Vinod Chandran, MBBS, MD, DM, PhD
Recent publications on psoriatic arthritis (PsA) have focused on targeted therapies, particularly those targeting interleukin (IL) 17 and 23. Bimekizumab is a novel biologic that dually inhibits IL-17A and IL-17F. Coates and colleagues reported 3-year results from the phase 2b BE ACTIVE trial that included 206 adults with active PsA randomly assigned to receive bimekizumab or placebo for 48 weeks, of which 184 patients were enrolled in the open-label extension phase for a further 104 weeks of treatment. They report that at least 20% improvement in American College of Rheumatology score was maintained by 64.1% of patients at week 152 compared with 72.3% of patients at week 48. By week 152, 89.3% of patients had reported one or more treatment-emergent adverse event (TEAE), with serious TEAE being reported by 10.7% of patients. Fungal infections are of special interest when inhibiting both IL-17A and IL-17F. It was observed that 9.7% had fungal infections (all mild-to-moderate and localized), of which 4.6% had candidiasis. Thus, bimekizumab shows promise as a new therapy for PsA.
In addition to improving signs and symptoms, clinically meaningful improvement in health-related quality of life is an important goal of treatment. Two studies reported improvement in patient reported outcomes on treatment with IL-23 inhibitors.
An analysis of data from the phase 3 DISCOVER 2 trial included 738 biologic-naive patients with active PsA and inadequate response to standard treatments. These patients were randomly assigned to receive 100 mg guselkumab every 4 weeks (Q4W) or every 8 weeks (Q8W) or placebo. Curtis and colleagues showed that a significantly higher proportion of patients receiving guselkumab Q4W/Q8W vs placebo reported achieving minimally important differences (MID) in the EuroQol 5-Dimension 5-Level (EQ-5D-5L) Index (56.0%/56.0% vs 43.4%; P < .006) and Visual Analog Scale (EQ-VAS) score (62.8%/63.5% vs 44.4%; P < .0001) at week 24, with more than 60% of patients reporting improvements at week 52.
Similarly, analyses of data by Kristensen and colleagues from two phase 3 trials, KEEPsAKE-1 and KEEPsAKE-2, included adults with PsA and inadequate response/intolerance to disease-modifying antirheumatic drugs or biologics. The patients were randomly assigned to receive risankizumab or placebo for 24 weeks and only risankizumab during weeks 24-52. At week 24, patients receiving risankizumab vs placebo were significantly more likely to report achieving MID in Patient's Global Assessment of Disease Activity (PtGA) in both KEEPsAKE-1 (odds ratio [OR] 2.0; P < .001) and KEEPsAKE-2 (OR 1.9; P < .01) studies, with further improvement at week 52. Improvement was also seen on the Patient's Assessment of Pain, Health Assessment Questionnaire – Disability Index, Short-Form 36 Physical and Mental Component Summary scores, EQ-5D-5L, Functional Assessment of Chronic Illness Therapy – Fatigue, and Work Productivity and Activity Impairment.
An interesting insight from two studies showed the importance of nail disease in predicting treatment response. A post hoc analysis by Helliwell and colleagues of the phase 3 SEAM-PsA trial of 851 biologic/methotrexate-naive patients with active PsA who were randomly assigned to receive methotrexate monotherapy, etanercept monotherapy, or methotrexate + etanercept combination therapy showed that the presence of both dactylitis and nail disease at baseline were significantly associated with the achievement of minimal disease activity (OR 1.4; P = .0457; and OR 1.8; P = .0233, respectively), as well as low PsA Disease Activity Score (OR 1.8; P = .0014; and OR 1.8; P = .0168, respectively).
Similarly, a post hoc analysis by Baraliakos and colleagues of the phase 3b MAXIMISE trial of 473 adult patients with PsA and axial manifestations who were randomly assigned to receive secukinumab (150 or 300 mg) or placebo showed that the presence vs the absence of nail dystrophy was associated with the achievement of significantly better Assessment of SpondyloArthritis International Society 20 response in the 300 mg secukinumab group (OR 5.0; 95% CI 1.47-17.19).