Network Meta-analysis of Food and Drug Administration-approved Treatment Options for Adults with Aquaporin-4 Immunoglobulin G-positive Neuromyelitis Optica Spectrum Disorder

Neuromyelitis optica spectrum disorder (NMOSD) is an autoimmune disease defined by attacks on the central nervous system that cause irreversible damage. Recent approval of NMOSD therapies warrants investigations of comparative efficacy to inform treatment decisions. A network meta-analysis (NMA) of all U.S. Food and Drug Administration-approved therapies (eculizumab, inebilizumab, and satralizumab) for adults with aquaporin-4 immunoglobulin G-positive (AQP4+) NMOSD was conducted via a systematic literature review (SLR) using data from randomized controlled trials (RCTs). Database searches of MEDLINE, EMBASE, and the Cochrane Central Register of Controlled Trials were executed for the SLR. A fixed-effects proportional hazards Bayesian NMA was used to estimate relative treatment effects based on data extracted from RCTs identified during the SLR (search end date: 11 September 2020). Four unique RCTs (N-MOmentum, PREVENT, SAkuraSky, and SAkuraStar) were identified, and data from 29 publications were extracted for analysis. Network scenarios describing the most comparable patient population groups (such as by treatment settings) were evaluated in our analyses. Relative treatment effects were evaluated based on time-to-first relapse and were expressed as hazard ratios (HRs) with 95% credible intervals (CrIs). In patients treated with a monoclonal antibody only, eculizumab was associated with a lower risk of relapse compared with satralizumab (HR 0.10, 95% CrI 0.01, 0.65) and inebilizumab (HR 0.11, 95% CrI 0.02, 0.68). In patients treated with monoclonal antibody with or without background immunosuppressive therapy (IST), patients treated with eculizumab ± IST were also less likely to relapse than patients treated with satralizumab ± IST (HR 0.24, 95% CrI 0.06, 0.98). The NMA results suggest that complement component 5 (C5) inhibition prevents NMOSD relapses more effectively than broader mechanisms of action. Neuromyelitis optica spectrum disorder (NMOSD) is an autoimmune disease characterized by inflammation that damages the brain and spinal cord. Many patients with NMOSD produce antibodies against a protein called aquaporin-4 (AQP4+). In the past two years, three drugs (eculizumab, inebilizumab, and satralizumab) have been approved by the U.S. Food and Drug Administration for the treatment of adults with AQP4+ NMOSD. Comparing the efficacy of these three drugs would help physicians make treatment decisions for their patients. In the absence of clinical trials directly comparing these three drugs, we conducted a Bayesian network meta-analysis in order to allow for simultaneous comparisons of these three drugs and estimate relative treatment effects between any pair of interventions in a connected network. With a Bayesian methodology, it is also possible to estimate the probability of being the best treatment out of all other interventions in a connected network. While all three drugs are safe and shown to prevent relapses in placebo-controlled trials, the results of our analysis suggests that eculizumab was the most efficacious in preventing relapses when compared with inebilizumab or satralizumab. These findings may help to inform physicians and their patients when determining the best treatment option for preventing the occurrence of relapses in adults with AQP4+ NMOSD.