In patients with RA whose disease is well controlled by methotrexate combined with etanercept, withdrawal of methotrexate led to long-term outcomes that were nearly as good as continuation of combination therapy. The finding comes from the randomized, controlled SEAM-RA trial that sought to address weaknesses of previous studies. It included a long lead-in time with stringent criteria to ensure that participants had very good disease control.
Courtesy University of Alabama at Birmingham
Dr. Jeffrey R. Curtis
Both the American College of Rheumatology and the European League Against Rheumatism recommend tapering medication in RA patients who are in long-term remission, but there is no established optimal strategy.
“There have been some prior RA trials that have looked at therapy reduction or withdrawal, but most did not use a very stringent definition of how well people were when they began. Were they in remission, or only in low disease activity?” said Jeffrey R. Curtis, MD , during a presentation of the results at the virtual annual meeting of the ACR. The study was also published online Nov. 18 in Arthritis & Rheumatology .
Stringent remission criteria
The key feature of the trial was the 6-month run-in period, when subjects were taking 50 mg etanercept once per week and 10-25 mg of oral methotrexate once per week, and had to complete at least three visits. They were excluded from the ensuing randomization if they had a Simplified Disease Activity Index (SDAI) score >3.3 and ≤11 at two or more visits, had an SDAI >11 at any time during the run-in period, or had an SDAI >3.3 at the third run-in visit.
“We [wanted them] to be doing quite well for a long period of time. That was empirically confirmed under observation as part of the lead-in period, and even before that, the clinical investigator had to affirm that they believed the patient was doing well for 6 or more months even before they were screened to enter the trial,” said Dr. Curtis, professor of medicine in the division of clinical immunology and rheumatology at the University of Alabama at Birmingham.
Once enrolled in the trial, patients were randomized 2:2:1 to continuing etanercept only (n = 101), continuing methotrexate only (n = 101), or continuing both medications (n = 51). Patients were eligible for rescue after randomization if they had an SDAI score >11 at any time, SDAI between 3.3 and 11 on three separate visits, or between 3.3 and 11 at two consecutive visits at least 2 weeks apart. About three-quarters of patients in each treatment arm were female, with a mean age of about 55 years, and 82%-91% were White.
Good remission recovery with rescue therapy
At week 48, 28.7% of the methotrexate-only group were in remission (SDAI ≤3.3), compared with 49.5% of the etanercept-only group ( P = .004) and 52.9% of the combination group ( P = .006). Time to disease worsening was shorter in the methotrexate-only group (median, 198 days) than in the etanercept-only group (median, not estimable; P < .001) and the combined therapy group (median, not estimable; P < .001).