Real-world experience with netakimab in the treatment of spondyloarthritis

To study the real-world efficacy and safety of netakimab in the treatment of ankylosing spondylitis (AS) and psoriatic arthritis (PsA). The retrospective analysis included 23 patients (13 males; 56.5%) aged 23 to 73 years (median 42, interquartile range 28 to 52 years) with AS ( =12) or PsA ( =11) who received netakimab therapy from February 2021 to April 2023. Disease activity was assessed every 3-6 months based on the C-reactive protein (CRP) level for all patients according to the BASDAI and ASDAS-CRP indices for AS, DAPSA and PASI for PsA. These indicators were analyzed before therapy and at the last visit to assess the effectiveness of treatment. The results are presented as median (interquartile range). In all patients treated with netakimab (median duration of treatment 11 months), the CRP level decreased from 10.6 (3.1; 17.3) to 3.1 (1.9; 8.9) mg/L (absolute difference -7.5 mg/L, median relative reduction -60%; =0.008), and the proportion of patients with elevated CRP decreased from 70 to 41%; =0.039. In patients with AS (median duration of treatment 9 months), BASDAI score decreased from 5.8 (4.7; 6.5) to 3.0 (1.9; 3.8) points (absolute difference -2.8 points, median relative reduction of -45%; =0.008) and ASDAS-CRP score decreased from 2.8 (1.9; 3.9) to 1.9 (1.7; 2.6) points (absolute difference -0.9 points, median relative reduction -21%; =0.007). The proportion of patients with high AS activity (BASDAI≥4) decreased from 90% to 20% ( =0.031); however, there was no significant change in the CRP level (absolute difference -4.9 mg/L, median relative reduction -57%; =0.110). In patients with PsA (median duration of treatment 18 months), the CRP level decreased from 12.0 (4.5; 17.3) to 3.3 (2.0; 7.8) mg/L (absolute difference -8.7 mg/L, median relative reduction -80%; =0.041), the DAPSA score decreased from 23.0 (19.0; 30.5) to 6.3 (5.2; 13.5) points (absolute difference -16.7 points, median relative reduction -69%; =0.018). Three (13%) patients reported mild to moderate adverse events. The obtained data confirm the effectiveness and safety of netakimab in treating AS and PsA in real-world practice.