor group switched to a Janus kinase inhibitor during the 3-year study.
Adverse events were similar in both treatment groups, but serious adverse events were more common in the tapering group (21%) than in the stable-dose group (11%).
The authors concluded that the findings did not support tapering a TNF inhibitor to withdrawal for patients in sustained remission, but they noted that additional research is needed to identify which patients would fare better or worse tapering csDMARDs.
ARCTIC REWIND was funded by grants from The Research Council of Norway and The South-Eastern Norway Regional Health Authorities. Many of the authors disclosed financial ties to pharmaceutical companies. Dr. O’Dell disclosed no relevant financial relationships.
A version of this article appeared on Medscape.com.