Key clinical point : Continued ixekizumab (IXE) therapy was superior to IXE withdrawal in maintaining minimal disease activity (MDA) in biologic-naive patients with psoriatic arthritis (PsA). In case of treatment interruption, re-treatment with IXE following relapse may restore disease control.
Major finding: Patients relapsed more rapidly with IXE withdrawal (median, 22.3 weeks) vs. continued IXE treatment (median was not estimable because less than 50% of patients had relapsed by the end of study period; P less than .0001). The cumulative relapse rate from week 24 to week 104 was higher for the withdrawal vs. continued treatment group (85% vs. 38%; P less than .0001). Median time to re-achieving MDA on retreatment was 4.1 weeks; 64 (95.5%) of 67 patients who relapsed with treatment withdrawal re-achieved MDA on retreatment.
Study details: SPIRIT-P3 was a multicenter, randomized, double-blind withdrawal study of 394 biologic-naive patients with PsA who received open-label IXE (160 mg at week 0, 80 mg every 2 weeks) for 36 weeks. Between weeks 36 and 64, 158 patients who achieved sustained MDA (greater than 3 months) were randomized (1:1) to continue on 80 mg IXE every 2 weeks or placebo until week 104.
Disclosures: This study was funded by Eli Lilly and Company. Some study investigators reported owning stock in, being an employee of, receiving support from, and/or consulting for Eli Lilly and Company.
Source: Coates LC et al. Arthritis Rheumatol. 2021 Mar 7. doi: 10.1002/art.41716 .